JP7094026B2 - Bubble forming device - Google Patents

Description

The present invention relates to a bubble forming apparatus .

Patent Document 1 discloses a bubble forming device that obtains a gas-liquid mixed fluid in which bubbles are dispersed in a liquid by using a tank. In this device, first, the gas and the liquid are pressurized in the tank to dissolve the gas in the liquid in the tank. Next, by increasing the pressure in the tank to atmospheric pressure, the gas dissolved in the liquid appears as bubbles in the liquid.

Patent Document 2 discloses a bubble forming device that obtains a gas-liquid mixed fluid in which bubbles are dispersed in a liquid by using a porous member. This device forms a gas-liquid mixed fluid in which bubbles are dispersed in the liquid by ejecting a gas into the liquid through a porous member, and discharges the formed gas-liquid mixed fluid to the outside through a tubular discharge portion.

Japanese Unexamined Patent Publication No. 11-207162 Japanese Patent Application Laid-Open No. 2003-265939

The bubble forming device of Patent Document 1 uses a pressure regulating valve to alternately pressurize the tank and release it to the atmospheric pressure, and when the pressure in the tank is increased to the atmospheric pressure, the air or liquid from the tank. Discharge the mixed fluid. Therefore, during the period of pressurizing the tank, the discharge of the gas-liquid mixed fluid is interrupted, and the gas-liquid mixed fluid cannot be continuously obtained.

The bubble forming apparatus of Patent Document 2 can continuously discharge the gas-liquid mixed fluid from the discharge portion, but there is room for improvement in the miniaturization of the bubbles contained in the gas-liquid mixed fluid. Patent Document 2 does not disclose any specific configuration of the emission unit, and it cannot be said that the emission unit substantially exerts an action of miniaturizing bubbles.

An object of the present invention is to provide a bubble forming apparatus capable of continuously obtaining a gas-liquid mixed fluid containing bubbles finely divided by dissolution.

In order to achieve the above object, the bubble forming apparatus according to the present invention is
A discharge unit that forms a gas-liquid mixed fluid containing a liquid and bubbles dispersed in the liquid and discharges the formed gas-liquid mixed fluid.
A tubular body having both ends open, and the gas-liquid mixed fluid discharged by the discharging portion is introduced from one end and the introduced gas-liquid mixed fluid is guided to the other end. And ,
A temperature adjusting means for adjusting the temperature of the gas-liquid mixed fluid via the bubble miniaturization tubular body, and
Equipped with
The temperature adjusting means
A constant temperature liquid tank that stores the temperature control liquid,
A temperature regulator that keeps the temperature adjusting liquid in the constant temperature liquid tank at a predetermined temperature, and
Have,
The tubular body for bubble miniaturization
The centrifugal force that forms a Dean vortex in the gas-liquid mixed fluid is wound a plurality of times in a coil shape so as to act on the gas-liquid mixed fluid, and is immersed in the temperature adjusting liquid in the constant temperature liquid tank. Coiled part,
Have,
The cross-sectional area of the portion of the bubble miniaturization tubular body having an inner diameter of 5 [mm] or less and through which the gas-liquid mixed fluid flows is set to X in the flow path of the gas-liquid mixed fluid. When the path length of the bubble micronization tubular body along the line is Y, the length scale defined by Y / X is 500 [1 / mm] or more.
The discharge portion forms a flow of the gas-liquid mixed fluid having a Reynolds number of 3000 or more inside the bubble miniaturization tubular body, and the internal pressure of the bubble miniaturization tubular body is higher than the atmospheric pressure. The gas-liquid mixed fluid was introduced into the one end of the bubble micronization tubular body under the condition of being increased to a value of 0.3 [MPa] or less .
During the period in which the gas-liquid mixed fluid flows through the bubble miniaturization tubular body, the dissolution of the bubbles into the liquid by the internal pressure proceeds, so that the average diameter of the bubbles in the bubble miniaturization tubular body is increased. Miniaturized to 1/10 or less,
From the other end of the bubble miniaturization tubular body, the gas-liquid mixed fluid having the average diameter of the bubbles of 100 [nm] or less and the density of the bubbles of 3.7 [100 million cells / mL] or more. Is obtained .

