WO2025069563A1 - 気泡形成装置及び気泡形成方法 - Google Patents

気泡形成装置及び気泡形成方法 Download PDF

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Publication number
WO2025069563A1
WO2025069563A1 PCT/JP2024/019529 JP2024019529W WO2025069563A1 WO 2025069563 A1 WO2025069563 A1 WO 2025069563A1 JP 2024019529 W JP2024019529 W JP 2024019529W WO 2025069563 A1 WO2025069563 A1 WO 2025069563A1
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Prior art keywords
holes
porous body
hole
liquid
bubbles
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PCT/JP2024/019529
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English (en)
French (fr)
Japanese (ja)
Inventor
崇 五島
重幸 三上
Original Assignee
株式会社村田製作所
国立大学法人 鹿児島大学
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Priority to JP2025507026A priority Critical patent/JPWO2025069563A1/ja
Publication of WO2025069563A1 publication Critical patent/WO2025069563A1/ja

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/20—Mixing gases with liquids
    • B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
    • B01F23/237—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids characterised by the physical or chemical properties of gases or vapours introduced in the liquid media
    • B01F23/2373—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids characterised by the physical or chemical properties of gases or vapours introduced in the liquid media for obtaining fine bubbles, i.e. bubbles with a size below 100 µm
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/30—Injector mixers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/40—Static mixers
    • B01F25/45—Mixers in which the materials to be mixed are pressed together through orifices or interstitial spaces, e.g. between beads
    • B01F25/452—Mixers in which the materials to be mixed are pressed together through orifices or interstitial spaces, e.g. between beads characterised by elements provided with orifices or interstitial spaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/71—Feed mechanisms

Definitions

  • the present invention relates to a bubble forming device and a bubble forming method.
  • a static bubble-forming device that generates microscopic bubbles without using a power source to create a liquid flow.
  • microscopic bubbles are generated from a nozzle or porous body with a constriction.
  • measures such as adding a surfactant to the surface of the nozzle or porous body to make it hydrophilic must be taken, and there is a limit to how much the size of the microscopic bubbles that are formed can be reduced, resulting in variation in the size of the microscopic bubbles.
  • the present invention was made in light of the above situation, and aims to provide an air bubble forming device and air bubble forming method that can generate a large amount of uniformly sized fine air bubbles without using power to create a liquid flow.
  • a bubble forming device comprises: a first porous body having an array of first through holes formed therein, and having a gas injected from one end of the first through holes to generate microbubbles at the other end in contact with a liquid; a second porous body having an array of second through holes through which microbubbles and liquid can pass, the second porous body being disposed in the liquid so as to deform the microbubbles growing from the other ends of the first through holes;
  • the second porous body is The second through-hole is disposed so that the direction of the second through-hole is the same as that of the first through-hole, with a gap provided between the first porous body and the second through-hole that allows the passage of microbubbles and liquid.
  • each of the first through holes has a uniform shape and size in a cross section perpendicular to the penetration direction thereof, and is arranged at a constant pitch. This may also be the case.
  • the first through holes and the second through holes are arranged at a constant pitch,
  • the arrangement pitch of the first through holes is at least twice the arrangement pitch of the second through holes. This may also be the case.
  • the second porous body is a mesh structure in which the second through holes are formed by a mesh of mesh fibers. This may also be the case.
  • the shape of the inner wall is bent or curved. This may also be the case.
  • the cross-sectional shape of the second through hole as viewed in the through direction is polygonal. This may also be the case.
  • An adjustment unit capable of adjusting the size of the gap is provided. This may also be the case.
  • a bubble forming method comprises: passing a gas through one end of a first through hole arranged in a first porous body into the first through hole to generate microbubbles at the other end of the first through hole that is in contact with a liquid;
  • the present invention makes it possible to generate large amounts of uniformly sized microscopic bubbles without using power to create a liquid flow.
  • FIG. 1 is a perspective view showing an overall configuration of an air bubble forming device according to an embodiment of the present invention
  • 1B is a cross-sectional view showing the configuration of the bubble generating unit of FIG. 1A.
  • 4 is an enlarged schematic diagram showing the configuration of a bubble generating section.
