Heat transfer enhancement of boiling on open-cell copper foam by external circulation of working fluid
To enhance heat transfer of boiling of methanol on open-cell copper foam,an experimental setup of boiling with external circulation of working fluid was established.The bubble behavior on copper foam with different pore densities was observed and dependence of heat transfer on pore density of the copper foams was investigated.The heat transfer performance of the boiling of methanol on open-cell copper foam with external circulation was investigated.The results showed that the external circulation promoted heat transfer coefficient(HTC)and critical heat flux(CHF)of the boiling by 51%and 41%,respectively.The optimal pore density of copper foam for heat transfer of boiling on copper foam with external circulation was 95 PPI,resulting in the maximum HTC of 4.9 W/(cm2·K)and CHF of 107.8 W/cm2.The heat transfer enhancement mechanism for boiling of external circulation improving forced liquid replenishment and bubble departure on copper foam was proposed.
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