微结构表面微重力下沸腾换热及临界机理研究

The pool boiling heat transfer performance of bistructured surface based on micro-pin-finned structure was experimentally studied in FC-72 under microgravity. The changing trend of wall temperature and bubble dynamic of three different heat fluxes were detected, and the boiling phenomenon at boiling crisis was also analyzed. The experimental results show that at mid-low heat fluxes the wall temperatures and heat transfer coefficients are the same as under normal gravity. At high heat flux the wall temperature can maintain stable while entering microgravity until the heating surface is totally covered by a huge bubble. The bistrcutured surface has a strong capillary wick effect owing to its special microstructures and grooves, which can efficiently improve the velocity of liquid supply and enhance the CHF(Critical Heat Flux).