阅读说明：本技术 锥螺旋气泡输运装置及其制备方法 (Conical spiral bubble conveying device and preparation method thereof ) 是由 吴化平 卓江山 徐璞 杨哲 于 2019-10-31 设计创作，主要内容包括：锥螺旋气泡输运装置,包括一支锥螺旋体,锥螺旋体从起始端开始向上逐渐缩小至收束端,锥螺旋体的起始端为一倾斜正四边形,正四边形的竖直边沿锥螺旋向上逐渐增大。气泡直径要大于锥螺旋体内侧面的高度,楔角才能对气泡产生拉普拉斯力,同时锥螺旋的曲率对气泡产生曲率驱动力,在两个力的共同作用下,利用本发明,气泡可以被驱动着向锥顶运动。实现对气泡的反重力及反浮力的运输。(The conical spiral bubble conveying device comprises a conical spiral body, the conical spiral body is gradually reduced from a starting end to a convergence end, the starting end of the conical spiral body is an inclined positive quadrilateral, and the vertical edge of the positive quadrilateral is gradually increased upwards in a conical spiral manner. The diameter of the air bubble is larger than the height of the inner side surface of the conical spiral body, the wedge angle can generate Laplace force on the air bubble, meanwhile, the curvature of the conical spiral generates curvature driving force on the air bubble, and under the combined action of the two forces, the air bubble can be driven to move towards the conical top by utilizing the conical spiral device. The transportation of the antigravity and the antibuoyancy of the bubbles is realized.)

1. The conical spiral bubble conveying device comprises a conical spiral body and is characterized in that the conical spiral body is gradually reduced from a starting end to a convergence end, the starting end of the conical spiral body is an inclined positive quadrilateral, and the vertical edge of the positive quadrilateral is gradually increased upwards in a conical spiral manner.

2. The conical helical bubble transport device according to claim 1, wherein the number of turns of the conical helical body is 5-7.

3. The preparation method of the conical spiral bubble conveying device comprises the following steps:

preparing a three-dimensional conical spiral body by using a 3D printer;

step two, preparing a rough micro-nano structure: scanning the surface of the conical spiral body by femtosecond laser to obtain a rough micrometer structure;

step three, preparing a super-hydrophobic substrate: dipping a proper amount of super-hydrophobic solution by using a brush, uniformly coating the super-hydrophobic solution on the inner surface of the conical spiral body, putting the sample on a drying table adjusted to 60 ℃ for drying, standing for 15 minutes and ensuring that the solvent is completely volatilized, and then repeatedly dipping, coating and drying for five times;

and step four, dripping the lubricant, blowing and wiping the surface by electric air blowing to remove the redundant lubricant, and forming a layer of lubricating film on the surface of the substrate.

Technical Field

The invention relates to a bubble conveying device and a preparation method thereof, in particular to a conical spiral bubble conveying device and a preparation method thereof.

Background

The generation, controllable collection and directional transportation of bubbles play an important role in many modern science and technology fields. Such as air bubbles, have important applications in many natural and technological processes, such as in polymerization, dispersion, extraction, detergent and cosmetic production, and liquid boiling and condensation processes; in the liquid environment, the bubbles have important application in the fields of four-dimensional color ultrasonography, material transfer, particle flotation, water purification, electrochemistry, corrosion prevention, drag reduction and the like.

How to realize antigravity self-conveying of bubbles in an air environment, overcoming the action of gravity, changing the conveying direction and speed of the bubbles and relating to the application of the bubbles in a three-dimensional space in the air environment.

Also, in a liquid environment, it is inherently difficult to achieve effective directional transport control for bubbles of large diameter, which rise rapidly in the liquid medium due to the large buoyancy effect. Due to the buoyancy vertically upwards, the bubbles will move straight upwards and eventually be released into the atmosphere. Thus, industrial and agricultural processes involve the treatment of gas bubbles, such as wastewater treatment and flotation recovery of fine mineral particles, often using their buoyancy. In addition, when the presence of bubbles causes adverse effects, such as CO in an aqueous medium₂Or H₂The S microbubbles accelerate the hydrogenation of the metal and form hydrogen pores on the surface, which in turn causes severe corrosion of the pipes and shortens the life of the equipment, and most of the conventional methods selected for eliminating bubbles utilize buoyancy, including chemical and physical methods, but their elimination of bubbles in complex spatial structures often requires anti-buoyancy operations.

Disclosure of Invention

In order to solve the problems in the prior art, the invention provides the conical spiral bubble conveying device which is simple in structure and can adjust the bubble conveying direction, speed and distance through different parameter settings.

In order to achieve the purpose, the invention adopts the following technical scheme:

the conical spiral bubble conveying device comprises a conical spiral body, the conical spiral body is gradually reduced from a starting end to a convergence end, the starting end of the conical spiral body is an inclined positive quadrilateral, and the vertical edge of the positive quadrilateral is gradually increased upwards in a conical spiral manner.

