Ground simulative experiment device and method for micro-gravity flow boiling critical heat flux density

Abstract

The invention discloses a ground simulative experiment device and method for micro-gravity flow boiling critical heat flux density, and the device comprises a test tube, a flow regulating valve, a flow meter, a pump, a condenser, a pre-heater, a buffer tank, a speed regulator, a voltage stabilizer, a temperature controller, a heating surface, a power supply and a temperature collector. The simulative experiment method is that the critical heat flux density of the flow boiling heat transfer under microgravity conditions can be replaced by the critical heat flux density range measured under normal gravity conditions and corresponding to the experimental conditions that theta is equal to 315 degrees and theta is equal to 135 degrees. The ground simulative experiment device and method for micro-gravity flow boiling critical heat flux density provided by the invention, compared with the direct micro-gravity experiment and traditional ground simulation method, are rather simple in device structure, very convenient to operate and good in economy, can satisfy experimental test of different experiment conditions, can accurately, conveniently and economically simulate the critical heat fluxdensity under microgravity conditions on the ground, and significantly expand the application range compared with the conventional simulation method.

Description

technical field [0001] The invention belongs to the technical field of heat dissipation of microelectronic devices and heat management under microgravity conditions, and in particular relates to a ground simulation experiment device and method for critical heat flux density of flow boiling in microgravity. Background technique [0002] Critical heat flux is a key parameter of flow boiling heat transfer performance. Due to the lack of buoyancy under microgravity conditions, the high heat flux region of flow boiling will deteriorate to a certain extent, and the critical heat flux will also decrease accordingly. Therefore, it is of great significance to obtain the variation law of the flow boiling critical heat flux under microgravity conditions for guiding the design and operation of electronic device heat dissipation and thermal management systems under microgravity conditions. However, due to the complexity of the experimental equipment and conditions of the critical heat f...

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Problems solved by technology

However, the critical experimental conditions required by this equivalence criterion are too harsh, especially the critical flow velocity is very high, which causes the obtained flow boiling simulation experimental data to deviate from the application range (usually the flow velocity cannot be higher than 2m / s), resulting in its The simulation experiment method is not practical

In addition, although some scholars have proposed the inertial force dominant in different flow boiling, that is, the critical flow rate criterion that the critical heat flux density is approximately equal under normal and microgravity conditions, but this method can only be used for ground simulations above the critical flow rate. The microgravity flow boiling (such as the critical flow velocity proposed by Zhang et al. of Purdue University is greater than 1.5m / s), and the flow boiling below the critical flow velocity cannot be simulated, so the scope of application is also very limited

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