  • FIG. 11 is a schematic diagram of the mesh structure as viewed in the penetrating direction of second through holes.
  • FIG. 1 is a first schematic diagram showing a process from the generation of fine bubbles to their departure.
  • FIG. 2 is a second schematic diagram showing the process from when fine bubbles are generated to when they leave.
  • FIG. 11 is a third schematic diagram showing the process from the generation of fine bubbles to their departure.
  • FIG. 2 is a schematic diagram showing how a plurality of fine bubbles are formed simultaneously.
  • FIG. 11 is a schematic diagram of a second through hole as viewed from the through-hole direction.
  • FIG. FIG. 2 is a schematic diagram showing the joining of fine bubbles.
  • FIG. 13 is a schematic diagram showing a modified example of the second porous body.
  • 4 is a flowchart showing a bubble forming method according to an embodiment of the present invention.
  • 2 is a graph showing a comparison between the size and variation of the Sauter diameter of fine bubbles formed by the air bubble forming device of FIG. 1 and the size and variation of the Sauter diameter of fine bubbles formed by air bubble forming devices of other types.
  • 2 is a graph showing a comparison of the characteristics of the mass transfer coefficient with respect to the gas superficial velocity in the bubble-forming device of FIG. 1 and in another type of bubble-forming device.
  • 2 is a graph showing a comparison of the characteristics of the mass transfer volumetric coefficient versus the required power in the bubble-forming device of FIG. 1 and in another type of bubble-forming device.
  • Air bubble forming device The overall configuration of an air bubble formation device 100 according to the present embodiment will be described with reference to Figures 1A and 1B. As shown in Figure 1A, the air bubble formation device 100 according to the present embodiment forms fine air bubbles B.
  • the air bubble formation device 100 includes an air bubble generation unit 1, a first container 2, and a second container 3.
  • the first container 2 is an air storage chamber that temporarily stores the gas G.
  • the bubble generating section 1 forms the top surface of the first container 2 and also forms part of the bottom surface of the second container 3.
  • the bubble generating unit 1 is disposed at the boundary between the first area Ar1 and the second area Ar2, and defines the boundary.
  • the bubble generating unit 1 takes in gas G from the bottom of the first container 2 and ejects fine bubbles B into the liquid L of the second container 3.
  • the bubble forming device 100 includes a gas supply source 4, a gas supply pipe 5, a regulator 6, a flowmeter 7, a pressure gauge 8, and a control unit 10.
  • the gas supply source 4 is a supply source of gas G that is the source of fine bubbles B.
  • the gas supply pipe 5 supplies the gas G supplied from the gas supply source 4 to the first region Ar1 in the first container 2.
  • the regulator 6 adjusts the amount of gas G supplied from the gas supply source 4 through the gas supply pipe 5.
  • the flow meter 7 measures the flow rate of the gas G supplied from the gas supply source 4 through the gas supply pipe 5.
  • the pressure meter 8 measures the air pressure of the gas G supplied from the gas supply source 4 through the gas supply pipe 5.
  • the control unit 10 adjusts the regulator 6 based on the flow rate of the gas G measured by the flow meter 7 and the air pressure of the gas G measured by the pressure meter 8 to control the flow rate and pressure of the gas G.
  • the bubble generation section 1 includes a first porous body 11 and a second porous body 12.
  • the first porous body 11 and the second porous body 12 are both plate-shaped members.
  • the first porous body 11 has a first surface S1 and a second surface S2 facing in the opposite direction to the first surface S1.
  • the first surface S1 is disposed so as to contact the first region Ar1 filled with gas in the first container 2.
  • the second surface S2 is disposed so as to contact the second region Ar2 filled with liquid L.
  • the areas of the first surface S1 and the second surface S2 of the first porous body 11 may be any size.
  • the area may be 1.0 cm x 1.0 cm, but is not limited thereto.
  • the first porous body 11 has an array of first through holes 11a that penetrate between the first surface S1 and the second surface S2.
  • each of the first through holes 11a functions as a bubble generating nozzle that ejects fine bubbles B.
  • the end of the first surface S1 is a gas introduction end where gas G is introduced
  • the end of the second surface S2 is a bubble ejection end where fine bubbles B are ejected.