In the conical spiral bubble conveying device, the number of the conical spiral body is 5-7.

The preparation method of the conical spiral bubble conveying device comprises the following steps:

preparing a three-dimensional conical spiral body by using a 3D printer;

step two, preparing a rough micro-nano structure: scanning the surface of the conical spiral body by femtosecond laser to obtain a rough micrometer structure;

step three, preparing a super-hydrophobic substrate: dipping a proper amount of super-hydrophobic solution by using a brush, uniformly coating the super-hydrophobic solution on the inner surface of the conical spiral body, putting the sample on a drying table adjusted to 60 ℃ for drying, standing for 15 minutes and ensuring that the solvent is completely volatilized, and then repeatedly dipping, coating and drying for five times;

and step four, dripping the lubricant, blowing and wiping the surface by electric air blowing to remove the redundant lubricant, and forming a layer of lubricating film on the surface of the substrate.

The conical spiral body of the invention is unfolded along a straight line, and the inner wall of the conical spiral body has a wedge angle of

And the size of the wedge shape is gradually increased from the bottom to the cone top.

The conical helix is gradually reduced from the bottom to the conical top, so that the curvature gradient is larger and larger, and the larger the change rate of the curvature is, the stronger the generated curvature driving force is.

The diameter of the air bubble is larger than the height of the inner side surface of the conical spiral body, the wedge angle can generate Laplace force on the air bubble, meanwhile, the curvature of the conical spiral generates curvature driving force on the air bubble, and under the combined action of the two forces, the air bubble can be driven to move towards the conical top by utilizing the conical spiral device.

The same transportation distance, namely the distance from the bottom to the top of the conical helix for transporting the bubbles is the same, namely under the condition that the height of the conical helix is certain, the more the number of turns of the conical helix is, the larger the distance for the bubbles to travel, so that the number of turns of the conical helix is as small as possible within a certain transportation distance; however, the speed of the bubbles is limited due to the small number of turns, so the number of turns must be controlled within a certain range, and the speed of the bubbles, the passing time and the distance meet the requirements of transportation. Through the experiment, the number of turns of the conical helix is optimal when 5-7 turns are carried out, the air bubbles can be transported for a specified distance, the transporting speed of the air bubbles can meet the requirement, and meanwhile the transporting time of the air bubbles can be controlled.

In a liquid environment, a super-hydrophobic substrate is prepared on the surface of the conical helix, so that bubbles can be adsorbed on the inner surface of the conical helix. And a lubricant is dripped on the surface of the conical spiral body, so that the transportation friction force of bubbles can be reduced.

HFE7100 can be used as a lubricant, which is composed of methyl nonafluorobutyl ether, has low surface tension and low viscosity, and can reduce viscous resistance during air bubble transportation.

The invention has the beneficial effects that:

1) in a working environment, the wedge-shaped Laplace force and the curvature driving force are combined into a bubble driving force to drive the bubbles to move towards the top along the wedge-shaped conical helix, so that antigravity operation can be realized, and for example, the bubbles can be conveyed by obliquely placing the invention.

2) By adjusting the vertical side length of the quadrilateral of the section of the conical helixL ₁、L ₂The size of the wedge angle of the wedge can be changed, and the size of the Laplace force can be adjusted; by appropriate adjustment of the angle of taper of the conical helixα ₂Pitch of the conic helixhThe radius r of the conical helix can change the curvature of the conical helix, and further the curvature driving force is adjusted; inclination angle between quadrangle of conic spiral section and Z axisα ₁Determines the division of the driving force in the radial and axial directions by varyingα ₁To vary the relative magnitudes of the radial and axial driving forces.

The invention can adapt to the transportation requirements of bubbles with different volumes, different transportation speeds and different transportation distances by adjusting the structural parameters.

3) In a liquid working environment, the radial driving force drives the bubbles to move along the wedge-shaped conical spiral body towards the cone top direction. If the cone top is inclined even downwards, the anti-buoyancy operation can be realized, and a series of adverse effects such as corrosion of the metal device by bubbles can be eliminated.

4) The invention is suitable for transporting bubbles with a complex space structure.

Drawings

FIG. 1 is a schematic view of the structure of the present invention.

Fig. 2 is a schematic structural view of the present invention with a base installed.

Fig. 3 is a graph of the effect of different curvature gradients on transport conditions in an air environment.

Fig. 4 illustrates the effect of different wedge angles on transport conditions in an air environment.

Fig. 5 is a schematic diagram of a lateral transport process of bubbles in a liquid environment.

Fig. 6 shows the effect of different curvature gradients on transport conditions in a liquid environment.

Fig. 7 shows the effect of different wedge angles on transport conditions in a liquid environment.

Fig. 8 is a schematic diagram of the top-down transport process of bubbles in a liquid environment.

Detailed Description