Experimental study on enhancement of flow boiling through degassing with copper foam
As an efficient heat exchange method,flow boiling is widely used in the cooling of high heat flow equipment.An independent porous hydrophobic structure designed in the flow boiling can promote the boiling bubble's departure and provide a new method to enhance the boiling heat transfer.Under various conditions including the inlet temperatures of liquid at 70,75,and 80℃,flow velocity of 6.94,10.42,and 13.89 cm/s,the flow pattern changes,the bubble suction process into copper foam and its effect on heat transfer performance were monitored.Based on the force analysis of boiling bubbles,the enhancement mechanism of superhydrophobic foam was obtained.As a result,the wall superheat decreases by 20.7%at high heat flux,and the heat flux is improved to 152%when the degassing rate of copper foam reaches 0.81 during experiments.The inlet flow velocity shows an obvious effect on the degassing process and heat transfer enhancement performance,while,the effect of inlet temperature can be ignored.
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