  • the first porous body 11 generates fine bubbles B at the end of the second surface S2 that comes into contact with the liquid L into which gas has been injected from the gas introduction end of the first through holes 11a.
  • the first through hole 11a connects the gas introduction end and the bubble discharge end in a straight line.
  • the shape of the first through hole 11a is a straight column, for example, a right circular cylinder or a right-angled prism.
  • the shape of the first through hole 11a may be an oblique cylinder, a curved shape, or a shape in which the size of the cross section perpendicular to the penetration direction changes along the penetration direction.
  • each of the first through holes 11a through which gas G is introduced from the same first container 2 has a uniform cross-sectional shape and size (diameter D) perpendicular to the penetration direction, and is arranged at a constant arrangement pitch P1. Therefore, the size of the fine bubbles B generated in each of the multiple first through holes 11a is uniform (see FIG. 5).
  • the hole diameter D of the first through holes 11a can be, for example, 2 ⁇ m, but can be changed depending on the size of the micro-bubbles B to be formed, and can be, for example, 10 ⁇ m or less.
  • the arrangement pitch P1 of the first through holes 11a can be 1250 ⁇ m.
  • the number of the first through holes 11a can be about 36.
  • the hole diameter, hole pitch, and number of the first through holes 11a are not limited to this.
  • the first porous body 11 can be, for example, a silicon substrate that has been subjected to a hydrophilic treatment in which the surface is treated without applying a surfactant. In this hydrophilic treatment, for example, the water repellency of the surface is reduced by surface processing.
  • the material of the first porous body 11 is not limited to silicon, and a material that is highly rigid and does not easily deform, such as metal or ceramics, can be selected. However, if the first porous body 11 is a silicon substrate, minute first through holes 11a of the desired size can be formed with high precision in the desired location using semiconductor manufacturing technology.
  • the second porous body 12 is disposed in the liquid L in the second region Ar2.
  • the second porous body 12 has a third surface S3 and a fourth surface S4 facing in the opposite direction to the third surface S3, and is disposed so that the third surface S3 faces the second surface S2 of the first porous body 11.
  • the second porous body 12 is disposed in a direction in which the fine bubbles B generated at the end of the second surface S2 of the first through-hole 11a grow.
  • the second porous body 12 has second through-holes 12a arranged therein, which penetrate between the third surface S3 and the fourth surface S4.
  • the second through holes 12a are large enough to allow the passage of microscopic bubbles B and liquid L.
  • the shortest distance between the opposing inner walls of the second through holes 12a is shown as L2.
  • the second through holes 12a are arranged at a constant arrangement pitch P2. In the horizontal direction, the position of the second through holes 12a may coincide with the position of the first through holes 11a, but considering the escape of the microscopic bubbles B, it is desirable that the first through holes 11a and the second through holes 12a are basically arranged apart.
  • the circle-equivalent diameter L2 of the second through holes 12a can be, for example, 0.18 mm, but can be adjusted as appropriate.
  • the circle-equivalent diameter L2 of the second through holes 12a need only be greater than 0.1 mm.
  • the arrangement pitch P2 of the second through holes 12a can be, for example, 254 ⁇ m. However, the circle-equivalent diameter L2 and arrangement pitch P2 of the second through holes 12a can be changed as appropriate.
  • the second porous body 12 can be a mesh structure 21 in which the second through holes 12a are formed by a mesh of mesh fibers 20.
  • the mesh fibers 20 can be, for example, stainless steel fibers that have been subjected to a hydrophilic treatment to increase the wettability of the surface without using a surfactant.
  • the material of the mesh fibers 20 is not limited to this.
  • the mesh fibers 20 can have only one layer. This is because multiple layers increase the flow resistance when the liquid L tries to flow through the second through holes 12a in the plate thickness direction.
  • the second porous body 12 is arranged with respect to the first porous body 11 with a gap E (distance L1) that allows the passage of microscopic bubbles B and liquid L, so that the second through-holes 12a are oriented in the same direction as the first through-holes 11a.
  • Gap E can be, for example, 100 ⁇ m, but it is generally desirable to set it to 0.1 mm or more and 0.4 mm or less.
  • a spacer 13 is provided between the first porous body 11 and the second porous body 12.
  • the spacer 13 may be designed so that its vertical length can be adjusted.
