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Examination of two-phase behaviors in porous media during pool boiling
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The enhancement of pool boiling heat transfer using porous media has been extensively studied.Although the two-phase distribution and evolution in porous media are crucial to the heat transfer performance,including the critical heat flux(CHF)and heat transfer coefficient(HTC),direct observation of the two-phase flow inside the media is limited owing to the blockage of the direct view from the porous structures.In this study,pool boiling visualization experiments were conducted on porous samples with different throat widths in deionized water.The results showed that the HTC increased with the throat width.Additionally,the growth-contraction cycle of the vapor region and the formation and drying of the wall liquid film inside the porous media were investigated.The vapor region,including the maximum and minimum areas in the boiling cycle,was quantitatively described.Furthermore,the relationship between the minimum gas-phase area and HTC peak was identified.A one-dimensional transient model was developed considering solid skeleton heat conduction,liquid film evaporation,and vapor region growth to quantitatively study the influence of heat flux on the internal two-phase flow.The model successfully captured the maximum gas-phase area,duration of boiling cycles,and HTC trends at specific heat fluxes.The results of this quantitative study provide insights into the internal two-phase distribution and evolution induced by pool boiling.
porous mediatwo-phase behaviorspool boiling
ZHANG ZhiHao、GUAN ShuYa、WU Rui、ZHAO ChangYing
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School of Mechanical Engineering,Shanghai Jiao Tong University Shanghai 200240,China
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