Method for controlling surface tension driven convection based on driving temperature gradient method

Abstract

The invention provides a method for controlling surface tension driven convection based on a driving temperature gradient method. A partial heating source is introduced into a fluid free surface in a liquid tank to carry out driving heating so as to weaken a temperature gradient of the fluid free surface; the size of the surface tension gradient is reduced by weakening the temperature gradient, so that the heat convection strength is effectively weakened. According to the method, the temperature gradient of the fluid free surface is actively controlled and the maximal vorticity strength of the heat convection under the same temperature condition is reduced by 30%, and convection is converted into stable convection; an external magnetic field does not need to be increased to control the convection and a new method is provided for controlling the surface tension driven convection.

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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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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