  • the spacer 13 functions as an adjustment unit that can adjust the size of the gap E.
  • the adjustment unit adjusts the gap E to a size that will result in microbubbles B of the desired size.
  • the mesh structure 21 may be floated by the buoyancy of the generated microscopic bubbles B, creating a gap E between the first porous body 11 and the mesh structure 21.
  • the outer edges of the first porous body 11 and the second porous body 12 may be connected to each other without the spacer 13.
  • the first porous body 11 generates microbubbles B at the ends of the first through-holes 11a on the second surface S2.
  • the microbubbles B gradually grow and become larger.
  • the liquid L present in the gap E can move horizontally as the microbubbles B grow. This promotes the growth of the microbubbles B.
  • the liquid L can move freely horizontally through the gap E and pass between them. This makes it easier for the microscopic bubbles B to grow horizontally as well.
  • microbubbles B continue to grow, as shown in FIG. 4B, their growth is hindered by the second porous body 12, and the microbubbles B deform in the direction of entering the second through-hole 12a. In response to this deformation, some of the liquid L in the second through-hole 12a escapes toward the gap E. This further promotes the growth of the microbubbles B from the end of the first through-hole 11a.
  • a gap E is provided between the first porous body 11 and the second porous body 12, and the second through hole 12a is provided in the second porous body 12, so that as the micro-bubbles B grow, the liquid L can easily pass through the gap E and the second through hole 12a.
  • This not only makes it easier for the micro-bubbles B to grow, but also makes it easier for the micro-bubbles B to leave the end of the first through hole 11a.
  • new micro-bubbles B are generated at that end. In this way, in the bubble generating section 1, micro-bubbles B are continuously generated.
  • the second porous body 12 is positioned to prevent the growth of the microbubbles B generated at the end of the first through hole 11a, deforming them and promoting the escape of the microbubbles from the other end of the first through hole.
  • the generation, growth, and release of microscopic bubbles B are repeated intermittently from the multiple first through-holes 11a of the first porous body 11, resulting in the generation of a large number of microscopic bubbles B of uniform size in the liquid L. This makes it possible to achieve monodispersion of the microscopic bubbles B.
  • the mesh fiber 20 has a circular cross section perpendicular to its longitudinal direction.
  • the shape of the inner wall when the second through hole 12a is cut along a cutting plane including the center line CL of the second through hole 12a extending in the penetration direction is curved. This reduces the flow resistance of the inner wall of the second through hole 12a to the liquid L, making it easier for the liquid L to move and promoting the growth and release of the microbubbles B.
  • the cross-sectional shape of the second through-hole 12a when viewed in the penetration direction is rectangular.
  • micro-bubbles B tend to become round due to their surface tension. Therefore, when the cross-sectional shape of the second through-hole 12a is rectangular, a passage for the liquid L is created at the four corners of the second through-hole 12a. In this way, the liquid L can easily move through this passage in the opposite direction to the micro-bubbles B, which can promote the growth and detachment of the micro-bubbles B.
  • the cross-sectional shape of the second through hole 12a when viewed in the penetration direction is not limited to a square shape, but may be a triangle or a pentagon or more. In other words, the cross-sectional shape of the second through hole 12a when viewed in the penetration direction may be any polygonal shape.
  • the arrangement pitch P1 of the first through holes 11a and the arrangement pitch P2 of the second through holes 12a were the same as shown in FIG. 7, the micro-bubbles B generated in two adjacent first through holes 11a would gather in one second through hole 12a and become one, generating a large micro-bubble B.
  • the arrangement pitch P1 of the first through holes 11a is twice the arrangement pitch P2 of the second through holes 12a. In this way, the micro-bubbles B that escape through the second through holes 12a can be guaranteed to have been generated in one of the first through holes 11a, thereby improving the uniformity of the micro-bubbles B.
  • the arrangement pitch of the first through holes 11a should be at least twice the arrangement pitch of the second through holes 12a.
  • the cross section perpendicular to the longitudinal direction of the mesh fiber 20 may be rectangular.
  • the penetration direction of the second through hole 12a is along one diagonal of the rectangular cross section.
