Method and device for acoustic cavitation and titanium dioxide nano particle controlling boiling and heat conduction

Abstract

The invention provides a method of controlling the boiling heat transfer by the acoustic cavitation and titanium dioxide nano-particles, and relates to the heat exchange technology. The method includes the steps of adding the titanium dioxide nano-particles to a liquid in a testing case, and generating an acoustic cavitation field to the liquid so as to control the boiling heat transfer to intensify or weaken. The method of the invention has two elements, i.e., an adjustable-frequency ultrasonic transducer capable of generating cavitation bubble bunches and particles with the size in the nanometer level. A device for realizing the method of the invention comprises the testing case, a heat transfer test surface, electric heaters, the ultrasonic transducer, a supersonic generator, an observation window, a condenser, a thermocouple, a pressure gauge and the nano-particles. The method can carry out intensifying and weakening control for single-phase convection heat transfer of the heat transfer surface and the nucleate boiling heat transfer, with high heat transfer intensification rate and high cooling heat flow density; and the method of the invention is an active complex heat transfer intensification method.

Description

technical field [0001] The present invention relates to an acoustic cavitation and TiO 2 The invention relates to a method for enhancing heat transfer by controlling boiling with nano particles, especially a method and device for enhancing heat transfer on various heat transfer surfaces. Background technique [0002] Boiling heat transfer has been widely used in energy fields, power, aviation and aerospace engineering due to its high heat transfer capacity. However, the continuous increase in the heat load of advanced equipment has prompted heat transfer scholars to continue to seek efficient and reliable cooling methods. To effectively control the boiling heat transfer process, it is necessary to have a comprehensive and in-depth understanding of it. Although heat transfer researchers have obtained a large amount of data about heat flux density and wall superheat through experiments, as well as the nucleation, growth and detachment of bubbles that are closely related to bo...

AI Technical Summary

Problems solved by technology

[0008] Solve the problems of boiling heat transfer enhancement and boiling thermal hysteresis in the field of heat transfer enhancement, thereby providing a sound cavitation and titanium dioxide (TiO 2 ) Method and device for controlling boiling heat transfer with nanoparticle composite

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