论文部分内容阅读
The present study reports an experimental evaluation of heat transfer characteristic of R134 a flow boiling in micro-channel heat sink. The heat sink is composed of 30 parallel rectangular micro-channels with cross-sectional dimensions of 500μm width and depth, as well as total length 30 mm. Experiments were conducted with heat flux up to 80.212 W/cm2, mass velocity ranging from 373.33 to 1244.44 kg/m2 s, vapor quality ranging from 0.06 to 0.9. The wall temperature of heat sink heated could be controlled at around 50℃. Heat transfer coefficient could be up to 180 k W/m2 K. Two dominating flow patterns were observed by analyzing boiling curves. The heat transfer characteristics of nucleate boiling and convective boiling were presented in the study. Revised correlations of R134 a flow boiling in micro-channel heat sink were carried out with the consideration of nucleate boiling and convective boiling mechanisms.
The present study reports an experimental evaluation of heat transfer characteristic of R134 a flow boiling in micro-channel heat sink. The heat sink is composed of 30 parallel rectangular micro-channels with cross-sectional dimensions of 500 μm width and depth, as well as total length 30 mm. Experiments were conducted with heat flux up to 80.212 W / cm2, mass velocity ranging from 373.33 to 1244.44 kg / m2 s, vapor quality ranging from 0.06 to 0.9. The wall temperature of heat sink heated could be controlled at around 50 ° C. Heat transfer coefficient could be up to 180 k W / m2 K. Both heat-applied characteristics of nucleate boiling and convective boiling were presented in the study. Revised correlations of R134 a flow boiling in micro-channel heat sink were carried out with the consideration of nucleate boiling and convective boiling mechanisms.