Pump driven two-phase fluid loop evaporator

Abstract

The present invention provides a pump-driven two-phase fluid circuit evaporator, comprising: an evaporator shell 1, a hydrophobic capillary core 2, an axial liquid channel 3 and an axial steam main channel 4; the hydrophobic capillary core 2 is installed Inside the evaporator shell 1; a plurality of axial liquid channels 3 are arranged between the evaporator shell 1 and the hydrophobic capillary core 2; internal. For the two-phase fluid circuit driven by the capillary pump, the present invention uses hydrophobic porous materials to cover the surface of the open micro channels of the evaporator, so that the liquid cannot occupy the space of the main steam channel due to condensation under various orientations or the influence of gravity. The steam bubbles that may exist in the liquid channel can be smoothly overflowed from the channel, which is beneficial to the smooth start of the evaporator and the reduction of the superheat at the start, and improves the heat transfer coefficient of the evaporation process.

Description

Pump Driven Two-Phase Fluid Loop Evaporator technical field [0001] The present invention relates to the technical field of heat transfer elements, in particular, to a pump-driven two-phase fluid circuit evaporator. Background technique At present, many two-phase fluid circuit designs adopt evaporative heat sinks, such as loop heat pipes, capillary suction loops, mechanical Mechanical pump-assisted loop heat pipe or capillary suction loop, or purely mechanical pump-driven, gas-liquid separation two-phase fluid loop, etc. Tradition As disclosed in the patent document CN107529365B, a gravity-assisted multi-evaporator two-phase fluid circuit device includes a Thin evaporator, vapor pipeline, condenser pipeline, liquid pipeline, liquid accumulator, it also includes vapor concentrator, inverted U-shaped pipe fittings, 3 to 12 capillary evaporators are used for loop valves, liquid input pipelines, liquid flow dividers, and are evenly arranged on the heat source to condense...

AI Technical Summary

Problems solved by technology

[0003] However, the existing capillary pumps generally adopt hydrophilic capillary core material and reverse capillary core structure. On the one hand, the direction of liquid flow in the reverse capillary core is opposite to the direction of heat flow, and the gas-liquid interface continues to flow when the heat flow is large. Backward, the distance from the shell continues to expand, resulting in greater thermal resistance; on the other hand, the capillary core and the shell are often made separately and compressed by interference fit, and the contact thermal resistance between the two is relatively large; In addition, the reverse capillary structure makes the cross-sectional area of ​​the steam channel in the evaporator very small, and it is easy to accumulate liquid after filling, transportation, different orientations or certain working conditions. When the evaporation channel is filled with liquid, the heat sink must be To achieve a large degree of superheat, the formation of nucleate boiling in the steam channel, let the steam drive out most of the liquid to achieve stable evaporation heat transfer

These three factors make the start-up performance of the evaporative heat sink and the evaporation coefficient during stable operation still have a large room for improvement.

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