A plurality of the above-mentioned tubular bodies for bubble miniaturization are provided.
A plurality of the bubble miniaturization tubular bodies are connected to the discharge portion so that the gas-liquid mixing fluid discharged from the discharge portion flows in parallel with the plurality of the bubble miniaturization tubular bodies. May be good.

The discharge part
It may have a configuration in which the flow rates of the liquid constituting the gas-liquid mixed fluid and the gas constituting the bubbles of the gas-liquid mixed fluid can be adjusted independently.

According to the present invention, in the period from the introduction of the gas-liquid mixed fluid into the bubble miniaturization tubular body to the time when the gas-liquid mixed fluid is derived from the bubble miniaturization tubular body, the bubble miniaturization tubular body becomes a liquid of bubbles. Dissolution progresses. Therefore, a gas-liquid mixed fluid containing bubbles finely divided by dissolution can be continuously obtained.

The conceptual diagram which shows the structure of the bubble formation apparatus which concerns on Embodiment 1. FIG. 3 is a cross-sectional view parallel to the path length direction of the tubular body for bubble miniaturization according to the first embodiment. FIG. 3 is a cross-sectional view perpendicular to the path length direction of the tubular body for bubble miniaturization according to the first embodiment. The conceptual diagram which shows the structure of the bubble formation apparatus which concerns on Embodiment 2. The conceptual diagram which shows the structure of the bubble formation apparatus which concerns on Embodiment 3. The graph which shows the frequency distribution by the diameter of the bubble in the gas-liquid mixed fluid obtained in Example 1. FIG. The graph which shows the frequency distribution by the diameter of the bubble in the gas-liquid mixed fluid obtained in Example 2. FIG. The graph which shows the frequency distribution by the diameter of the bubble in the gas-liquid mixed fluid obtained in Example 3. FIG. The graph which shows the frequency distribution by the diameter of the bubble in the gas-liquid mixed fluid obtained in Example 4.

Hereinafter, the bubble forming apparatus according to the embodiment will be described with reference to the drawings. In the figure, the same or corresponding parts are designated by the same reference numerals.

[Embodiment 1]
As shown in FIG. 1, the bubble forming apparatus 400 according to the present embodiment is discharged by a discharge unit 100 that discharges a gas-liquid mixed fluid FL containing a liquid and bubbles dispersed in the liquid, and a discharge unit 100. A tubular body 200 for atomizing bubbles through which a gas-liquid mixed fluid FL is passed is provided.

The bubble miniaturization tubular body 200 has a tubular shape with both ends open. The gas-liquid mixed fluid FL discharged by the discharge unit 100 is introduced from one end 201 of the bubble miniaturization tubular body 200. The bubble miniaturization tubular body 200 guides the gas-liquid mixed fluid FL introduced from one end 201 to the other end 202 and continuously discharges the gas-liquid mixed fluid FL from the other end 202.

Further, the bubble miniaturization tubular body 200 has a coil-shaped portion 203 having a shape of being wound a plurality of times in a coil shape between one end 201 and the other end 202. The significance of the coiled portion 203 will be described later.

The discharge unit 100 includes a gas-liquid mixing chamber 10 made of an airtight and liquid-tight container communicating with one end 201 of the bubble miniaturization tubular body 200, a porous member 20 arranged in the gas-liquid mixing chamber 10, and a porous body. It has a gas pump 30 that supplies gas into the gas-liquid mixing chamber 10 through the quality member 20, and a liquid pump 40 that supplies liquid to the gas-liquid mixing chamber 10.

