ISSN Online: 2377-424X
ISBN Print: 978-1-56700-421-2
International Heat Transfer Conference 15
Boiling Investigation in the Microchannel with Nano-Particles Coating
Abstrakt
Microchannel heat exchangers for future and micro heat pipes must provide an extremely high heat flux. It will be difficult to solve the problem of cooling by common methods in these devices. At the same time usual heat transfer enhancement methods may not be applicable due to the small size of these heat exchangers. The present investigation is directed to solve problems of an effective cooling at high heat flux in microchannels and CHF increasing with help of an artificial nanorelief of the surface. The relief is formed by alumina nanoparticles which are deposited on the heating surface of the channel. It is determined that the CHF for the microchannel with the nanorelief is twice higher. Experimental data is also obtained for the region of transition boiling, the transition boiling heat transfer coefficient is higher for the surface with nanorelief too. The volumetric steam content in the microchannel boiling was defined by the proposed method.
SCHLÜSSELWÖRTER:
Boiling and evaporation, Heat transfer enhancement, microchannel, nano-relief, contact angle