CN217887567U

CN217887567U - Microbubble generator for enhancing gas-liquid mixing

Info

Publication number: CN217887567U
Application number: CN202222295964.6U
Authority: CN
Inventors: 郭凯; 赵双飞; 胡润泽; 刘汉飞; 李双涛; 朱昊; 倪嵩波; 何伟
Original assignee: Nanjing Tech University
Current assignee: Nanjing Tech University
Priority date: 2022-08-30
Filing date: 2022-08-30
Publication date: 2022-11-25
Anticipated expiration: 2032-08-30

Abstract

The utility model discloses a microbubble generator for strengthening gas-liquid mixing, which comprises an internal fluid channel and a channel outer wall; the internal fluid channel comprises a gas phase zone, a bubble formation zone and a gas-liquid mixing zone; the channel outer wall wraps around the exterior of the internal fluid channel. Wherein, one side of the gas phase area is provided with a gas phase inlet, and the other side of the gas phase area is communicated with the bubble forming area; two sides of the bubble forming area are respectively communicated with the gas phase area and the gas-liquid mixing area, and the other two sides are respectively provided with a group of liquid phase inlets; gas-liquid mixture district one side and bubble formation district intercommunication, the opposite side is equipped with the microbubble delivery outlet. The microbubble generator directly utilizes the shearing force generated by the liquid-gas velocity ratio to generate bubbles, the liquid phase inlets can repeatedly shear the gas phase to enable the bubbles generated under the smaller gas-liquid velocity ratio to better meet the requirement of actual production, and the pressure outlets with the same width enable the generated bubbles to be more uniform and stable.

Description

Microbubble generator for enhancing gas-liquid mixing

Technical Field

The utility model belongs to the chemical reaction equipment field, concretely relates to strengthen gas-liquid mixture's microbubble generator.

Background

Microbubbles have important and widespread applications in the biomedical and pharmaceutical industries. The size and uniformity of the microbubbles directly affect the effectiveness of the application. In most microbubble application cases, it is always desirable to obtain microbubbles with smaller size and higher uniformity to improve the action.

Currently, the methods for generating microvesicles are as follows: (1) Micro bubbles are generated in micropores, so that the blockage phenomenon is easily generated under long-term operation, and the maintenance amount is required to be increased; (2) Cavitation generates microbubbles, the efficiency of generating microbubbles is not high, and the use is limited; (3) The fluid rotates to generate micro bubbles, has simple structure, and is one of micro bubble generating methods developed and used in Japan at present; (4) The flow velocity is changed to generate micro bubbles, the structure is simple, and the micro bubbles are easy to generate; (5) The pressure dissolving type microbubble generator consists of pressure dissolving tank, high pressure pump, water outlet nozzle, etc. The existing variable flow rate microbubble generator has the advantages of complex structure, high manufacturing cost, higher failure rate and inconvenient operation and maintenance, and greatly improves the use cost of users

At the present stage, the monodisperse micro-bubbles can be effectively generated by using the scale effect of the micro-channel, and meanwhile, the equivalent diameter of the micro-channel has an absolute control effect on the size of the micro-bubbles. Reducing the equivalent diameter of the micro-channels reduces the diameter of the micro-bubbles, but the manufacturing cost of the micro-bubble generator will be greatly increased, so it is particularly important to develop a simple and effective method for reducing the size of the micro-bubbles.

SUMMERY OF THE UTILITY MODEL

Utility model purpose: the utility model aims to solve the technical problem that to prior art not enough, provide a simple structure, form the little and stable of microbubble size, need not the novel microbubble generator of external energy source.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a microbubble generator for enhancing gas-liquid mixing comprises an internal fluid channel and a channel outer wall; the internal fluid passage comprises a gas phase zone, a bubble formation zone and a gas-liquid mixing zone; the channel outer wall wraps around the exterior of the inner fluid channel.

