CN115317960B - Method for precisely dividing bubbles and freely releasing sub-bubbles - Google Patents
Method for precisely dividing bubbles and freely releasing sub-bubbles Download PDFInfo
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- CN115317960B CN115317960B CN202210903626.8A CN202210903626A CN115317960B CN 115317960 B CN115317960 B CN 115317960B CN 202210903626 A CN202210903626 A CN 202210903626A CN 115317960 B CN115317960 B CN 115317960B
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- 238000000034 method Methods 0.000 title claims abstract description 11
- 230000003075 superhydrophobic effect Effects 0.000 claims abstract description 55
- 239000007788 liquid Substances 0.000 claims abstract description 7
- 230000009471 action Effects 0.000 claims abstract description 5
- 230000000694 effects Effects 0.000 claims description 4
- 239000000463 material Substances 0.000 abstract description 4
- 230000008859 change Effects 0.000 abstract description 3
- 238000002360 preparation method Methods 0.000 abstract description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 239000008213 purified water Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000005587 bubbling Effects 0.000 description 2
- 238000005188 flotation Methods 0.000 description 2
- 238000009291 froth flotation Methods 0.000 description 2
- 238000009776 industrial production Methods 0.000 description 2
- 239000002105 nanoparticle Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 238000001291 vacuum drying Methods 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 230000005514 two-phase flow Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D19/00—Degasification of liquids
- B01D19/02—Foam dispersion or prevention
Abstract
The invention discloses a method for precisely dividing bubbles and freely releasing sub-bubbles. The invention symmetrically arranges a pair of super-hydrophobic orbit wires in liquid, wherein a certain included angle theta is formed between the two orbit wires, and the bottom distance is smaller than the short axis of the bubble. When the bubbles are adhered between the track wires by contact of the bottoms of the track wires, under the action of buoyancy of the bubbles and adhesion force of the super-hydrophobic track wires, the bubbles spread along the super-hydrophobic track wires and slide upwards, and the shreds between the super-hydrophobic track wires divide the bubbles into two sub-bubbles which continue to slide along the track in a directional manner and finally separate from the track. The track device and the material related by the invention have simple preparation, low cost, flexible and convenient operation, can control bubble splitting as required, and do not need to change the shape and the quantity of the super-hydrophobic track wires. The invention can control the directional transportation of the sub-bubbles generated after splitting, and the sub-bubbles are easy to separate from the tail end of the track, thereby facilitating the subsequent treatment of the sub-bubbles.
Description
Technical Field
The invention relates to the field of multiphase flow and hydrodynamics, in particular to a method for precisely dividing bubbles and freely releasing sub-bubbles.
Background
The gas-liquid two-phase flow is a common multiphase flow system in nature, is closely related to our production and life, and flexible control of movement splitting of bubbles in liquid can play a great potential in industrial production, including bubbling reactors, froth flotation, electrolysis, sewage treatment and the like. For example, the bubble size in the fluid of the homogeneous bubble flow is relatively uniform and the rising speed is high, so that the efficiency of the bubbling reactor can be greatly improved; the bubbles are indispensable in the froth flotation process, and the recovery benefit of flotation is influenced by the specific surface area and residence time of the bubbles; the larger the specific surface area of the bubbles, the longer the residence time, the more beneficial the flotation of minerals, and conversely, the bubbles are not desirable in a heat exchange system, so that the precise control of the motion splitting of the bubbles takes a significant role in the transportation process of various industrial production.
Currently, in order to realize the control and splitting of bubbles, there is a method for controlling the splitting of bubbles based on-plane and on-filament superhydrophobic tracks, but in order to control the splitting result of bubbles, the shape or number of superhydrophobic tracks needs to be changed, which makes the operation too complicated, and in addition, the sub-bubbles generated by the splitting of bubbles on the plane tracks are difficult to release due to larger contact lines, i.e. the sub-bubbles are difficult to separate from the tracks, on the other hand, even if the sub-bubbles are released, larger volume loss exists, the spontaneous splitting of bubbles based on the tracks is very difficult, and the time required for splitting is relatively longer.
Disclosure of Invention
Aiming at the defects, the invention provides a method for precisely dividing bubbles and freely releasing sub-bubbles, which utilizes spreading and sliding of the bubbles on a super-hydrophobic track wire, applies acting force to the spread and sliding bubbles through shredding to enable the bubbles to be split, and enables the split sub-bubbles to still directionally slide along the track and release at the tail end of the track wire.
