Portable solid microbead Reynolds experiment demonstration device

Abstract

The utility model relates to a portable solid microbead Reynolds experiment demonstration device which comprises a water storage tank, the side portion of the water storage tank is provided with a water outlet and a water return port, a transparent experiment pipeline is arranged outside the water storage tank, and the two ends of the experiment pipeline are connected with the water outlet and the water return port respectively. A feeding bent pipe for injecting black hollow glass beads into the experimental pipeline is arranged in the water storage tank, and the lower end of the feeding bent pipe extends into the water inlet end of the experimental pipeline through the water outlet. The portable solid microbead Reynolds experiment demonstration device is novel in structure and reasonable in design, black hollow glass microbeads with the density similar to that of water are used as tracer particles to display the flowing state of a water body in an experiment pipeline, and the laminar flow, turbulent flow and transition states of liquid are clearly demonstrated; water self-circulation can be achieved, the experiment pipeline is convenient to disassemble and assemble, the defects that a traditional Reynolds experiment device is large in size and not portable are overcome, and high practicability is achieved.

Description

Technical Field

[0001] The utility model relates to the field of experimental teaching equipment, in particular to a portable solid micro-bead Reynolds experimental demonstration device. Background Art

[0002] The Renault experimental device is an important experimental teaching device in fluid mechanics. Some existing devices are complex, large in size, weight, and water consumption, and are not easy to disassemble and transport; the tracer is a colored liquid such as red ink, which is easy to pollute the water quality; the water needs to be replaced repeatedly and cannot achieve self-circulation.

[0003] The water flowing out of the constant pressure water tank of the existing Reynolds test device cannot be directly recycled due to the contamination of ink. The invention patent of Chinese patent CN1248178C discloses a self-circulating Reynolds tester with automatic decolorizing display liquid, including a constant pressure water tank, a self-circulating water return device and a container for automatically decolorizing display liquid, wherein the automatic decolorizing display liquid is composed of phenolphthalein and sodium hydroxide with a special mass ratio and concentration. Although the device realizes the recycling of water on the Reynolds tester, the decolorizing process will be affected by the pH value and requires additional acidic reagents, which will increase the instability and cost of the experiment.

[0004] The utility model patent of Chinese patent CN219716276U discloses a liquid circulatory Renault device, including an ink bottle, a constant pressure water tank, an experimental pipeline, and an ink injection tube container. The liquid used is hydrolyzable red ink. Although the purpose of self-circulation is achieved, a container for dissolving the red ink needs to be added, which increases the cost of the device. Utility Model Content

[0005] In view of this, the purpose of the utility model is to provide a portable solid microbead Reynolds experiment demonstration device with novel structure, reasonable design and strong practicality, which adds solid tracer particles to display the flow state of water in the experimental pipeline.

[0006] The utility model is implemented by the following scheme: a portable solid microbead Reynolds experiment demonstration device, comprising a water storage tank, a water outlet and a water return port are arranged on the side of the water storage tank, a transparent experimental pipeline is arranged outside the water storage tank, and the two ends of the experimental pipeline are respectively connected to the water outlet and the water return port; a feed elbow is arranged in the water storage tank for injecting black hollow glass microbeads into the experimental pipeline, and the lower end of the feed elbow extends into the water inlet end of the experimental pipeline through the water outlet.

[0007] Furthermore, the water tank is provided with a guide water stabilizing grid and an overflow plate, which divide the water tank into a reflux trough, a liquid transition trough and a constant liquid trough. The water outlet is located on the side of the constant liquid trough, and the return water outlet is located on the side of the reflux trough.

[0008] Furthermore, the height of the guide water stabilizing grid is lower than the height of the overflow plate, and a water hole is provided at the lower part of the overflow plate; a filter screen and a bottom suction pump are provided in the reflux trough, and the water outlet of the bottom suction pump is connected to a water outlet hose leading to the liquid transition trough.

[0009] Furthermore, the upper end of the feed elbow is connected to the outlet end of a fan through the discharge end, and the inlet end of the fan is connected to a storage box storing hollow glass microspheres through the feed pipe.

[0010] Furthermore, a flow meter and a regulating valve are connected in series on the experimental pipeline.

[0011] Compared with the prior art, the utility model has the following beneficial effects: the portable solid microbead Reynolds experiment demonstration device of the utility model has a novel structure and a reasonable design. It uses black hollow glass microbeads with a density similar to that of water as tracer particles to display the flow state of water in the experimental pipeline, and clearly demonstrates liquid laminar flow, turbulence and transitional states; it can realize self-circulation of water, and the experimental pipeline is easy to disassemble and assemble, which solves the shortcomings of traditional Reynolds experiment devices that are bulky and not portable, and has strong practicality.

