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

A nanoparticle and titanium dioxide technology, applied in heat transfer modification, heat exchange equipment, lighting and heating equipment, etc., can solve problems such as boiling heat transfer enhancement and boiling heat hysteresis
CN101294780AInactive Publication Date: 2008-10-29INST OF ENGINEERING THERMOPHYSICS - CHINESE ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
INST OF ENGINEERING THERMOPHYSICS - CHINESE ACAD OF SCI
Publication Date
2008-10-29
Estimated Expiration
Not applicable · inactive patent

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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.
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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...

Claims

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