阅读说明：本技术 一种用于气泡输运的楔形螺旋曲面装置 (Wedge-shaped spiral curved surface device for transporting bubbles ) 是由 吴化平 徐璞 卓江山 杨哲 于 2019-10-18 设计创作，主要内容包括：一种用于气泡输运的楔形螺旋曲面装置,包括基底,在基底上开设有阿基米德螺线曲面,阿基米德螺线曲面带有楔角,极角越小、宽度越大。本发明,当气泡直径大于楔形曲面的宽度时,阿基米德螺旋线产生的曲率驱动力与楔形面产生的拉普拉斯力共同对气泡进行运输；当楔形曲面宽度大于气泡直径时,阿基米德螺旋线产生的曲率驱动力仍可以运输气泡。本发明可以实现气泡的高速定向输运,以适应气泡在工业、医学、环境工程等方面的应用。(A wedge-shaped spiral curved surface device for transporting bubbles comprises a substrate, wherein an Archimedes spiral curved surface is arranged on the substrate, the Archimedes spiral curved surface is provided with a wedge angle, and the smaller the polar angle is, the larger the width is. According to the invention, when the diameter of the air bubble is larger than the width of the wedge-shaped curved surface, the air bubble is transported by the curvature driving force generated by the Archimedes spiral line and the Laplace force generated by the wedge-shaped surface together; when the width of the wedge-shaped curved surface is larger than the diameter of the bubble, the bubble can still be transported by the curvature driving force generated by the Archimedes spiral. The invention can realize the high-speed directional transportation of the bubbles so as to adapt to the application of the bubbles in the aspects of industry, medicine, environmental engineering and the like.)

1. A wedge-shaped spiral curved surface device for transporting bubbles comprises a substrate and is characterized in that an Archimedes spiral curved surface is arranged on the substrate, the Archimedes spiral curved surface is provided with a wedge angle, and the smaller the polar angle is, the larger the width is.

2. The wedge-shaped helical curving device for transporting bubbles according to claim 1, wherein the curve θ of the Archimedes spiral curve has a value between 0 and π.

3. A wedge-shaped helical curved device for transport of gas bubbles according to claim 1, wherein the wedge angle is 4-12 degrees.

Technical Field

The invention relates to a bubble conveying device, in particular to a wedge-shaped spiral curved surface device for conveying bubbles.

Background

Control of bubble behavior is important for biomedical and industrial processes where bubbles are used as contrast agents or delivery vehicles, which also affect the chemical reactions and energy conversion systems that generate, collect, and store bubbles.

Several forms for self-driven transportation of bubbles are available, for example, one-way transportation and path selection are realized by using buoyancy on a plane structure substrate, anti-buoyancy transportation is realized by using asymmetric substrates such as wedges, cones and the like, and adhesion and directional transportation of microbubbles are solved. However, the problem of low initial speed of bubble self-transportation on a curved surface has not been solved, and the problem that the long distance of the wedge does not coexist with high speed also exists, which is extremely disadvantageous to the manipulation of bubbles on the curved surface or the wedge.

The wedge-shaped surface is set to be larger if the bubble conveying speed is high, but the diameter of the bubble must be larger than that of the wedge-shaped surface in the bubble conveying process, so that the wedge-shaped surface must be larger if the bubble conveying speed is high in the bubble conveying process, but the wedge angle is larger, and the distance between the wedge-shaped surfaces is smaller under the condition that the bubble diameter is constant. Thereby causing a problem that the distance of the wedge-shaped face does not coexist with the speed.

Disclosure of Invention

In order to solve the defects of the prior art, the wedge-shaped spiral curved surface device for transporting the bubbles is provided, the directional transportation of the bubbles can be realized by the wedge-shaped spiral curved surface of the device, the transportation speed of the bubbles can be conveniently regulated through parameter adjustment, and the direction positioning and the speed of the transportation of the bubbles can be effectively improved.

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

a wedge-shaped spiral curved surface device for transporting bubbles comprises a substrate, wherein an Archimedes spiral curved surface is arranged on the substrate, the Archimedes spiral curved surface is provided with a wedge angle, and the smaller the polar angle is, the larger the width is.

In the wedge-shaped spiral curved surface device for transporting the bubbles, the curve theta value of the Archimedes spiral curved surface is between 0 and pi.

The wedge-shaped spiral curved surface device for bubble transportation has a wedge angle of 4-12 degrees.