  • the shape of the inner wall of the second through hole 12a when the second through hole 12a is cut at a cutting surface including the center line CL extending in the penetration direction will be a bent shape. This reduces the flow resistance of the inner wall of the second through hole 12a to the liquid L, making it easier for the liquid L to move and promoting the escape of the fine bubbles B.
  • a bubble forming method using the bubble forming device 100 according to this embodiment will be described.
  • a first porous body 11 and a second porous body are manufactured (step S1). Specifically, a silicon substrate is subjected to etching or the like to form a plurality of first through holes 11a, thereby manufacturing the first porous body 11.
  • step S2 the bubble generating unit 1 is assembled (step S2). Specifically, the mesh structure 21, i.e., the second porous body 12, is attached to the first porous body 11 via the spacer 13, thereby assembling the bubble generating unit 1.
  • step S3 the bubble forming device 100 is set up (step S3).
  • the first container 2, the second container 3, and the bubble generating unit 1 are assembled as shown in FIG. 1, and the gas supply source 4, the gas supply pipe 5, the regulator 6, the pressure gauge 8, the flow meter 7, and the control unit 10 are attached to this assembly to assemble the entire bubble forming device 100.
  • bubbles are formed in the bubble forming device 100 (step S4). Specifically, gas is supplied to the first area Ar1 of the first container 2, and liquid L is supplied to the second area Ar2 of the second container 3.
  • the control unit 10 adjusts the air pressure of the gas in the first area Ar1 to be higher than the water pressure of the liquid L in the second area Ar2, and passes the gas through the first through hole 11a.
  • step S4 the following operations (A) and (B) are carried out in the air bubble generating unit 1.
  • (A) Gas is passed through the first through hole 11a from the end of the first surface S1 of the first through hole 11a arranged in the first porous body 11, generating fine bubbles B at the end of the second surface S2 of the first through hole 11a that comes into contact with the liquid L.
  • a second porous body 12 having an array of second through holes 12a through which micro-bubbles B and liquid L can pass is placed in liquid L so that the orientation of the second through holes 12a is the same as that of the first through holes 11a and a gap E through which the micro-bubbles B and liquid L can pass is created between the second porous body 12 and the first porous body 11, and the micro-bubbles B growing from the ends of the second surface S2 of the first through holes 11a are deformed.
  • the air bubble forming device 100 can generate a large amount of fine bubbles B having a uniform desired size without using mechanical power. Smaller fine bubbles B rise slower and have a smaller inertial force. Furthermore, when the sizes of the fine bubbles B differ, the smaller ones tend to be absorbed by the larger ones, but the fine bubbles B formed by the air bubble forming device 100 are uniform in size and can exist in balance without being absorbed by each other. When a bubble group of monodispersed fine bubbles B with an average bubble diameter of 200 ⁇ m or less is formed, even if the fine bubbles B are generated at a high density, they can float without coalescing and dissolve and shrink in the liquid L.
  • the Sauter diameter (surface area to volume ratio) of the micro-bubbles B generated when the mesh diameter of the second through-hole 12a, i.e., the mesh structure 21, was set to 2.4 mm, 0.74 mm, 0.36 mm, and 0.18 mm was measured.
  • Figure 10 shows the measurement results. As shown in Figure 10, the smaller the mesh diameter, the smaller the Sauter diameter of the micro-bubbles B, and the smaller the variation in the Sauter diameter. In particular, it was found that the size of the micro-bubbles B was uniform when the mesh diameter (circle equivalent diameter) was set to 0.36 mm and 0.18 mm. When the mesh diameter was set to 0.18 mm, the average Sauter diameter of the micro-bubbles B was approximately 198 ⁇ m, and the coefficient of variation (CV value) was 18.4%.
  • FIG. 10 shows, for comparison, the Sauter diameter of microbubbles B in another bubble generating device that uses the first porous body 11 to create a steady flow field in the liquid L and generates microbubbles B by the flow field, and the Sauter diameter of microbubbles B in another bubble generating device that generates microbubbles B by vibrating the first porous body 11.
  • the variation in the Sauter diameter of the microbubbles B is reduced compared to when microbubbles B of the same diameter are generated by a steady flow field and a vibrating flow field.