The liquid pump 40 is connected to the gas-liquid mixing chamber 10 by a pipe 51. The liquid pump 40 takes in the liquid from the liquid source LS and discharges the taken-in liquid into the gas-liquid mixing chamber 10 through the pipe 51. As a result, the gas-liquid mixing chamber 10 is filled with the liquid.

On the other hand, the gas pump 30 is connected to the porous member 20 by a pipe 52. The gas pump 30 takes in gas from the gas source GS and discharges the taken-in gas into the gas-liquid mixing chamber 10 through the pipe 52 and the porous member 20.

The porous member 20 is immersed in a liquid in the gas-liquid mixing chamber 10. The porous member 20 has a porous structure in which a large number of fine ventilation holes are formed, and the gas supplied from the gas pump 30 is bubbled in the porous structure and discharged into the liquid. As a result, in the gas-liquid mixing chamber 10, a gas-liquid mixing fluid FL in which bubbles are dispersed in the liquid is formed.

Specifically, the porous member 20 is made of a porous membrane. However, the porous member 20 is not limited to the porous membrane, and for example, a metal or ceramic sintered body may be used as the porous member 20.

Further, the discharge unit 100 has a configuration in which the flow rates of the liquid constituting the gas-liquid mixed fluid FL and the gas constituting the bubbles of the gas-liquid mixed fluid FL can be independently adjusted. Specifically, the pipe 51 is provided with a valve 61, and the flow rate of the liquid can be adjusted by the valve 61. Further, the pipe 52 is also provided with a valve 62, and the flow rate of the gas can be adjusted by the valve 62.

Further, the pipe 51 is provided with a pressure gauge 71 for measuring the internal pressure of the pipe 51. The pipe 52 is provided with a pressure gauge 72 for measuring the internal pressure of the pipe 52. The user can confirm the flow rate of the liquid by the measurement result of the pressure gauge 71, and can confirm the flow rate of the gas by the measurement result of the pressure gauge 72.

Further, the gas-liquid mixing chamber 10 is also provided with a pressure gauge 73 for measuring the internal pressure of the gas-liquid mixing chamber 10. The user can confirm the pressure at which the gas-liquid mixed fluid FL is discharged from the discharge unit 100 to the bubble miniaturization tubular body 200 by the measurement result of the pressure gauge 73. The user can adjust the pressure indicated by the pressure gauge 73 to a desired value by using the valves 61 and 62.

Hereinafter, the operation of the bubble forming device 400 will be described.

The internal pressure of the gas-liquid mixing chamber 10 rises depending on the pressure at which the gas pump 30 discharges the gas and the pressure at which the liquid pump 40 discharges the liquid. As a result, the gas-liquid mixing fluid FL flows from the gas-liquid mixing chamber 10 into the bubble miniaturization tubular body 200. The bubble miniaturization tubular body 200 guides the gas-liquid mixing fluid FL introduced from one end 201 to the other end 202 via the coiled portion 203 and discharges it from the other end 202.

Inside the bubble miniaturization tubular body 200, a throttle portion for narrowing the flow of the gas-liquid mixed fluid FL is not provided. The cross-sectional area of the portion of the bubble miniaturization tubular body 200 through which the gas-liquid mixed fluid FL flows is constant from one end 201 to the other end 202.

However, the bubble miniaturization tubular body 200 has a sufficiently thin and long shape, and also has a coil-shaped portion 203. Therefore, a pressure loss occurs in the bubble miniaturization tubular body 200. As a result, the internal pressure of the bubble miniaturization tubular body 200 increases.

Specifically, the pressure at which the discharge unit 100 discharges the gas-liquid mixing fluid FL, that is, the internal pressure of the gas-liquid mixing chamber 10, increases the internal pressure of the bubble miniaturization tubular body 200 to the extent that the bubbles dissolve in the liquid. .. Therefore, the dissolution of the bubbles in the liquid due to the increased internal pressure proceeds over the period in which the gas-liquid mixed fluid FL flows through the bubble miniaturization tubular body 200. As a result, the bubbles contained in the gas-liquid mixed fluid FL are miniaturized in the bubble miniaturization tubular body 200.