The technical scheme of the invention is as follows:
symmetrically arranging a pair of super-hydrophobic orbit wires in liquid, wherein a certain included angle theta is formed between the two orbit wires, and the bottom spacing is smaller than the short axis of the bubble;
when bubbles are adhered between the track wires by contact of the bottoms of the track wires, under the action of buoyancy of the bubbles and the adhesion force of the super-hydrophobic track wires, the bubbles spread along the super-hydrophobic track wires and slide upwards, and the shredding between the super-hydrophobic track wires breaks the bubbles into two sub-bubbles;
the sub-bubbles continue to directionally slide along the rail, and finally break away from the rail at the tip cone of the tail end of the rail wire;
controlling the sizes of sub-bubbles at two sides after splitting by controlling the positions of the shredding relative to the superhydrophobic tracks;
the splitting effect of the shredding on the bubbles is controlled by controlling the included angle theta between the super-hydrophobic orbit filaments, and the directional transportation of the sub-bubbles along the orbit after splitting is controlled.
Compared with the prior art, the invention has the beneficial effects that:
(1) The track device and the material related by the invention have simple preparation, low cost, flexible and convenient operation, can control bubble splitting as required, and do not need to change the shape and the quantity of the super-hydrophobic track wires.
(2) The invention can control the directional transportation of the sub-bubbles generated after splitting, and the sub-bubbles are easy to be released from the tail end of the track, thereby facilitating the subsequent treatment of the sub-bubbles.
(3) The time required for bubble division is relatively short in the present invention.
Drawings
FIG. 1 is a three-view of an experimental set-up for a superhydrophobic orbital wire;
fig. 2 is a superimposed graph of the motion splitting trace of bubbles with equivalent diameter of 3.57mm on a superhydrophobic orbital filament when the shredding position is far to the left and θ=20° with a time interval of 31.25ms;
fig. 3 is a superimposed graph of the trajectory of the motion splitting of a bubble with an equivalent diameter of 3.57mm on a superhydrophobic orbital filament with a time interval of 31.25ms, centered at the shredding position, θ=20°;
fig. 4 is a superimposed graph of the motion splitting trace of bubbles with equivalent diameter of 3.57mm on the superhydrophobic orbit filament when the shredding position is far to the right and θ=20° with a time interval of 31.25ms;
FIG. 5 is a graph showing the bubble splitting results as a function of shredding position for different track angles;
the reference numerals in the drawings are respectively: 1. purified water; 2. a water tank; 3. initial air bubbles; 4. a nozzle; 5. a fixed support; 6. a superhydrophobic rail wire; 7. shredding.
Detailed Description
The technical scheme in the invention will be described in detail below with reference to the accompanying drawings.
The invention particularly discloses a pair of super-hydrophobic orbit wires which are symmetrically arranged in liquid, a certain included angle theta is formed between the two orbit wires, the bottom distance is smaller than the short axis of the bubble, the tail end of the super-hydrophobic orbit wire is designed into a sharp cone shape, the diameter of the orbit wire is matched with the release requirement of bubbles with different sizes, and the phenomenon that the bubbles are directly separated from the orbit or fixedly adsorbed on the surface of the orbit due to the fact that the diameter of the orbit wire is not matched with the size of the bubble is avoided. When bubbles are adhered between the track wires by contact of the bottoms of the track wires, under the action of buoyancy of the bubbles and adhesion force of the super-hydrophobic track wires, the bubbles spread along the super-hydrophobic track wires and slide upwards, the shreds between the super-hydrophobic track wires fracture the bubbles into two sub-bubbles, the sub-bubbles continue to slide along the track in a directional manner, and finally, the sub-bubbles are separated from the track at the tip cone of the tail end of the track wires. Controlling the sizes of sub-bubbles at two sides after splitting by controlling the shredding position; the splitting effect of the shredding on the bubbles is controlled by controlling the included angle theta between the super-hydrophobic orbit filaments, and the orbit directional transportation of the sub-bubbles after splitting is controlled.
The included angle theta of the super-hydrophobic orbit wire is 0-180 degrees.