[0012] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below through specific embodiments and related drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the utility model;

[0014] Figure 2 This is a schematic diagram of the internal structure of the water storage tank in the embodiment of the utility model;

[0015] Explanation of the numbers in the figure: 1-water storage tank, 2-diversion and stabilizing water grid, 3-overflow plate, 4-feed elbow, 5-external thread connector, 6-internal thread straight connector, 7-experimental pipeline, 8-flow meter, 9-stop valve, 10-quick-insert elbow, 11-reflux tank, 12-liquid transition tank, 13-constant liquid tank, 14-bottom suction pump. DETAILED DESCRIPTION

[0016] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0017] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0018] like Figure 1~2 As shown, a portable solid microbead Reynolds experiment demonstration device comprises a water tank 1, wherein a water outlet and a water return port are arranged on the side of the water tank 1, a transparent experimental pipe 7 is arranged outside the water tank 1, and the two ends of the experimental pipe 7 are respectively connected to the water outlet and the water return port; a feed elbow 4 is arranged in the water tank for injecting black hollow glass microbeads into the experimental pipe 7, and the lower end of the feed elbow 4 extends into the water inlet end of the experimental pipe 7 through the water outlet; the density of hollow glass microbeads is similar to that of water, and black hollow glass microbeads with a density similar to that of water are used as tracer particles to display the flow state of water in the experimental pipe, clearly demonstrate the laminar flow, turbulent flow and transition state of the liquid, measure the flow rate, and calculate the Reynolds number; the experimental pipe is used as a circulation pipe to realize self-circulation of water, and the whole is portable.

[0019] Hollow glass microspheres are used as tracer particles, which move with the fluid. Through these particles, the movement of the fluid is observed and the flow phenomenon is displayed. The requirements for its followability and visibility are relatively strict. High-quality tracer particles require: the specific gravity should be as consistent as possible with the experimental fluid; the scale should be small enough; the shape should be as round as possible, and the size distribution should be as uniform as possible; the tracer particles are not easy to precipitate and pollute the flow field; the color should be darker. Practical experiments have shown that hollow glass microspheres have a good tracing effect as tracer particles for liquid flow.

[0020] In this embodiment, the water tank 1 is provided with a guide and stabilizing water gate 2 and an overflow plate 3, and the guide and stabilizing water gate 1 and the overflow plate 3 divide the water tank into a return groove 11, a liquid transition groove 12 and a constant liquid groove 13, the water outlet is located on the side of the constant liquid groove, the water return port is located on the side of the return groove, and the water outlet position is higher than the water return port position.

[0021] In this embodiment, the height of the diversion water stabilizing grid is lower than the height of the overflow plate, which is conducive to maintaining the stability of the liquid level in the constant liquid tank and controlling the experimental static pressure head; a water hole is provided at the bottom of the overflow plate; a filter screen (not shown in the figure) and a bottom suction pump 14 are provided in the reflux tank, and the outlet of the bottom suction pump 14 is connected to a water outlet hose leading to the liquid transition tank. The filter screen is covered on the inner side of the return water outlet, and the hollow glass microbeads are intercepted by the filter screen for recycling after returning to the water storage tank, so that the water resources in the experiment are not polluted and can be recycled, which can save experimental water and does not corrode the experimental instruments; at the same time, the water in the reflux tank is pumped to the liquid transition tank by the bottom suction pump, and the liquid transition tank 12 and the constant liquid tank 13 are connected through the water hole on the overflow plate 3. The liquid level difference between the constant liquid tank 13 and the reflux tank is used to make the water flow back to the reflux tank through the experimental pipe 7. When the liquid level in the liquid transition tank is too high, the water can flow back to the reflux tank through the top of the diversion water stabilizing grid 2.

[0022] In this embodiment, the upper end of the feed elbow is connected to the outlet end of a blower (not shown in the figure) through the discharge end, and the inlet end of the blower is connected to a storage box (not shown in the figure) storing hollow glass microspheres through the feed pipe. During the experiment, the blower is used to blow the hollow glass microspheres into the experimental pipeline through the feed elbow. By controlling the blower frequency, the injection amount per second is kept the same to ensure the stability of the experiment. The use of a blower can realize the automatic feeding function, but in the specific implementation process, the hollow glass microspheres in the feed elbow can also be blown into the experimental pipeline by artificial blowing.

[0023] In this embodiment, the experimental pipeline is connected in series with a flow meter 8 and a regulating valve 9, the flow meter 8 is a direct-insertion flow meter, and the regulating valve 9 is a quick-insertion regulating valve. The hollow glass microspheres exhibit different flow patterns by adjusting the opening of the regulating valve 9, and the cumulative flow and instantaneous flow are measured by the flow meter 8 to record the experimental data.