As a means for increasing the internal pressure of the bubble micronization tubular body 200 to the extent that the bubbles dissolve in the liquid, the bubble micronization tubular body 200 is a gas-liquid mixture in the bubble miniaturization tubular body 200. When the cross-sectional area of the portion where the fluid FL flows is X and the path length of the bubble micronization tubular body 200 along the flow path of the gas-liquid mixed fluid FL is Y, the length scale defined by Y / X is 250 [1]. / Mm] or more.

Specifically, the inner diameter of the bubble miniaturization tubular body 200 is 5 [mm] or less, and the path length of the bubble miniaturization tubular body 200 is 5 [m] or more. In order to further ensure the pressure loss in the bubble miniaturization tubular body 200, the length scale Y / X is preferably 500 [1 / mm] or more, and 750 [1 / mm] or more. It is more preferable to have.

Further, as another means for increasing the internal pressure of the bubble miniaturization tubular body 200 to the extent that the bubbles dissolve in the liquid, in the present embodiment, the bubble miniaturization tubular body in the coil-shaped portion 203 is used. The number of turns of 200 is set to 5 or more. In order to further ensure the pressure loss in the bubble miniaturization tubular body 200, the number of turns of the coil-shaped portion 203 is preferably 10 or more, and more preferably 15 or more.

With the above-described configuration, the internal pressure of the bubble miniaturization tubular body 200 can be increased to, for example, a value higher than the atmospheric pressure and 0.3 MPa or less, and in the bubble miniaturization tubular body 200, the average diameter of the bubbles is set to 1. It can be miniaturized to 5/5 or less, more preferably 1/10 or less. For example, when the average diameter of bubbles in the gas-liquid mixing chamber 10 is 10 [μm] or less, the average diameter is 2 [μm] or less, more preferably 1 [μm] from the other end 202 of the bubble micronization tubular body 200. A gas-liquid mixed fluid FL containing the following bubbles can be obtained. When the average diameter of the bubbles in the gas-liquid mixing chamber 10 is 1 [μm] or less, the average diameter is 200 [nm] or less, more preferably 100 [nm] from the other end 202 of the bubble micronization tubular body 200. A gas-liquid mixed fluid FL containing the following bubbles can be obtained.

Further, when the gas-liquid mixed fluid FL is passed through the bubble miniaturization tubular body 200, a vortex is generated inside the bubble miniaturization tubular body 200. Hereinafter, this will be specifically described.

As shown in FIG. 2, a turbulent vortex TV is generated inside the bubble miniaturization tubular body 200 in a cross section parallel to the path length of the bubble miniaturization tubular body 200. In this turbulent vortex TV, the discharge unit 100 uses the gas-liquid mixed fluid FL under the condition that the Reynolds number of the flow of the gas-liquid mixed fluid FL inside the bubble miniaturization tubular body 200 is 3000 or more. It was realized by introducing it into the tubular body 200 for bubble miniaturization. The turbulent vortex TV promotes the miniaturization of bubbles in the bubble miniaturization tubular body 200.

As shown in FIG. 3, a Dean vortex DV is also formed in the cross section perpendicular to the path length of the bubble miniaturization tubular body 200. This Dean vortex DV is formed by the centrifugal force acting on the gas-liquid mixed fluid FL in the coil-shaped portion 203 described above. In FIG. 3, the direction in which the centrifugal force acts on the gas-liquid mixed fluid FL is indicated by an arrow. This Dean vortex DV also promotes the miniaturization of bubbles in the bubble miniaturization tubular body 200. As described above, the coiled portion 203 described above not only plays a role of causing a pressure loss in the bubble miniaturizing tubular body 200, but also plays a role of forming a Dean vortex DV.

According to the bubble forming apparatus 400 according to the present embodiment described above, the following effects can be obtained.