  • the mass transfer capacity coefficient K L a of the fine bubbles B in the liquid L when the fine bubbles B are formed using the bubble-forming device 100 according to the present embodiment is evaluated.
  • the mass transfer capacity coefficient K L a is an index showing how many fine bubbles B can be dissolved in the same volume.
  • FIG. 11 shows the characteristics of the mass transfer coefficient K L a with respect to the gas superficial velocity.
  • the changes in the mass transfer coefficient K L a with respect to the gas superficial velocity [cm/s] are plotted in the bubble generating device 100 according to the present embodiment, a stacked slit type bubble generating device that generates bubbles with stacked slits, a sintered ball type bubble generating device that generates bubbles with sintered balls, and a single-hole nozzle type bubble generating device that generates bubbles with a single - hole nozzle.
  • the mass transfer capacity coefficient K L a is dramatically improved to 85 times that in the absence of the second porous body 12. This shows that the air bubble formation device 100 has high gas dissolving ability at a low gas flow rate. In other words, this shows that the air bubble formation device 100 according to this embodiment can be made compact and portable.
  • FIG. 12 shows the characteristics of the mass transfer capacity coefficient K L a with respect to the required power.
  • FIG. 12 shows the mass transfer capacity coefficient K L a in the case where the second porous body 12 without a mesh (second through hole) is used in the air bubble formation device 100 according to this embodiment, and in the case where the mesh hole diameter is 0.74 mm, 0.36 mm, and 0.18 mm. As shown in FIG.
  • the air bubble formation device of the Venturi type, the pressurized dissolution type, the swirling liquid flow type, and the ejector type requires a large required power because it is necessary to create a liquid flow by power, while the required power needs to be increased if the mass transfer capacity coefficient K L a is to be increased even in the case where a porous plate is used or a constant flow nozzle is used.
  • the air bubble formation device 100 according to this embodiment can obtain a high gas dissolving ability under an extremely small power for supplying gas at a predetermined atmospheric pressure. It has also been revealed that the air bubble formation device 100 according to this embodiment can increase the mass transfer capacity coefficient K L a as the mesh diameter is made smaller.
  • a gap E is formed between the first porous body 11 and the second porous body 12 so that the liquid L in the area surrounding the micro-bubbles B can pass freely, so that a large amount of micro-bubbles of uniform size can be generated without creating a liquid flow using power.
  • the first through holes 11a have a uniform shape and size (diameter D) in a cross section perpendicular to the penetration direction, and are arranged at the same arrangement pitch P1. In this way, a large amount of fine air bubbles B of uniform size can be formed at once.
  • the arrangement pitch P1 of the first through holes 11a is at least twice the arrangement pitch P2 of the second through holes 12a.
  • the first through holes 11a and the second through holes 12a should be arranged so that the fine air bubbles B generated in each of the multiple first through holes 11a do not gather in one second through hole 12a.
  • the second porous body is a mesh structure 21 in which a mesh that constitutes the second through-holes 12a is formed by the mesh fibers 20.
  • the mesh structure 21 is suitable for preventing the growth of the fine air bubbles B generated in the first through-holes 11a and obtaining fine air bubbles B of a desired size.
  • the second porous body 12 is the mesh structure 21, as described above, it is possible to float the mesh structure 21 by the buoyancy of the fine air bubbles B generated in the first through-holes 11a and form a gap E between the mesh structure 21 and the first porous body 11.
  • the bubble forming device 100 of this embodiment when the second through hole 12a is cut at a cutting surface including a center line CL extending in the through hole direction, the shape of the inner wall of the second through hole 12a is bent or curved. This reduces the flow resistance of the liquid L passing through the second through hole 12a, making it easier for the micro-bubbles B and the liquid L to pass through the second through hole 12a. This makes it easier for the micro-bubbles B to escape.
  • the cross-sectional shape of the second through-hole 12a when viewed in the penetration direction is polygonal. This makes it possible to secure a flow path through which the liquid L passes within the second through-hole 12a. This makes it easier to release the fine bubbles B.
  • the spacer 13 functions as an adjustment unit that can adjust the size of the gap E. By changing the size of the gap E, it is possible to change the size of the fine air bubbles B that are formed.
