Promoting Subcooled Pool Boiling Heat Transfer via Induced Microbubbles
The effect of induced microbubbles on subcooled pool boiling heat transfer of water was studied experimentally.A bubble generator made of microporous titanium foam is used to generate a large number of microbubbles to flush the heated wall to enhance heat exchange.This is the first study on the mechanism of boiling heat transfer in subcooled pool using induced microbubbles.Microbubbles enhance the boiling heat transfer in the subcooled pool by providing gasification nu-cleation sites to enhance latent heat transfer,flush the bubble/film of the hot wall to promote their departure and induce disturbances in convection.The results show that adding microbubbles can increase the heat transfer coefficient and suppress the wall superheating.For inclined hot walls,the heat transfer enhancement of microbubbles perform most effectively in the region of high subcooling and low heat flux.
heat transfer enhancementphase change heat transfermicrobubblespool boilingsubcooling
NETL
NSTL
万方数据