During the period from the introduction of the gas-liquid mixed fluid FL into the bubble miniaturization tubular body 200 until it is derived from the bubble miniaturization tubular body 200, the bubbles are dissolved in the liquid in the bubble miniaturization tubular body 200. Progresses. Therefore, by continuously introducing the gas-liquid mixed fluid FL into the bubble miniaturization tubular body 200, the gas-liquid mixed fluid FL containing the bubbles refined by dissolution can be continuously obtained.

In the prior art disclosed in Patent Document 1, the gas is once completely dissolved in the liquid by pressurization in the tank, and then the pressure in the tank is increased to atmospheric pressure so that bubbles of a desired size appear. Was there. On the other hand, according to the present embodiment, it is not necessary to go through the step of completely dissolving the gas in the liquid, and the bubbles can be directly refined to a desired size. Further, in order to miniaturize the bubbles to a desired size, it is sufficient to pass the gas-liquid mixed fluid FL through the bubble miniaturization tubular body 200 once. Therefore, a gas-liquid mixed fluid FL containing bubbles finely divided by dissolution can be efficiently obtained.

Further, since it is not necessary to go through the step of completely dissolving the gas in the liquid, the maximum pressure generated in the bubble forming apparatus 400 can be reduced as compared with the prior art. Specifically, it is sufficient to increase the internal pressure of the bubble miniaturization tubular body 200 to a value of 0.3 MPa or less, preferably 0.2 MPa or less. As described above, since the pressure generated in the bubble forming device 400 can be reduced as compared with the conventional case, the thickness of the bubble forming device 400 can be suppressed, and the bubble forming device 400 is less likely to fail.

Since the turbulent vortex TV and the Dean vortex DV are generated in the bubble miniaturization tubular body 200, the internal pressure of the bubble forming device 400 is higher than that in the case where the turbulent vortex TV and the Dean vortex DV are not generated. Even if it is low, the bubbles can be refined to a desired size. That is, the generation of the turbulent vortex TV and the Dean vortex DV contributes to reducing the internal pressure of the bubble miniaturization tubular body 200.

In the prior art disclosed in Patent Document 1, since the behavior of the liquid and the gas in the tank is random, the bubbles and the liquid of the gas-liquid mixed fluid obtained when the pressure in the tank is raised to the atmospheric pressure It was difficult to control the proportion of. On the other hand, in the present embodiment, since the shape of the bubble miniaturization tubular body 200 is fixed, the ratio of the bubble and the liquid in the gas-liquid mixed fluid FL before passing through the bubble miniaturization tubular body 200 is determined. The ratio of bubbles and liquid in the gas-liquid mixed fluid FL after passing through the bubble miniaturization tubular body 200 is unlikely to be uncorrelated.

Then, since the ratio of the bubble and the liquid in the gas-liquid mixed fluid FL before the passage of the bubble miniaturization tubular body 200 can be independently adjusted by using the valves 61 and 62, the ratio of the bubble and the liquid can be adjusted independently after the passage of the bubble miniaturization tubular body 200. The ratio of bubbles and liquid in the gas-liquid mixed fluid FL can also be adjusted independently.

[Embodiment 2]
In the first embodiment, the temperature of the gas-liquid mixed fluid FL was not positively adjusted, but the bubble forming device 400 adjusts the temperature of the gas-liquid mixed fluid FL via the bubble micronizing tubular body 200. Further means may be provided. Hereinafter, a specific example thereof will be described.

As shown in FIG. 4, the bubble forming device 500 according to the present embodiment includes a temperature adjusting device 300 as a temperature adjusting means for adjusting the temperature of the gas-liquid mixed fluid FL via the bubble miniaturizing tubular body 200. The temperature control device 300 includes a constant temperature liquid tank 310 in which the temperature control liquid is stored, and a temperature control device 320 that keeps the temperature control liquid in the constant temperature liquid tank 310 at a predetermined temperature. For example, water can be used as the temperature adjusting liquid.