The shredding can be a string, a bent thin rod or a thin sheet;
the diameter of the super-hydrophobic orbit wire is determined by the volume of released bubbles;
the super-hydrophobic track wire can be an object with the self super-hydrophobic characteristic, or can be a substrate made of non-super-hydrophobic material, and a layer of super-hydrophobic material is sprayed on the surface of the super-hydrophobic track wire;
examples:
in the example, one end of the stainless steel wire with the diameter of 1.5mm is polished and sharp, the stainless steel wire is bent to different angles by using tools such as pliers, an angle gauge and the like, the bent stainless steel wire is washed by deionized water, the surface of the stainless steel wire is repeatedly wiped by using dust-free paper soaked in absolute ethyl alcohol, impurities on the surface of the stainless steel wire are ensured to be removed, and the stainless steel wire is dried by clean compressed air.
Uniformly spraying a super-hydrophobic nanoparticle solution Glaco on the surface of a stainless steel wire, standing for a period of time after spraying, placing the stainless steel wire in a vacuum drying oven for 20 minutes, uniformly attaching nanoparticles in the super-hydrophobic solution to the surface of the stainless steel wire to form a super-hydrophobic coating, cooling the track wire to room temperature, and repeating the operation for three times to obtain the super-hydrophobic track wire 6 with excellent hydrophobicity; setting temperature parameters in a vacuum drying oven: 160 ℃.
As shown in fig. 1, the fixing support 5 is placed on two sides of the nozzle 4, the superhydrophobic rail wires 6 are symmetrically placed on the fixing support 5, the bottom space of the superhydrophobic rail wires 6 is ensured to be smaller than the short axis of the initial bubble 3, purified water 1 is filled in the water tank 2, a uniform air film is attached to the surface of the superhydrophobic rail wires 6 in the purified water 1, and the shreds 7 (in this example, the shreds are curved L-shaped) are arranged at proper positions, so that one ends of the shreds 7 vertically penetrate through the included angle plane of the superhydrophobic rail wires 6.
The bubble generating device formed by the injection pump and the needle nozzle generates initial bubbles 3 below the super-hydrophobic track wires 7, when the initial bubbles 3 are contacted with the bottoms of the super-hydrophobic track wires 6, the super-hydrophobic track wires show that super-hydrophilic bubbles are adsorbed between the two super-hydrophobic track wires 6 in liquid, and under the action of the adhesive force of the super-hydrophobic track wires 6 and the buoyancy of the bubbles, the bubbles spread along the super-hydrophobic track wires 6 and slide upwards, so that the bubbles are split into two sub-bubbles by the shredding 7. The sub-bubbles still directionally slide along the super-hydrophobic track wires 6 and are finally released by the separation of the track tail ends.
Under the working condition that the shredding position is far left, θ=20°, and the equivalent diameter of the air bubble is 3.57mm, the initial air bubble is split into two sub-air bubbles with small volume left side and large volume right side by shredding, see fig. 2;
under the working condition that the shredding position is centered, θ=20°, and the equivalent diameter of the air bubble is 3.57mm, the initial air bubble is split into two sub-air bubbles with equal volumes at two sides by shredding, and the initial air bubble is shown in fig. 3;
under the working condition that the shredding position is far to the right, θ=20°, and the equivalent diameter of the air bubble is 3.57mm, the initial air bubble is split into two sub-air bubbles with larger volume on the left side and smaller volume on the right side by shredding, as shown in fig. 4;
the equivalent diameter of the bubble is 3.57mm, and the change of the volume of the sub-bubble along with the shredding position after splitting at θ=20°, 10 ° and 0 ° is shown in fig. 5; the abscissa in the figure is the shredding position, and is expressed by the ratio (x/L) of the lateral movement distance of shredding to the movement range (the shredding moves laterally from left to right), and the ordinate is the bubble volume, and is expressed by the ratio (V/V) of the volume of one side sub-bubble after splitting to the volume of the initial bubble; l represents the left sub-bubble after splitting; 20. and 10 and P respectively correspond to 20 degrees, 10 degrees and 0 degree of theta.
Claims (3)
1. A method for precisely dividing bubbles and freely releasing sub-bubbles is characterized by comprising the following steps:
symmetrically arranging a pair of super-hydrophobic orbit wires in liquid, wherein a certain included angle theta is formed between the two orbit wires, and the bottom spacing is smaller than the short axis of the bubble;
when bubbles are adhered between the track wires by contact of the bottoms of the track wires, under the action of buoyancy of the bubbles and the adhesion force of the super-hydrophobic track wires, the bubbles spread along the super-hydrophobic track wires and slide upwards, and the shredding between the super-hydrophobic track wires breaks the bubbles into two sub-bubbles;
the sub-bubbles continue to directionally slide along the rail, and finally break away from the rail at the tip cone of the tail end of the rail wire;
controlling the sizes of sub-bubbles at two sides after splitting by controlling the positions of the shredding relative to the superhydrophobic tracks;
controlling the splitting effect of the shredding on the bubbles and controlling the directional transportation of the sub-bubbles along the tracks after splitting by controlling the included angle theta between the super-hydrophobic track filaments; the splitting effect refers to the ratio of the volume of one side sub-bubble after splitting to the volume of the initial bubble.
