High-efficiency bubble transporter, device and manufacturing method based on super-hydrophobic cross-track array

Abstract

The present invention discloses an efficient bubble transporter, device and manufacturing method based on a super-hydrophobic cross-track array. An efficient bubble transporter in the present invention is provided with a super-hydrophobic track on a base material, and the super-hydrophobic track is distributed in an array to increase the sliding speed of bubbles. An efficient bubble transport device in the present invention comprises at least one transporter, and the spacing of the base materials is adjusted to increase the capture rate of freely rising bubbles. The bubble transporter involved in the present invention is simple to prepare, low in cost and can be reused. The present invention controls the cross-track bubbles to continue to rise along the track path and maintain a very fast rising speed. The present invention can change the capture ratio of cross-track bubbles by adjusting the spacing size of the base materials, thereby accelerating the process of bubble transport.

Description

Technical Field

[0001] The invention relates to the control of the motion trajectory of cross-track bubbles in water or aqueous solution, and in particular to a high-efficiency bubble transporter, a device and a manufacturing method based on a super-hydrophobic cross-track array. Background Art

[0002] The directional movement of bubbles in liquid is a typical problem in gas-liquid two-phase flow. It is widely used in engineering equipment and technology fields such as petrochemicals, energy, shipbuilding, and sewage treatment. The control of rising bubbles in liquid fluids is crucial for bubble reactors, sewage treatment, hydraulic drag reduction, microfluidics, microreactor technology, and biological cell incubation. For example, bubble reactors require that bubbles are evenly distributed during the rising process, with both a large speed and specific surface area, so that the reaction efficiency of the bubble reactor can be fully released; in foam flotation, the longer the bubble stays in the liquid phase and the longer the movement history, the more beneficial it is for mineral attachment and flotation; in microfluidics and heat exchange systems, bubbles need to leave the liquid phase faster, so how to control the sliding speed and path of bubbles has become the key to these fields.

[0003] When bubbles move in liquid, they are caused to move and disturb the flow field under the action of buoyancy, gravity and other forces. The flow field in turn reacts on the bubbles, making their movement in the liquid very complicated and their rising trajectory difficult to control.

[0004] Most current studies use a superhydrophobic single track for bubble collection. In the process of collecting large bubbles, the track width increases and its rising speed decreases accordingly. Therefore, it is necessary to develop a device with a simple preparation process, low cost and that can effectively increase the sliding speed of large bubbles to meet the actual needs of the above-mentioned engineering. Summary of the invention

[0005] The present invention provides a bubble transporter, a device and a manufacturing method which can accelerate the rising speed of cross-track bubbles in water and effectively control the rising path.

[0006] A first aspect of the present invention provides a high-efficiency bubble transporter, wherein a super-hydrophobic track is arranged on a base material, and the super-hydrophobic track is distributed in an array to increase the sliding speed of the bubble.

[0007] A second aspect of the present invention provides a highly efficient bubble transport device comprising at least one transporter for adjusting the spacing of substrate materials to increase the capture rate of free-rising bubbles.

[0008] The third aspect of the present invention provides a method for making a transporter, specifically:

[0009] A super-hydrophobic coating is sprayed on the surface of the substrate;

[0010] A plurality of hydrophilic regions are formed on the surface of the substrate by engraving technology, and the non-hydrophilic regions constitute a super-hydrophobic track array.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] (1) The bubble transporter of the present invention is simple to prepare, low in cost and can be reused.

[0013] (2) The present invention controls the cross-orbital bubble to continue to rise along the orbital path and maintain a very fast rising speed.

[0014] (3) The present invention can change the capture ratio of cross-track bubbles by adjusting the spacing size of the substrate material, thereby accelerating the bubble transport process.

[0015] (4) The present invention is applicable to a wide range of bubble group density, and can achieve rapid bubble transport on a single track or across tracks regardless of the density of the bubble group. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a front view schematic diagram of a high-efficiency bubble transporter;

[0017] Figure 2 Schematic diagram of the experimental device for cross-track transportation;

[0018] Figure 3 This is a schematic diagram of a large-scale bubble transporter;

[0019] Figure 4 It is the front view of the floating trajectory of bubbles across the track with different sizes of L=3mm;

[0020] Figure 5 This is the front view of the floating trajectory of bubbles across the track with different sizes of L=2mm. DETAILED DESCRIPTION

[0021] The present invention will be further described below with reference to the accompanying drawings and examples.

[0022] In order to effectively control the trajectory and speed of bubbles across tracks, the technical solution of the present invention is: a super-hydrophobic coating is sprayed on the surface of a substrate, and multiple hydrophilic areas are scraped on the surface of the substrate by engraving technology to form a super-hydrophobic track array. The speed of bubbles rising along a single track can be adjusted by changing the width W of the array track, and the capture rate of free-rising bubbles can be increased by adjusting the spacing L of the substrate material.

[0023] The bubbles generated below the substrate material can easily enter the working area of ​​the bubble transporter under the guidance of the guide plate of the present invention. Most of the bubbles in the area are captured by the super-hydrophobic track and adhere to the track. Under the action of fluid drag and buoyancy, the bubbles adhered to the track will obtain a greater rising speed and can rise along a single track or across multiple tracks. A small number of bubbles still rise freely. The freely rising bubbles are either absorbed into the sliding bubbles (merging) or pushed upward by the bubbles colliding head-on (no merging) to achieve a faster rising speed. The bubbles across the tracks are larger in scale, and even if free bubbles are merged, a very fast rising speed can be maintained, thereby enhancing gas-liquid separation.