  • the size of the escaping microbubbles B can be adjusted by adjusting the cross-sectional shape, size and number of holes of the first through hole 11a and the second through hole 12a, the cross-sectional shape of the mesh fiber, the ratio of the arrangement pitch of the first through hole 11a and the second through hole 12a, and the affinity of the first porous body 11 and the second porous body 12 with the liquid L (e.g. water).
  • the liquid L e.g. water
  • the second porous body 12 is a mesh structure 21.
  • the second porous body 12 may be formed from a substrate similar to that of the first porous body 11.
  • the bubble generating unit 1 is installed so that the second surface S2 and the fourth surface S4 face upward.
  • this is not limited to this.
  • the bubble generating unit 1 may be installed so that the second surface S2 and the fourth surface S4 face horizontally.
  • the bubble formation device 100 according to this embodiment can be a completely sealed batch device. Therefore, a material with excellent pressure resistance and chemical resistance can be selected as the material for the bubble formation device 100 according to the experimental environment. Furthermore, the type of gas G to be supplied can be freely set.
  • the air bubble forming device 100 not only has the ability to produce fine air bubbles and has high size controllability for the fine air bubbles B, but also realizes compactness and portability of the device, allowing it to be attached to bottles, small aquariums, etc. Therefore, in addition to use in primary industries such as aquariums and bioactivities, it can be widely applied in fields such as beauty and skin care, life sciences and pharmaceuticals that require the production of a wide variety of products in small quantities, such as beverages and adding texture and taste, and in household toilet cleaning.
  • the bubble forming device 100 has a device structure that generates fine bubbles in the bulk liquid simply by placing the second porous body (baffle plate) 12 having a mesh structure on the first porous body (perforated plate) 11 without applying an external force. Therefore, the bubble generating ability can be dramatically improved by replacing the perforated plate that has been used as the most common bubble generating device in the conventional chemical industry with the bubble generating unit 1 according to this embodiment, and the significance and value of the bubble generating unit 1 is very great.
  • the present invention can be applied to form fine bubbles.
  • Bubble generating section 2 First container, 3 Second container, 4 Gas supply source, 5 Gas supply pipe, 6 Regulator, 7 Flow meter, 8 Pressure gauge, 10 Control section, 11 First porous body, 11a First through hole, 12 Second porous body, 12a Second through hole, 13 Spacer, 20 Mesh fiber, 21 Mesh structure, 100 Bubble forming device, Ar1 First region, Ar2 Second region, B Fine bubbles, CL Center line, E Gap, G Gas, L Liquid, S1 First surface, S2 Second surface, S3 Third surface, S4 Fourth surface

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  • Dispersion Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Nanotechnology (AREA)
PCT/JP2024/019529 2023-09-29 2024-05-28 気泡形成装置及び気泡形成方法 WO2025069563A1 (ja)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6256197U (enrdf_load_stackoverflow) * 1985-09-24 1987-04-07
JPH10146523A (ja) * 1996-09-20 1998-06-02 Nippon Shokubai Co Ltd 気液分散装置及び気液接触装置並びに廃水処理装置
WO2019168130A1 (ja) * 2018-02-28 2019-09-06 国立大学法人東京工業大学 マイクロ液滴・気泡生成デバイス

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Publication number Priority date Publication date Assignee Title
JP4151681B2 (ja) * 2005-07-19 2008-09-17 株式会社日立製作所 微細気泡生成装置及びその方法
JP6126729B2 (ja) * 2015-07-27 2017-05-10 丸福水産株式会社 混合処理体、混合処理法、流体混合器、気液混合処理装置、及び、魚介類養殖システム
WO2021166951A1 (ja) * 2020-02-17 2021-08-26 米島フエルト産業株式会社 積層材、中間シートの製造方法、及び、複合材の製造方法
JP6806941B1 (ja) * 2020-06-08 2021-01-06 株式会社エムテック 気液混合装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6256197U (enrdf_load_stackoverflow) * 1985-09-24 1987-04-07
JPH10146523A (ja) * 1996-09-20 1998-06-02 Nippon Shokubai Co Ltd 気液分散装置及び気液接触装置並びに廃水処理装置
WO2019168130A1 (ja) * 2018-02-28 2019-09-06 国立大学法人東京工業大学 マイクロ液滴・気泡生成デバイス

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