In the present embodiment, the coiled portion 203 of the bubble miniaturization tubular body 200 is made of a metal having good heat conduction, specifically copper, and is immersed in the temperature adjusting liquid in the constant temperature liquid tank 310. Therefore, the temperature of the gas-liquid mixed fluid FL can be adjusted via the coiled portion 203. Since the coiled portion 203 has a large surface area, it is easy to adjust the temperature of the gas-liquid mixed fluid FL.

According to this embodiment, it is possible to obtain a gas-liquid mixed fluid FL adjusted to a desired temperature. Further, the solubility of bubbles in the liquid in the bubble miniaturization tubular body 200 can be adjusted by the temperature of the gas-liquid mixed fluid FL. The lower the temperature of the gas-liquid mixed fluid FL, the more easily the bubbles dissolve in the liquid, and the higher the temperature of the gas-liquid mixed fluid FL, the more difficult the bubbles dissolve in the liquid.

[Embodiment 3]
In the first embodiment, the bubbles are miniaturized using one bubble miniaturization tubular body 200, but the bubble forming device 400 may include a plurality of bubble miniaturization tubular bodies 200. Hereinafter, a specific example thereof will be described.

As shown in FIG. 5, the bubble forming apparatus 600 according to the present embodiment includes two bubble miniaturizing tubular bodies 210 and 220. Two bubble miniaturization in the gas-liquid mixing chamber 10 of the discharge unit 100 so that the gas-liquid mixing fluid FL discharged from the discharge unit 100 flows in parallel with the two bubble miniaturization tubular bodies 210 and 220. Tubular bodies 210 and 220 are connected.

According to the present embodiment, in the bubble miniaturization tubular bodies 210 and 220, the bubble miniaturization can be performed in parallel, so that the bubble miniaturization can be efficiently performed.

[Example 1]
Using the bubble forming apparatus 400 shown in FIG. 1, a gas-liquid mixed fluid FL containing bubbles refined by the bubble miniaturization tubular body 200 was obtained. Air was used as the gas constituting the gas-liquid mixed fluid FL, and distilled water was used as the liquid.

Further, for the bubble miniaturization tubular body 200, a metal tube having an inner diameter of 4 [mm] and a path length of 10 [m] was used. The length scale Y / X of this metal tube is 796 [1 / mm]. The diameter of the coiled portion 203 was about 20 [cm], and the number of turns of the coiled portion 203 was 15.

First, in the gas-liquid mixing chamber 10, bubbles made of air were dispersed in distilled water to form a gas-liquid mixing fluid FL. The average diameter of the bubbles contained in the gas-liquid mixing fluid FL in the gas-liquid mixing chamber 10 was 1 [μm].

Next, the gas-liquid mixed fluid FL is provided under the condition that the internal pressure of the bubble miniaturization tubular body 200 is increased to 0.2 [MPa] and the Reynolds number of the flow of the gas-liquid mixed fluid FL is 3000 or more. It was introduced into the bubble miniaturization tubular body 200. Then, the gas-liquid mixed fluid FL containing the bubbles refined by dissolution was continuously discharged from the other end 202 of the bubble miniaturization tubular body 200.

FIG. 6 shows the frequency distribution of bubbles in the gas-liquid mixed fluid FL discharged from the bubble miniaturization tubular body 200 by diameter. Graph A shows a frequency distribution, and Graph B shows a cumulative frequency distribution. The average diameter of the bubbles contained in the gas-liquid mixed fluid FL was 100 nm or less. That is, it was confirmed that the average diameter of the bubbles was reduced to 1/10 or less in the bubble miniaturization tubular body 200.

[Example 2]
A gas-liquid mixed fluid FL containing bubbles refined by dissolution was obtained under the same conditions as in Example 1 except that oxygen was used as the gas constituting the gas-liquid mixed fluid FL.

