Mixed wettability micro-nano composite enhanced heat transfer structure and preparation method of the structure

Abstract

The invention discloses a mixed wettability micro-nano composite enhanced heat exchange structure, which includes a heat dissipation substrate, and the heat dissipation substrate is etched with a plurality of square micro-cylindrical array units and grooves arranged between the micro-cylindrical array units The channel and the micro cylinder array unit include a plurality of neatly arranged micro cylinders, the grooved channels and the micro cylinders are provided with nanowires, the diameter of the nanowires is 200nm-500nm, and the height of the nanowires is 10 μm. The invention also 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 in the invention can effectively enhance the boiling heat transfer coefficient of high heat flux and delay the phenomenon of boiling and dry burning.

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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