科研之友
微信
新浪微博
Facebook
分享链接
摘要
The present study integrates a spray impingement heat sink and a compact vapor compression cooling system driven by a R-134a small-scale oil-free linear compressor. The cooling strategy is based on the impact of multiple cylindrical jets at a single point to create a low-pressure spray that impinges on a heated surface. An experimental performance evaluation is presented focusing on the influence of the applied thermal load, orifice-to-surface distance (jet chamber height), number of colliding jets and hot reservoir temperature. For a hot reservoir temperature of 25 degrees C, the heat sink configuration with three colliding jets and a jet chamber height of 23.8 mm sustained imposed thermal loads as high as 225 W (heat flux of 354.7 kW/m(2)), maintaining the impingement surface temperature below 40 degrees C with a refrigerant mass flow rate measured at approximately 5 kg/h. The resulting average heat transfer coefficients ranged from 7.5 to 18.1 kW/(m(2) K), and calculated vapor mass qualities as high as 0.93 have been achieved at the outlet of the cooling unit. High-speed video sequences showing the interaction between the impinging spray and the heated surface were collected to help illustrate the phase change heat transfer mechanisms and the influence of the independent variables.
- 出版日期2018-10
