Experimental investigation of local flow boiling heat transfer and pressure drop characteristics in microgap channel

摘要: Abstract Two-phase microgap channel cooling concept has been recently proposed for the heat sources directly in application of electronic devices thermal management. This is relatively new and more research should be carried out systematically to investigate size effects on transfer pressure drop mechanisms. In this study, local flow boiling phenomenon different sizes investigated experimentally. Experiments are performed silicon based sink having depth 190 μm, 285 μm 381 μm, using deionized water with inlet temperature 86 °C. The mass flux coefficient characteristics examined by three fluxes 420 kg/m2 s, 690 kg/m2 s 970 kg/m2 s effective varying from 0 110 W/cm2. An array integrated micro-temperature sensors used study obtain temperatures subsequently coefficients determined. Apart these experimental investigations, simultaneous high speed visualizations conducted observe explore mechanism channel. results show that dependent gap size, lower higher coefficient. Moreover, it observed confined slug annular dominant mechanisms channels after onset nucleate boiling. Hence, increases significantly because thin film evaporation during at flux. also evaluates effectiveness technology, eliminate gradient hotspots.