FIG. 7 shows the frequency distribution of bubbles in the obtained gas-liquid mixed fluid FL by diameter. Graph C shows a frequency distribution, and graph D shows a cumulative frequency distribution. The average diameter of the bubbles contained in the gas-liquid mixed fluid FL was 100 nm or less. That is, it was confirmed that the average diameter of the bubbles was reduced to 1/10 or less in the bubble miniaturization tubular body 200.

[Example 3]
A gas-liquid mixed fluid FL containing bubbles refined by dissolution was obtained under the same conditions as in Example 1 except that tap water was used as the liquid constituting the gas-liquid mixed fluid FL.

FIG. 8 shows the frequency distribution of bubbles in the obtained gas-liquid mixed fluid FL by diameter. Graph E shows a frequency distribution, and graph F shows a cumulative frequency distribution. The average diameter of the bubbles contained in the gas-liquid mixed fluid FL was 100 nm or less. That is, it was confirmed that the average diameter of the bubbles was reduced to 1/10 or less in the bubble miniaturization tubular body 200.

[Example 4]
A gas-liquid mixed fluid FL containing bubbles refined by dissolution was obtained under the same conditions as in Example 1 except that tap water was used as the liquid constituting the gas-liquid mixed fluid FL and oxygen was used as the gas. ..

FIG. 9 shows the frequency distribution of bubbles in the obtained gas-liquid mixed fluid FL by diameter. Graph G shows a frequency distribution, and graph H shows a cumulative frequency distribution. The average diameter of the bubbles contained in the gas-liquid mixed fluid FL was 100 nm or less. That is, it was confirmed that the average diameter of the bubbles was reduced to 1/10 or less in the bubble miniaturization tubular body 200.

Although the embodiments and examples of the present invention have been described above, the present invention is not limited to this. For example, the modifications described below are also possible.

In the first embodiment, the coil-shaped portion 203 is provided on the bubble miniaturization tubular body 200, but the coil-shaped portion 203 is not essential. If a part of the bubble miniaturization tubular body 200 is curved, a Dean vortex DV can be formed. Further, in order to make the bubbles finer, the formation of the Dean vortex DV is not indispensable. Even in a tubular body for bubble miniaturization made of a straight pipe extending linearly, an increase in internal pressure due to pressure loss can occur, and bubbles can be miniaturized by the increased internal pressure.

Although the gas source GS is shown in FIG. 1 for ease of understanding, for example, when the gas is air, the gas source GS can be omitted. Further, when a cylinder into which a gas is injected is used as the gas source GS, the gas discharge pressure from the cylinder can be used, so that the gas pump 30 can be omitted. Further, when a pressurized liquid is obtained as in the case of using tap water as the liquid, the liquid source LS and the liquid pump 40 may be omitted.

In the first embodiment, the cross-sectional area of the portion of the bubble miniaturization tubular body 200 through which the gas-liquid mixed fluid FL flows is constant from one end 201 to the other end 202, but this is not essential. The cross-sectional area of the bubble miniaturization tubular body 200 may differ depending on the position of the bubble miniaturization tubular body 200 in the path length direction. For example, a throttle portion for narrowing the flow of the gas-liquid mixed fluid FL may be provided in the bubble miniaturization tubular body 200. When the cross-sectional area of the bubble miniaturization tubular body 200 differs depending on the position in the path length direction, the cross-sectional area defining the length scale Y / X is defined as X refers to the maximum cross-sectional area of the bubble miniaturization tubular body 200. It shall be.

In the third embodiment, the bubble forming device 600 includes two bubble miniaturizing tubular bodies 210 and 220, but the bubble forming device 600 may include three or more bubble miniaturizing tubular bodies. Further, the dimensions and shapes of the plurality of bubble miniaturization tubular bodies may be different from each other.

The present invention allows various modifications without departing from its broad spirit and scope. The above embodiments and examples are for explaining the present invention, and do not limit the scope of the present invention. The scope of the invention is indicated by the claims. Various modifications made within the claims and equivalents are considered to be within the scope of the invention.