Wherein, one side of the gas phase area is provided with a gas phase inlet, and the other side is communicated with the bubble forming area; two sides of the bubble forming area are respectively communicated with the gas phase area and the gas-liquid mixing area, and the other two sides are respectively provided with a group of liquid phase inlets; one side of the gas-liquid mixing area is communicated with the bubble forming area, and the other side of the gas-liquid mixing area is provided with a micro-bubble output port.

Preferably, the gas phase zone is tapered, and the width of the gas phase zone is gradually reduced from one side of the gas phase inlet to the opposite side; the gas phase inlet is arranged on the top surface of one side of the gas phase area, and the cross section of the gas phase inlet is circular.

Furthermore, the cross section of one side of the gas phase zone, which is positioned at the gas phase inlet, is square with the width of 2 mm-4 mm, the cross section of the other side is trapezoidal, and the included angle of the joint of the two is 100-165 degrees; the diameter of the gas phase inlet is 0.3 mm-1.5 mm.

Specifically, the middle part of the bubble forming area is a through channel for connecting the gas phase area and the gas-liquid mixing area on two sides, and the two sides are provided with liquid phase channels which are perpendicular to the middle part through channel and communicated with the liquid phase inlet.

Preferably, the liquid phase channel is symmetrically distributed on two sides of the through channel, the cross section of the liquid phase channel is square, and the length of the liquid phase channel is 1 mm-3 mm.

Preferably, the liquid phase inlet is circular in cross section, 0.3 mm-1.5 mm in diameter and is respectively arranged on the top surfaces of the two sides of the bubble forming area.

Preferably, the gas-liquid mixing area is a long straight channel with the same width, the width range is 0.3 mm-3 mm, and the gas-liquid mixing area is communicated with the micro-bubble output port at the end part.

Preferably, the microbubble output port is circular in cross section, 0.3 mm-1.5 mm in diameter, and is arranged on the top surface outside the gas-liquid mixing area.

Preferably, the thickness of the outer wall of the channel is 0.9-6 mm; the depth of the internal fluid channel is 0.3 mm-2 mm.

Has the beneficial effects that:

the bubble forming area in the device is a convergence area of liquid flowing into through a plurality of liquid phase inlets and gas flowing into through a gas phase inlet, the liquid phase flow channel is mutually vertical to the gas phase flow channel, and the plurality of gas phase inlets are arranged, so that the liquid phase can cut the gas phase for a plurality of times, and the gas can be enabled to generate bubbles under a smaller liquid-gas velocity ratio. The liquid phase inlets are set to be the same in length, the liquid phase speed of each liquid phase inlet is kept consistent, the size of generated bubbles is more uniform, the gas-liquid mixing efficiency is improved, and the strengthening of the gas-liquid reaction process is realized. The shearing force generated by directly utilizing the liquid-gas velocity ratio generates bubbles, the gas phase can be sheared by the liquid phase inlets for multiple times to enable the bubbles to be generated under the smaller gas-liquid velocity ratio to meet the requirement of actual production better, the generated bubbles are more uniform and stable by the pressure outlets with the same width, the whole microbubble generator does not need the conditions of vacuum, pressurization, ultrasound, electrolysis and the like, the generated bubbles are more stable, the size is more uniform, and the microbubble generator has better application prospect in the aspects of chemical industry, medicine, environment and the like.

Drawings

These and/or other advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings.

Fig. 1 is a schematic top view of the microbubble generator.

Fig. 2 is a schematic side view of the microbubble generator.

Fig. 3 is a schematic three-dimensional structure of the microbubble generator.

FIG. 4 is a graph of bubbles generated by a microbubble generator under a CFD calculation simulation.

FIG. 5 is a graph of the effect of the surface tension magnitude on bubble generation magnitude obtained by a microbubble generator under CFD simulation.

FIG. 6 is a graph of the effect of gas-liquid velocity ratio on bubble generation size obtained by a microbubble generator under CFD simulation.

