Double-layer micro-channel heat dissipation device based on gas-liquid separation

Abstract

The invention discloses a double-layer micro-channel heat dissipation device based on gas-liquid separation. The double-layer micro-channel heat dissipation device mainly comprises a liquid path micro-channel radiator on the lower layer, a nano-porous film and a gas path micro-channel radiator on the upper layer. The liquid path micro-channel radiator and the gas path micro-channel radiator are connected into a whole through the sintering technology, then the nano-porous film is packaged between the gas and liquid micro-channels, working fluid in the liquid path micro-channel is heated and evaporated, steam enters the gas path micro-channel through the nano-porous film, film evaporation is formed to take away an extremely large amount of heat, and meanwhile, gas-liquid separation is achieved, the two-phase flow instability is reduced, due to the existence of the porous structure in the liquid path micro-channel, the liquid film drying phenomenon is effectively relieved, the critical phenomenon is delayed, and the critical heat flux density is greatly improved. The device has the advantages of being small in occupied area, low in power consumption and high in heat dissipation capacity, and can be used for meeting the heat dissipation requirement exceeding the heat flux density.

Description

technical field [0001] The invention relates to the field of cooling and heat dissipation in tiny spaces, is applicable to ultra-high heat flux heat dissipation technology, and particularly relates to a double-layer micro-channel heat dissipation device based on gas-liquid separation. Background technique [0002] With the rapid development of MEMS / NEMS technology and 3D-IC packaging technology, the miniaturization and integration of electronic devices are higher. At the same time, they are also facing the dual challenges of high heat flux density and local ultra-high heat flux density. In recent years, people have proposed a variety of new cooling technologies to improve the reliability of materials and equipment, including: micro-channel cooling, spray cooling, piezoelectric cooling, jet cooling, heat pipes and other methods. Among them, microchannel cooling technology has become a research hotspot due to its strong heat transfer capacity, compactness, and heat transfer un...

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Problems solved by technology

[0004] However, due to the complexity of the two-phase flow in microchannels, there are still many unsolved problems in flow boiling in microchannels, such as large flow boiling instability, excessively high pressure drop, and difficulty in further increasing the critical heat flux, etc.

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