A local adaptive controllable wettability coupling microstructure enhanced boiling heat transfer method

Abstract

The invention discloses a locally adaptive controllable wettability coupling microstructure enhanced boiling heat transfer method, and belongs to the technical field of enhanced heat transfer. The locally adaptive controllable wettability coupling microstructure enhanced boiling heat transfer method comprises the specific steps that an electrode film is arranged on a microstructure of a heat transfer base, the electrode film is connected to a metal electrode to form an electric field, charged metal nanoparticles in a heat transfer medium are adsorbed on the heat transfer surface intermittentlyunder the action of the electric field, and the controllable conversion of heat transfer surface wettability is realized. According to the locally adaptive controllable wettability coupling microstructure enhanced boiling heat transfer method, the active controllable conversion of surface wettability is introduced into the boiling process, the nucleation and separation of bubbles are actively controlled, controllable enhanced boiling and adaptive phase heat transfer are possible, and far-reaching academic value and application value are achieved.

Description

technical field [0001] The invention belongs to the technical field of enhanced heat transfer, in particular to a method for enhancing boiling heat transfer with local self-adaptive controllable wettability coupling microstructure. Background technique [0002] As a high-efficiency heat transfer method, boiling phase change heat transfer is widely used in high-efficiency heat exchangers, rockets and other fields that require enhanced heat transfer and rapid cooling. Based on the basic physical understanding of the boiling process, the boiling stage can be divided into natural convection heat transfer, nucleate boiling, transition boiling and film boiling. When the wall superheat is small, the heating surface and the heat exchange fluid mainly exchange heat in the form of natural convection heat transfer. At this time, the heat flux density is low and no boiling bubbles are generated, which is called the natural convection stage; when the wall superheat increases to a certain...

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Problems solved by technology

For the microstructure boiling surface of tens of microns or more, limited by processing methods and wettability treatment methods, the bottom of the microstructure is generally a hydrophilic matrix, and the top is treated with hydrophobic treatment; the advantage is that the number of vaporized cores increases, and the bubbles easily rise to the top of the microstructure and grow up; but the disadvantage is also obvious, that is, the bubbles are not easy to get out

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