Mixed wettability micro-nano composite enhanced heat exchange structure and preparation method thereof

Abstract

The invention discloses a mixed wettability micro-nano composite enhanced heat exchange structure. The structure comprises a heat dissipation substrate, wherein a plurality of square micro-cylindricalarray units and groove channels arranged among the micro-cylindrical array units are etched on the heat dissipation substrate. Each micro-cylinder array unit comprises a plurality of micro-cylinderswhich are arranged in order, nanowires are arranged on the groove channels and the micro-cylinders, the diameter of the nanowires ranges from 200 nm to 500 nm, and the height of the nanowires ranges from 10 micrometers. The invention further discloses a manufacturing method of the mixed wettability micro-nano composite enhanced heat exchange structure. The micro-cylindrical array unit and the nanowire structure adopted by the invention can effectively enhance the boiling heat transfer coefficient of high heat flux and delay the boiling dry burning phenomenon.

Description

technical field [0001] The invention belongs to the technical field of thermal control of electronic devices, and in particular relates to a mixed wettability micro-nano composite enhanced heat exchange structure and a preparation method of the structure. Background technique [0002] With the rapid development of micro-electro-mechanical technology, the miniaturization and integration of electronic devices has become an inevitable trend, the heat generation per unit volume is increasing, and the heat dissipation of high-power devices in small spaces has become an urgent problem to be solved. [0003] Boiling heat transfer, as a phase-change heat transfer method, has an order of magnitude difference in heat transfer coefficient compared with traditional air cooling and liquid single convection, and is a very effective heat dissipation method. However, when the heat flux is high, the boiling heat transfer performance is often severely deteriorated. The fundamental reason is t...

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Problems solved by technology

However, most of the existing studies on enhancing heat transfer by adjusting surface wettability are based on two-dimensional smooth surfaces, and only focus on the influence of hydrophilic and hydrophobic wettability on heat transfer, while ignoring the influence of surface micro-nano structure; similarly, In the research on heat transfer enhancement of micro-nano composite structure, the main focus is on the influence of surface micro-nano structure on heat transfer, and the important factor of hydrophilic and hydrophobic wettability is not considered, which makes it very difficult to improve the pool boiling heat transfer performance of high heat flux. limited

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