The invention solves the defect that the wedge-shaped transportation distance and the transportation speed can not meet the requirements simultaneously by combining the wedge-shaped surface with the curved surface; and when the bubble approaches to the curvature edge and approaches to 180 degrees, the conveying speed of the curved surface is slower, particularly the curvature edge with smaller curvature gradient, the moving speed approaches to 0 mm/s and the curved surface is close to a stagnation state. The smaller the curvature gradient, the larger the distance of the curved surface, and the longer the curved surface of the curve.

The invention can realize the high-speed directional transportation of the bubbles so as to adapt to the application of the bubbles in the aspects of industry, medicine, environmental engineering and the like.

By regulating parameters of the wedge-shaped helical curved surface, e.g. by setting different helical distances and wedge anglesαThe bubble driving force and the transport speed can be controlled.

According to the invention, when the diameter of the air bubble is larger than the width of the wedge-shaped curved surface, the air bubble is transported by the curvature driving force generated by the Archimedes spiral line and the Laplace force generated by the wedge-shaped surface together; when the width of the wedge-shaped curved surface is larger than the diameter of the bubble, the bubble can still be transported by the curvature driving force generated by the Archimedes spiral.

Drawings

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

Fig. 2 is a conveying diagram of bubbles on a wedge-shaped surface.

Fig. 3 is a graph comparing the transport speed of bubbles in three configurations.

FIG. 4 is a graph of curvature magnitude versus bubble transport velocity.

FIG. 5 is a graph of wedge angle magnitude versus bubble transport velocity.

FIG. 6 is a diagram of the transport of bubbles in a helical curved surface.

FIG. 7 is a graph of gas bubble transport over a wedge-shaped helical surface of the present invention.

Detailed Description

Referring to the attached drawing, the wedge-shaped spiral curved surface device for transporting bubbles comprises a substrate, wherein an Archimedes spiral curved surface is arranged on the substrate, the Archimedes spiral curved surface is provided with a wedge angle, and three samples with the wedge angles of 4 degrees, 8 degrees and 12 degrees are respectively manufactured when the polar angle is smaller and the width is larger; the curve theta of the Archimedes spiral surface is pi.

The preparation method of the wedge-shaped spiral curved surface comprises the following steps:

1) the method adopts CNC numerical control milling, and comprises the following specific processes:

setting parameters of the curved surface: setting the milling route of the curved surface as Archimedes spiral r =aTheta and trapezoidal, and let parametersaAre respectively taken asa= pi anda=2 pi; the upper bottom of the trapezoid is set to be 2mm, and the included angles of wedge angles of two bevel edges are respectively 4 degrees, 8 degrees and 12 degrees.

2) Milling and post-processing: selecting a rectangular acrylonitrile-butadiene-styrene copolymer plate with a proper size and a proper thickness of 5mm, cutting according to the parameters, and polishing the curved surface after finishing the cutting, wherein the roughness parameter Ra = 0.8.

FIG. 3 is a diagram of bubble transport on a wedge-shaped surface, with a wedge angle α of 8 °, a wedge narrowest side of 2mm, and a wedge channel total length of 21 mm, which is equal to the total arc length of the curved surface; FIG. 6 bubble transport for an Archimedes spiral surface with a surface parameter a of 1/π; FIG. 7 is a graph of bubble transport on a compound curved surface after combining two wedge surfaces and an Archimedes surface. As shown in fig. 3, 6 and 7, the time required for 4ul of bubbles to be placed on the three structural surfaces to travel equal distances is different; the longest wedge is about 2s, and the second is a simple Archimedes spiral surface which is about 0.7 s; the fastest is the wedge-shaped Archimedes spiral curved surface formed by combining the two, the speed is improved by 4 times compared with a wedge shape and is improved by 0.75 time compared with a pure Archimedes curved surface, and the time is about 0.4 s. The composite structure has larger bubble transport advantages compared with a single wedge-shaped channel or a curvature surface.

Referring to fig. 4, it can be seen that for curvature, the transport velocity for large curvature gradients is generally higher than for small curvature gradients.

As shown in fig. 5, for the same volume of bubbles, the larger the wedge angle, the larger the laplace force, but the shorter the distance over which the laplace force acts, and therefore the wedge angle cannot be made too large, resulting in shortening of the operating distance. The spiral parameters a in the figure are all taken as a = 1/pi, and in the range where the wedge angle is equal to or less than 8 °, the transport speed of the bubbles is larger as the wedge angle α increases.