A Method to Control Surface Tension-Driven Convection Based on Active Temperature Gradient Method

A technology of temperature gradient and surface control, applied in the direction of temperature control using electric method, which can solve the problems of unsatisfactory effect, destroying the convective structure of flow field, and difficult to realize micro-scale system.

Active Publication Date: 2017-10-27
INST OF ENGINEERING THERMOPHYSICS - CHINESE ACAD OF SCI
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Problems solved by technology

It should be noted that applying an external magnetic field will make the whole system extremely complicated, and it is difficult to realize in a micro-scale system; and adding a turbulence device will destroy the convective structure of the flow field
[0007] It can be seen that the method of surface tension-driven convection control is to add related equipment outside the fluid system to control it. Judging from the current suppression effect, the effect is not ideal

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  • A Method to Control Surface Tension-Driven Convection Based on Active Temperature Gradient Method
  • A Method to Control Surface Tension-Driven Convection Based on Active Temperature Gradient Method
  • A Method to Control Surface Tension-Driven Convection Based on Active Temperature Gradient Method

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[0025] The invention provides a control method based on the active temperature gradient method to control the convection driven by the free surface tension of the liquid, so that the fluid in the fluid system is not only affected by the temperature difference of the system itself, but also introduces local heating heat flow to the free surface of the fluid for active heating. To weaken the fluid free surface temperature gradient. The weakening of this temperature gradient can reduce the size of the free surface tension gradient of the liquid, thereby effectively weakening the intensity of heat convection.

[0026] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0027] It should be noted that the left, right, up, down, etc. described below are all based on the directions shown in the drawings.

[0028] See Figure 1A , a typical liquid pool 1 (this embodiment takes a rectangular liquid pool as an example) is heat...

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Abstract

A method of controlling surface tension-driven convection based on temperature gradient is to introduce a local heating source on the free surface of the fluid in the liquid pool for active heating to weaken the temperature gradient of the free surface of the fluid, and reduce the surface tension through the weakening of the temperature gradient The size of the gradient, thus effectively weakening the intensity of thermal convection. The invention actively controls the temperature gradient of the free surface of the fluid, and the maximum vorticity intensity of thermal convection is reduced by 30% under the same temperature condition, and the convection is transformed into a steady-state convection; no external magnetic field is needed to control the convection, and it is driven by surface tension Convection control provides a new approach.

Description

technical field [0001] The invention relates to a control method for controlling convection driven by surface tension of a liquid pool based on a temperature gradient, specifically a method of actively heating the free surface of the fluid in the liquid pool to weaken the temperature gradient of the free surface of the fluid, thereby reducing the intensity of thermal convection the goal of. Background technique [0002] Surface tension-driven convection is the fluid flow caused by the uneven temperature distribution of the free surface of the fluid. It widely exists in microgravity environments, micro-scale systems and crystal growth processes. Its existing environment and flow characteristics can be summarized as follows: [0003] In the space microgravity environment, due to the disappearance of the gravitational field, the thermal convection driven by surface tension becomes the dominant convection mode. have an important impact. [0004] In micro-scale systems, due to...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05D23/19
Inventor 周小明淮秀兰李勋锋成克用
Owner INST OF ENGINEERING THERMOPHYSICS - CHINESE ACAD OF SCI
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