2. The method according to claim 1, characterized in that: the included angle theta of the super-hydrophobic orbit wire is more than 0 degrees and less than 180 degrees.
3. The method according to claim 1, characterized in that: the shreds are strings, bent thin rods or thin sheets.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210903626.8A CN115317960B (en) | 2022-07-29 | 2022-07-29 | Method for precisely dividing bubbles and freely releasing sub-bubbles |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210903626.8A CN115317960B (en) | 2022-07-29 | 2022-07-29 | Method for precisely dividing bubbles and freely releasing sub-bubbles |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115317960A CN115317960A (en) | 2022-11-11 |
| CN115317960B true CN115317960B (en) | 2024-01-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210903626.8A Active CN115317960B (en) | 2022-07-29 | 2022-07-29 | Method for precisely dividing bubbles and freely releasing sub-bubbles |
Country Status (1)
| Country | Link |
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| CN (1) | CN115317960B (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1119456A (en) * | 1997-07-04 | 1999-01-26 | Babcock Hitachi Kk | Gaseous nh3 dilution tank |
| JP2008290050A (en) * | 2007-05-28 | 2008-12-04 | Panasonic Electric Works Co Ltd | Fine bubble generator and fine bubble generating method |
| CN110251999A (en) * | 2019-05-15 | 2019-09-20 | 中国计量大学 | The method of super-hydrophobic track regulation bubble splitting in plane |
| CN110652893A (en) * | 2019-09-17 | 2020-01-07 | 李常德 | Microbubble generating device and bubble segmentation component |
| CN111548024A (en) * | 2020-05-22 | 2020-08-18 | 中国计量大学 | Method for splitting bubbles by monofilaments on in-plane superhydrophobic rail |
| CN112156896A (en) * | 2020-10-13 | 2021-01-01 | 中国计量大学 | Method for controlling rising of bubbles in liquid by using super-hydrophilic yarn track |
| CN112169609A (en) * | 2020-09-25 | 2021-01-05 | 中国计量大学 | Method for generating micro-bubbles by super-hydrophobic network on open wall surface |
| CN112957934A (en) * | 2020-12-25 | 2021-06-15 | 广州易能克科技有限公司 | Bubble cutting device |
| CN113318620A (en) * | 2021-05-20 | 2021-08-31 | 中国计量大学 | Method for controlling bubble splitting and sliding by using super-hydrophilic filaments |
-
2022
- 2022-07-29 CN CN202210903626.8A patent/CN115317960B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1119456A (en) * | 1997-07-04 | 1999-01-26 | Babcock Hitachi Kk | Gaseous nh3 dilution tank |
| JP2008290050A (en) * | 2007-05-28 | 2008-12-04 | Panasonic Electric Works Co Ltd | Fine bubble generator and fine bubble generating method |
| CN110251999A (en) * | 2019-05-15 | 2019-09-20 | 中国计量大学 | The method of super-hydrophobic track regulation bubble splitting in plane |
| CN110652893A (en) * | 2019-09-17 | 2020-01-07 | 李常德 | Microbubble generating device and bubble segmentation component |
| CN111548024A (en) * | 2020-05-22 | 2020-08-18 | 中国计量大学 | Method for splitting bubbles by monofilaments on in-plane superhydrophobic rail |
| CN112169609A (en) * | 2020-09-25 | 2021-01-05 | 中国计量大学 | Method for generating micro-bubbles by super-hydrophobic network on open wall surface |
| CN112156896A (en) * | 2020-10-13 | 2021-01-01 | 中国计量大学 | Method for controlling rising of bubbles in liquid by using super-hydrophilic yarn track |
| CN112957934A (en) * | 2020-12-25 | 2021-06-15 | 广州易能克科技有限公司 | Bubble cutting device |
| CN113318620A (en) * | 2021-05-20 | 2021-08-31 | 中国计量大学 | Method for controlling bubble splitting and sliding by using super-hydrophilic filaments |
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| Publication number | Publication date |
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| CN115317960A (en) | 2022-11-11 |
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