A method of controlling liquid to generate Bernard convection

A liquid, one-pair technology, applied in the field of controlling liquids to produce Benard convection, can solve problems such as unsatisfactory experimental results, and achieve the effect of reducing experimental difficulty and overcoming poor reproducibility

Inactive Publication Date: 2016-02-24
LIAONING UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this, how to effectively control the phenomenon of Bernard convection has become an urgent problem to be solved, and many experimental schemes for producing Bernard convection have been proposed, but the experimental results are not very satisfactory

Method used

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  • A method of controlling liquid to generate Bernard convection
  • A method of controlling liquid to generate Bernard convection
  • A method of controlling liquid to generate Bernard convection

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Such as figure 1 and 3 As shown, a method for controlling liquid to generate Bernard convection, comprising:

[0030] Step 1, after filtering out the solid residue in the liquid, slowly inject the liquid into the reaction vessel 1 until the liquid is full of the reaction vessel 1, ensure that there are no air bubbles in the liquid, and seal the reaction vessel 1, wherein , the reaction vessel 1 has a pair of heat-conducting surfaces 5 and 6, and the remaining surfaces are not heat-conducting. The inside of the reaction vessel 1 is provided with a positive electrode 4 and a negative electrode 3, and the positive electrode 4 and the negative electrode 3 are Electrically connected with the pulsed electric field generator 2;

[0031] Step 2, keep the output frequency value of the pulsed electric field generator 2 constant, calculate the temperature difference of a pair of heat-conducting surfaces 5 and 6 of the reaction vessel 1 according to formula (1), adjust one of the...

Embodiment 2

[0046] Such as figure 2 with 3 As shown, a method for controlling liquid to generate Bernard convection, comprising:

[0047] Step 1, after filtering out the solid residue in the liquid, slowly inject the liquid into the reaction vessel 1 until the liquid is full of the reaction vessel 1, ensure that there are no air bubbles in the liquid, and seal the reaction vessel 1, wherein , the reaction vessel 1 has a pair of heat-conducting surfaces 5 and 6, and the remaining surfaces are not heat-conducting. The inside of the reaction vessel 1 is provided with a positive electrode 4 and a negative electrode 3, and the positive electrode 4 and the negative electrode 3 are Electrically connected with the pulsed electric field generator 2;

[0048] Step 2, keep the temperature of the pair of heat conduction surfaces 5 and 6 of the reaction vessel 1 constant, and the temperature of the pair of heat conduction surfaces 5 and 6 of the reaction vessel is not equal, measure the temperature...

Embodiment 3

[0052] 1. According to the method described in Example 1, the Bernard experiment was carried out on the silicone oil and the lubricating oil, and the experimental results are shown in Tables 1-2.

[0053] Table 1 uses silicone oil to do the parameters of Bernard's experiment (constant frequency)

[0054]

[0055] Table 2 uses lubricating oil to do the parameter of Bernard experiment (frequency is constant)

[0056]

[0057] 2. According to the method described in Example 2, the Bernard experiment was carried out on the silicone oil and the lubricating oil, and the experimental results are shown in Tables 3-4.

[0058] Table 3 uses silicone oil to do the parameters of Bernard's experiment (the temperature difference is constant)

[0059]

[0060] Table 4 uses lubricating oil to do the parameters of Bernard's experiment (the temperature difference is constant)

[0061]

[0062]

[0063] 3. Controlled experiment

[0064] A routine control Bernard experiment was ...

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Abstract

The invention discloses a method for controlling a liquid to generate Benard convection. The method comprises the following steps of filling the liquid in a reaction container, and sealing the reaction container, wherein the reaction container is provided with a pair of heat conducting surfaces, the rest of surfaces do not have a heat conducting function, the reaction container is internally provided with positive and negative electrode electric rods, and the positive and negative electrode electric rods are electrically connected with a pulsed electric field generator; keeping the constant frequency value of the pulsed electric field generator, and regulating the temperature difference values between the pair of heat conducting surfaces of the reaction container to calculate the temperature difference value so as to obtain a Benard convection phenomenon of the liquid; or keeping the constant temperature of the pair of heat conducting surfaces of the reaction container, and regulating a frequency value of the pulsed electric field generator so as to obtain the Benard convection phenomenon of the liquid. The method disclosed by the invention has the advantages that the size of an experimental device is effectively reduced, the accuracy control is achieved, the defect of poor reproducibility of the previous experiment is overcome, and the research precision of the Benard convection in weather prognosis, frozen earth research, bioengineering technical field and other fields is improved.

Description

technical field [0001] The invention relates to a method for controlling fluid, in particular to a method for controlling liquid to generate Bernard convection. Background technique [0002] The purpose of Benard convection is to maintain a constant temperature on the upper plate, and evenly heat the thin layer of liquid in the horizontal container on the lower plate. If the temperature difference between the upper and lower sides exceeds a certain critical value, a hexagonal grid similar to a honeycomb will appear in the liquid, and the heat transfer of the liquid The way is transitioned from heat conduction to convection, the liquid in the center of each hexagon flows upward, and the liquid at the boundary flows downward. This is the result of competition between convection and inhibitory factors (viscosity and thermal diffusion). It is a special fluid phenomenon in liquid structure. [0003] This convective phenomenon is not only common in daily life, but also ubiquitou...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F15C1/00F15C1/06
Inventor 齐锦刚高勇王冰赵作福王建中王家毅李扬
Owner LIAONING UNIVERSITY OF TECHNOLOGY
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