Wherein each reference numeral represents:

1 an internal fluid channel; 2, the outer wall of the channel; 11 gas phase region; 12 a bubble forming zone; 121 through the channel; 122 a liquid phase channel; 13 a gas-liquid mixing zone; 14 a gas phase inlet; 15 a liquid phase inlet; 16 micro bubble output ports.

Detailed Description

The invention will be better understood from the following examples.

The drawings in the specification show the structure, ratio, size, etc. only for the purpose of matching with the content disclosed in the specification, so as to be known and read by those skilled in the art, and not for the purpose of limiting the present invention, so the present invention does not have the essential meaning in the art, and any structure modification, ratio relationship change or size adjustment should still fall within the scope covered by the technical content disclosed in the present invention without affecting the function and achievable purpose of the present invention. Meanwhile, the terms "upper", "lower", "front", "rear", "middle", and the like used in the present specification are for the sake of clarity only, and are not intended to limit the scope of the present invention, and changes or adjustments of the relative relationship thereof are also considered to be the scope of the present invention without substantial changes in the technical content.

As shown in fig. 1 to 3, the microbubble generator for enhancing gas-liquid mixing is characterized by comprising an inner fluid passage 1 and a passage outer wall 2; the internal fluid passage 1 comprises a gas phase zone 11, a bubble formation zone 12 and a gas-liquid mixing zone 13; the channel outer wall 2 is wrapped around the interior fluid channel 1.

Wherein, one side of the gas phase zone 11 is provided with a gas phase inlet 14, and the other side is communicated with the bubble forming zone 12; two sides of the bubble forming area 12 are respectively communicated with the gas phase area 11 and the gas-liquid mixing area 13, and the other two sides are respectively provided with a group of liquid phase inlets 15; and one side of the gas-liquid mixing area 13 is communicated with the bubble forming area 12, and the other side of the gas-liquid mixing area is provided with a micro-bubble output port 16.

The microbubble generator generates bubbles by utilizing shearing force generated by liquid-gas velocity ratio, the liquid phase inlets 15 can shear gas phase for multiple times to enable the bubbles generated under smaller gas-liquid velocity ratio to meet the requirement of actual production, the generated bubbles are more uniform and stable by the pressure outlets with the same width, the whole microbubble generator does not need conditions of vacuum, pressurization, ultrasound, electrolysis and the like, the generated bubbles are more stable, and the sizes are more uniform.

The gas phase zone 11 adopts a tapered type, and the width of one side of the gas phase inlet 14 is gradually reduced towards the opposite side; the gas inlet 14 is provided on the top surface of the gas phase zone 11 side and has a circular cross-sectional shape.

The cross section of one side of the gas phase zone 11, which is positioned at the gas phase inlet 14, is square with the width of 2 mm-4 mm, the cross section of the other side is trapezoidal, and the included angle of the joint of the two is 100-165 degrees; the diameter of the gas phase inlet 14 is 0.3 mm-1.5 mm.

The middle part of the bubble forming area 12 is a through channel 121 which connects the gas phase area 11 and the gas-liquid mixing area 13 at two sides, two sides are provided with liquid phase channels 122 which are vertical to the middle through channel and are communicated with the liquid phase inlet 15, and two sides are respectively provided with 4. The liquid phase channels 122 are symmetrically distributed on two sides of the through channel 121, the cross section is square, and the length is 1 mm-3 mm. The liquid phase inlet 15 has a circular cross section with a diameter of 0.3mm to 1.5mm, and is respectively provided on the top surfaces of both sides of the bubble formation region 12.

In the bubble forming area 12, liquid flowing in from the liquid phase inlets 15 and gas flowing in from the gas phase inlets 14 are converged in the area, and the liquid phase shears the gas phase for multiple times, so that the gas is promoted to generate bubbles under a smaller liquid-gas velocity ratio, the gas-liquid mixing efficiency is improved, and the strengthening of the gas-liquid reaction process is realized.

The gas-liquid mixing area 13 is a long straight channel with the same width, the width range is 0.3 mm-3 mm, the gas-liquid mixing area is communicated with a micro-bubble output port 16 at the end part, bubbles formed from the bubble forming area 12 flow to the gas-liquid mixing area 13, and gas-liquid two phases are mixed and output in the gas-liquid mixing area 13.

