Evaporation-boiling longitudinal coexistence composite structure for enhancing boiling heat transfer

Abstract

The invention discloses an evaporation-boiling longitudinal coexistence composite structure for strengthening boiling heat transfer, and relates to the technical field of strengthening boiling heat transfer. The evaporation-boiling longitudinal coexistence composite structure for strengthening boiling heat transfer comprises a heating substrate and a plurality of heat conduction micro-columns arranged on the substrate, the upper ends of the heat conduction micro-columns are combined with a porous capillary core to form a composite structure, and small bubbles discharged by evaporation of the porous capillary core are utilized to increase a gasification core of a boiling area at the bottom of the porous capillary core. The boiling starting point is lowered, flow field disturbance is enhanced, boiling heat transfer of a bottom liquid area is enhanced, and in addition, the heat transfer area is increased in the longitudinal direction. Protrusions are arranged on the lower surface of the porous capillary core, so that small bubbles are easier to separate and enter a superheated fluid working medium area at the bottom, stable separation of the bubbles is accelerated, occurrence of an air film formed by direct boiling in an area between a heating surface and the lower surface of the porous capillary core is delayed, and porous evaporation-boiling synergistic reinforcement phase change heat transfer is achieved.

Description

technical field [0001] The invention relates to the technical field of enhancing boiling heat transfer, in particular to an evaporation-boiling vertical coexistence composite structure for enhancing boiling heat transfer. Background technique [0002] Due to the development characteristics of miniaturization and high integration of microelectronic devices, they also put forward higher requirements for efficient heat dissipation methods. At present, boiling heat transfer, as an efficient energy transfer method accompanied by gas-liquid phase transition, has the characteristics of small heat transfer temperature difference and large heat flux density, and has become an important technical means to solve this problem. [0003] At present, a large number of studies have shown that porous media have high specific surface area and strong capillary suction capacity. When directly applied to boiling heat transfer, the pore structure inside the porous can not only expand the heat tra...

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Problems solved by technology

However, there is still room for improvement in this application. Its porous structure and channels jointly occupy the heating surface, which sacrifices a part of the phase change heat transfer area while enhancing heat transfer.

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