[0024] In this embodiment, the experimental pipeline 7 adopts a transparent PVC tube, which is assembled with a lightweight PVC tube and a quick-plug connector and is easy to disassemble; the water outlet is connected to the water inlet end of the experimental pipeline 7 through an external thread connector 5 and an internal thread straight-through connector 6; the experimental pipeline 7 uses a quick-plug elbow to achieve connection at the bending part, and the entire experimental pipeline 7 uses a quick-plug method to achieve quick disassembly and assembly.

[0025] The experimental pipeline of this device is assembled with lightweight transparent PVC pipes and quick-plug connectors. All components can be manually disassembled and installed, which solves the shortcomings of the traditional Reynolds device, which is bulky and not portable, and has strong practicality. The water tank is equipped with a guide water stabilizing grid and an overflow plate, which divides the water tank into a reflux trough, a liquid transition trough and a constant liquid trough. Organic glass, plastic, wood, metal, rock and other materials can be placed in the reflux trough to reduce the disturbance caused by the reflux fluid to the liquid in the water tank. The height of the guide water stabilizing grid is lower than the overflow plate, which is conducive to maintaining the stability of the liquid level in the constant liquid tank and controlling the experimental static pressure head. The liquid transition trough further stabilizes the liquid level. The design of the self-circulating pipeline allows the fluid to flow out of the water tank outlet and back to the water tank inlet through the circulating pipeline, solving the problem of changing water. Black hollow glass microbeads with a density close to that of water are used as tracer particles to display the flow state of water in the experimental pipeline. The water resources in the experiment are not polluted and can be recycled, which can save experimental water and does not corrode experimental instruments. The hollow glass microbeads are blown into the center of the pipeline through the feed elbow by a fan. The fan frequency is controlled to keep the same injection volume per second to ensure experimental stability. With the advantages of easy availability of materials, simple disassembly and assembly, easy to carry, self-circulation, and solid tracer, the experiment can be brought into the classroom.

[0026] Unless otherwise stated, any technical solution disclosed in the above utility model, if it discloses a numerical range, then the disclosed numerical range is a preferred numerical range. Any technician in the field should understand that the preferred numerical range is only a numerical value with a more obvious technical effect or representative value among many feasible numerical values. Since there are too many numerical values ​​to be exhaustive, the utility model discloses only some numerical values ​​to illustrate the technical solution of the utility model, and the numerical values ​​listed above should not constitute a limitation on the scope of protection of the utility model.

[0027] If the present invention discloses or involves components or structures that are fixedly connected to each other, then, unless otherwise stated, the fixed connection can be understood as: a detachable fixed connection (for example, connection using bolts or screws), and can also be understood as: a non-detachable fixed connection (for example, riveting, welding). Of course, the mutual fixed connection can also be replaced by an integrated structure (for example, manufactured by one-piece molding using a casting process) (except when it is obviously impossible to use an one-piece molding process).

[0028] In addition, unless otherwise stated, the terms used to indicate positional relationships or shapes in any of the technical solutions disclosed in the above utility model include states or shapes that are approximate, similar or close thereto.

[0029] Any component provided by the utility model can be assembled from multiple separate components, or can be a separate component manufactured by an integrated molding process.

[0030] The above is only the preferred embodiment of the utility model, and does not limit the utility model in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the utility model without departing from the technical solution of the utility model still belongs to the protection scope of the technical solution of the utility model.

Claims

1. A portable solid microbead Reynolds experiment demonstration device, characterized in that: It comprises a water storage tank, a water outlet and a water return port are arranged on the side of the water storage tank, a transparent experimental pipe is arranged outside the water storage tank, and the two ends of the experimental pipe are respectively connected to the water outlet and the water return port; a feed elbow pipe for injecting black hollow glass microbeads into the experimental pipe is arranged inside the water storage tank, and the lower end of the feed elbow pipe extends into the water inlet end of the experimental pipe through the water outlet.

2. The portable solid microbead Reynolds experiment demonstration device according to claim 1 is characterized in that: The water storage tank is provided with a guide water stabilizing grid and an overflow plate, which divide the water tank into a reflux groove, a liquid transition groove and a constant liquid groove. The water outlet is located at the side of the constant liquid groove, and the water return port is located at the side of the reflux groove.

3. The portable solid microbead Reynolds experiment demonstration device according to claim 2 is characterized in that: The height of the guide water stabilizing grid is lower than that of the overflow plate, and a water hole is provided at the lower part of the overflow plate; a filter screen and a bottom suction pump are arranged in the reflux trough, and the water outlet of the bottom suction pump is connected to a water outlet hose leading to the liquid transition trough.

4. The portable solid microbead Reynolds experiment demonstration device according to claim 1 is characterized in that: The upper end of the feed elbow is connected to the outlet end of a fan through the discharge end, and the inlet end of the fan is connected to a storage box storing hollow glass microbeads through the feed pipe.

5. The portable solid microbead Reynolds experiment demonstration device according to claim 1 is characterized in that: The experimental pipeline is connected in series with a flow meter and a regulating valve.

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