The section of the microbubble output port 16 is circular, the diameter is 0.3 mm-1.5 mm, and the microbubble output port is arranged on the top surface of the outer side of the gas-liquid mixing area 13.

In the whole microbubble generator, the thickness of the outer wall 2 of the channel is 0.9 mm-6 mm; the depth of the internal fluid channel 1 is 0.3 mm-2 mm.

Example 1: CFD simulation calculation of bubble generation effect of microbubble generator

In this embodiment, the mixer comprises a gas phase inlet 14 and eight liquid phase inlets 15, and a micro-bubble outlet 16, as shown in fig. 1.

The thickness of the channel outer wall 2 is 1mm.

The whole length of the tapered gas phase zone 11 is 4mm, and the included angle of the square and trapezoid joint is 165 degrees.

The liquid phase inlet 15 has a diameter of 1mm and the liquid phase passage 122 has a length of 2mm.

The number of liquid phase inlets 15 is 10.

Taking liquid water with the density of 998.2kg/m ³ The fluid used as the liquid inlet 15 had a viscosity of 0.001003 kg/m.s and a Reynolds number of 5000.

Air is taken as a gas phase inlet 14 to flow in, and the density is 1.225kg/m ³ The viscosity is 1.7894e-05 kg/m.s.

Air enters from the gas phase inlet 14, and simultaneously liquid water also enters from each liquid phase inlet 15, because the liquid phase has higher speed than the gas phase, when the gas phase moves downwards from the upper part of the channel, the liquid phase meets the liquid water with higher flow speed, and therefore the liquid phase can generate shearing force to the gas phase, and because the channel is provided with a plurality of similar liquid phase inlets, the liquid phase can shear the gas phase for a plurality of times until the molecular acting force in the gas phase is overcome, and bubbles are generated.

As shown in FIG. 4, CFD simulation uses a VOF model to simulate bubble generation patterns. The part similar to cyan in the figure is bubbles formed by gas-liquid mixing, the middle part with reddish color is a gas enrichment area, and the gas content of the whole bubbles is more than 70 percent. As can be seen from the figure, the formed bubbles are uniform in size and similar to an ellipse in shape, the formed bubbles are stable in shape, the diameters of the simulated bubbles obtained through measurement and calculation are about 0.44mm after the average value of the diameters of a plurality of bubbles is taken, and the actual production requirements are met.

Example 2: CFD simulation explored the effect of surface tension on the size of the generated bubbles

Similarly, liquid water was taken as a liquid phase, air was taken as a gas phase, the liquid phase velocity was 4m/S, the number of liquid phase inlets was 12, the gas phase velocity was 1m/S, the surface tension coefficient between the gas phase and the liquid phase was adjusted to 0.01N/m, 0.03N/m, 0.05N/m, 0.07N/m, 0.09N/m, and then the average values of the diameters of the formed bubbles were measured, respectively, to obtain a graph of the surface tension (S) and the diameter (L) of the formed bubbles, as shown in FIG. 5. It can be seen from the figure that the diameter of the formed bubble gradually increases with the increase of the surface tension, and this conclusion is perfectly matched with the empirical formula, which not only shows that the microbubble generator can adapt to the surface tension coefficient of general liquid, but also sufficiently shows the accuracy of the simulation result, and can give qualitative conclusion to the design of the microbubble generator.

Example 3: CFD simulation explores the influence of gas-liquid velocity ratio on the size of generated bubbles

Similarly, liquid water was taken as a liquid phase, air was taken as a gas phase, the liquid phase velocity inlets were adjusted to 4m/s, 5m/s, 6m/s, 7m/s, and 8m/s, respectively, the number of liquid phase inlets was 8, and the gas phase velocity inlet was 1m/s, and then the average values of the diameters of the formed bubbles were measured, respectively, to obtain a graph of the gas-liquid velocity ratio (Q) and the diameter (L) of the formed bubbles, as shown in FIG. 6. As can be seen from the figure, as the gas-liquid velocity ratio is decreased, the diameter of the formed bubbles is gradually decreased, because when the liquid phase inlet velocity is increased, the shearing force of the liquid phase to the gas phase is also increased, so that bubbles with smaller diameter can be formed.