[0024] Preferably, the substrate material may be made of glass, silicon wafer, metal, plastic or the like; the track spacing and number of the array super-hydrophobic tracks may be different; the paths of the super-hydrophobic tracks may be of different shapes; the super-hydrophobic tracks may be linear or non-linear; Example

[0025] like Figure 1 As shown, in order to ensure that the bubbles have good adhesion ability on the base material 1, the present embodiment forms a super-hydrophobic surface layer with good hydrophobic performance of about 0.1mm thickness on the surface of the base material. First, the surface is cleaned, and a plurality of array super-hydrophobic tracks with a width of W are reserved on the surface of the base material. The width and shape of the array track can be different under the premise that the boundaries of the tracks are parallel to each other, and then the base material is sprayed with a super-hydrophobic solution to obtain a super-hydrophobic coating 2 with a smooth surface. Further, in order to significantly improve the hydrophobic performance of the surface of the base material, a guide plate 3 with a certain inclination is pasted on the base material to form a bubble transporter, and a porous material is placed directly below the guide plate to ensure that the bubble group 4 generated by the porous material can flow into the base material through the guide plate and guide the single track and cross-track bubbles to continue to rise.

[0026] like Figure 2 As shown, a bubble transporter is placed in parallel with a base material in a water tank 5 to form a bubble transport device, wherein the base material plays a role of drainage, compressing compressed air into the porous material to generate bubble groups of different sizes, and the generated bubbles are easily guided by the guide plate to enter the base material, so that most of the bubbles in the bubble group are captured by the array super-hydrophobic track, while a small part of the bubbles still rise freely. The captured bubbles sliding on the track are accelerated to slide upward in a straight line on the track under the action of buoyancy, thereby achieving the capture and transportation of the bubble group. In addition, Figure 3 As shown, increasing the number of bubble transporters can also achieve efficient collection of large-scale bubble groups.

[0027] Figure 4As shown in the figure, when L=3mm, the front view of the floating trajectory of bubble groups of different sizes shows that the terminal velocities of free-rising bubble 6, large bubble 7 and small bubble 8 sliding on the super-hydrophobic track are 0.32m / s, 0.41m / s and 0.73m / s respectively. Therefore, it is obvious that the bubble transporter can significantly increase the rising speed of bubbles.

[0028] Besides, bubble fusion can be enhanced by utilizing bubble transporters. Once two adjacent bubbles of different sizes slip along overlapping paths, the trailing bubble, which is smaller than the leading bubble, will approach the leading bubble and then merge, while the smaller leading bubble will move away from the larger trailing bubble and no merging will occur. In addition, the slip bubbles also greatly affect the free-rising bubbles. The faster slip bubbles will catch up with the slower free-rising bubbles and collide with them. After the collision event, these free-rising bubbles may have two fates. They can either be absorbed into the slip bubble or be pushed upward by the head-on colliding bubble to achieve a faster rising speed.

[0029] The above results indicate that both the bubble-bubble interaction and track-bubble interaction mechanisms lead to faster bubble rise in the bubble transporter. Figure 5 As shown in the front view of the floating trajectory of bubble groups of different sizes when L=2mm, when the distance L between the two plates decreases from 3mm to 2mm, the freely rising bubbles are significantly reduced, and the bubbles rising across the track are significantly increased, thereby further increasing the proportion of captured bubbles and accelerating the entire transportation process of the bubbles.

[0030] Therefore, in summary, the bubble transporter can effectively control the floating speed and path of the bubble group by reasonably adjusting the shape and width of the array superhydrophobic track. During the floating process, there is no additional energy input, and the bubbles can be controlled to accelerate floating along multiple tracks. Therefore, this method has great use value in the fields of multiphase flow and fine chemicals.

Claims

1. A high-efficiency bubble transporter, characterized in that: A super-hydrophobic track is arranged on a base material, and the super-hydrophobic track is distributed in an array to increase the sliding speed of bubbles; the transporter is manufactured in the following manner: A super-hydrophobic coating is sprayed on the surface of the substrate; A plurality of hydrophilic regions are formed on the surface of the substrate by engraving technology, and the non-hydrophilic regions constitute a super-hydrophobic track array.

2. A high-efficiency bubble transporter according to claim 1, characterized in that: The width of the track is adjusted to adjust the speed at which the bubbles rise along the single track.

3. A high-efficiency bubble transporter according to claim 1, characterized in that: A guide plate is arranged at the lower part of the base material.

4. A high-efficiency bubble transporter according to any one of claims 1 to 3, characterized in that: The substrate material is glass, silicon wafer, metal or plastic.

5. A high-efficiency bubble transporter according to any one of claims 1 to 3, characterized in that: The paths of the super-hydrophobic tracks are of different shapes.

6. A high-efficiency bubble transport device, comprising at least one transporter according to any one of claims 1 to 5, characterized in that: Adjusting the spacing of the substrate materials is used to increase the capture rate of free-rising bubbles.

7. A method for manufacturing a transporter according to any one of claims 1 to 5, characterized in that: A super-hydrophobic coating is sprayed on the surface of the substrate; A plurality of hydrophilic regions are formed on the surface of the substrate by engraving technology, and the non-hydrophilic regions constitute a super-hydrophobic track array.

8. The method according to claim 7, characterized in that: The substrate material is glass, silicon wafer, metal or plastic.

9. The method according to claim 7, characterized in that: The paths of the super-hydrophobic tracks are of different shapes.

10. The method according to claim 9, characterized in that: The super hydrophobic track is linear.

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