Experimental Study on Subcooled Boiling of Fluorocarbon Coolant in the Vertical Pin-Finned Channel
In order to improve the cooling system of high-power electronic equipment,the subcooled boiling experiments of fluorocarbon coolant in the vertical channel with staggered pentagon pin fins are carried out.The heat flux,inlet velocity and subcooled degree are 50～400 kW·m-2,0.1～0.9 m·s-1 and 14～29℃,respectively.The results show that the average heat transfer coefficient and pressure drop generally increase with the increase of heat flux,and the heat transfer factor increases when the inlet velocity is greater than 0.5 m·s-1.With the increase of inlet velocity,the average heat transfer coefficient decreases at first and then increases at middle and high heat fluxes,and the heat transfer factor obviously decreases in the range of heat flux studied.As the subcooled degree increases,both the average wall temperature and average heat transfer coefficient decrease,and the heat transfer factor decreases when the inlet velocity is greater than 0.5 m.s-1.
subcooled boiling experimentvertical channelminute pin-finheat transfer and pres-sure drop
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