This application is based on Japanese Patent Application No. 2017-11245 filed in Japan on June 7, 2017. The specification of Japanese Patent Application No. 2017-112245, the scope of claims, and the entire drawing shall be incorporated into this specification as a reference.

The bubble forming apparatus and the bubble forming method according to the present invention can be used for forming a gas-liquid mixed fluid containing finely divided bubbles.

10 ... Gas-liquid mixing chamber,
20 ... Porous member,
30 ... Gas pump,
40 ... Liquid pump,
51, 52 ... Piping,
61, 62 ... valve,
71,72,73 ... Pressure gauge,
100 ... Discharge part,
200, 210, 220 ... Tubular body for bubble miniaturization,
201 ... One end of a tubular body for bubble miniaturization,
202 ... The other end of the tubular body for bubble miniaturization,
203 ... Coiled part,
300 ... Temperature control device (temperature control means),
310 ... Constant temperature liquid tank,
320 ... Temperature regulator,
400,500,600 ... Bubble forming device,
LS ... liquid source,
GS ... gas source,
FL ... Gas-liquid mixed fluid,
TV ... Turbulent vortex,
DV ... Dean Vortex.

Claims (3)

A discharge unit that forms a gas-liquid mixed fluid containing a liquid and bubbles dispersed in the liquid and discharges the formed gas-liquid mixed fluid.
A tubular body having both ends open, and the gas-liquid mixed fluid discharged by the discharging portion is introduced from one end and the introduced gas-liquid mixed fluid is guided to the other end. When,
A temperature adjusting means for adjusting the temperature of the gas-liquid mixed fluid via the bubble miniaturization tubular body, and
Equipped with
The temperature adjusting means
A constant temperature liquid tank that stores the temperature control liquid,
A temperature regulator that keeps the temperature adjusting liquid in the constant temperature liquid tank at a predetermined temperature, and
Have,
The tubular body for bubble miniaturization
The centrifugal force that forms a Dean vortex in the gas-liquid mixed fluid is wound a plurality of times in a coil shape so as to act on the gas-liquid mixed fluid, and is immersed in the temperature adjusting liquid in the constant temperature liquid tank. Coiled part,
Have,
The cross-sectional area of the portion of the bubble miniaturization tubular body having an inner diameter of 5 [mm] or less and through which the gas-liquid mixed fluid flows is set to X in the flow path of the gas-liquid mixed fluid. When the path length of the bubble micronization tubular body along the line is Y, the length scale defined by Y / X is 500 [1 / mm] or more.
The discharge portion forms a flow of the gas-liquid mixed fluid having a Reynolds number of 3000 or more inside the bubble miniaturization tubular body, and the internal pressure of the bubble miniaturization tubular body is higher than the atmospheric pressure. The gas-liquid mixed fluid was introduced into the one end of the bubble micronization tubular body under the condition of being increased to a value of 0.3 [MPa] or less.
During the period in which the gas-liquid mixed fluid flows through the bubble miniaturization tubular body, the dissolution of the bubbles into the liquid by the internal pressure proceeds, so that the average diameter of the bubbles in the bubble miniaturization tubular body is increased. Miniaturized to 1/10 or less,
From the other end of the bubble miniaturization tubular body, the gas-liquid mixed fluid having the average diameter of the bubbles of 100 [nm] or less and the density of the bubbles of 3.7 [100 million cells / mL] or more. Is obtained,
Bubble forming device. A plurality of the above-mentioned tubular bodies for bubble miniaturization are provided.
A plurality of the bubble miniaturization tubular bodies are connected to the discharge portion so that the gas-liquid mixed fluid discharged from the discharge portion flows in parallel with the plurality of the bubble miniaturization tubular bodies. ,
The bubble forming apparatus according to claim 1. The discharge part
It has a configuration in which the flow rates of the liquid constituting the gas-liquid mixture fluid and the gas constituting the bubbles of the gas-liquid mixture fluid can be adjusted independently.
The bubble forming apparatus according to claim 1 or 2 .

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