The utility model provides a think and method of strengthening gas-liquid mixture's microbubble generator specifically realizes that this technical scheme's method and approach are many, above only the utility model discloses a preferred embodiment should point out, to the ordinary skilled person in this technical field, not deviating from the utility model discloses under the prerequisite of principle, can also make a plurality of improvements and moist decorations, these improvements should also regard as with moist decorations the utility model discloses a protection scope. All the components not specified in this embodiment can be implemented by the prior art.

Claims

1. A microbubble generator for intensifying gas-liquid mixing is characterized by comprising an inner fluid channel (1) and a channel outer wall (2); the internal fluid channel (1) comprises a gas phase zone (11), a bubble formation zone (12) and a gas-liquid mixing zone (13); the channel outer wall (2) is wrapped outside the inner fluid channel (1);

one side of the gas phase area (11) is provided with a gas phase inlet (14), and the other side of the gas phase area is communicated with the bubble forming area (12); two sides of the bubble forming area (12) are respectively communicated with the gas phase area (11) and the gas-liquid mixing area (13), and the other two sides are respectively provided with a group of liquid phase inlets (15); one side of the gas-liquid mixing area (13) is communicated with the bubble forming area (12), and the other side of the gas-liquid mixing area is provided with a micro-bubble output port (16).

2. The microbubble generator for enhancing gas-liquid mixing according to claim 1, wherein the gas phase zone (11) is tapered such that a width thereof is gradually reduced from one side of the gas phase inlet (14) to the opposite side; the gas phase inlet (14) is arranged on the top surface of one side of the gas phase area (11), and the cross section of the gas phase inlet is circular.

3. The microbubble generator for enhancing gas-liquid mixing according to claim 2, wherein the gas phase zone (11) has a cross section at one side of the gas phase inlet (14) that is a square with a width of 2mm to 4mm, and a cross section at the other side that is a trapezoid, and an included angle at the junction of the two is 100 ° to 165 °; the diameter of the gas phase inlet (14) is 0.3 mm-1.5 mm.

4. The microbubble generator for enhancing gas-liquid mixing according to claim 1, wherein the bubble forming zone (12) has a through passage (121) in the middle connecting the gas phase zone (11) and the gas-liquid mixing zone (13) on both sides, and liquid phase passages (122) perpendicular to the through passage in the middle and communicating with the liquid phase inlet (15) are provided on both sides.

5. The microbubble generator for enhancing gas-liquid mixing according to claim 4, wherein the liquid phase passage (122) is symmetrically distributed at both sides of the penetration passage (121), has a square cross section, and has a length of 1mm to 3mm.

6. The microbubble generator for enhancing gas-liquid mixing according to claim 4, wherein the liquid phase inlet (15) has a circular cross-section with a diameter of 0.3mm to 1.5mm, and is opened on the top surface of both sides of the bubble forming region (12).

7. The microbubble generator for enhancing gas-liquid mixing according to claim 1, wherein the gas-liquid mixing zone (13) is a long straight channel with a constant width, the width of the channel ranges from 0.3mm to 3mm, and the channel is communicated with the microbubble outlet (16) at the end.

8. The microbubble generator for enhancing gas-liquid mixing according to claim 7, wherein the microbubble outlet (16) has a circular cross-section with a diameter of 0.3mm to 1.5mm and is provided on the top surface outside the gas-liquid mixing zone (13).

9. The microbubble generator for enhancing gas-liquid mixing according to claim 1, wherein the thickness of the channel outer wall (2) is 0.9mm to 6mm; the depth of the internal fluid channel (1) is 0.3 mm-2 mm.