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Heat Transfer Analysis for dropwise-filmwise hybrid surface of Steam on Vertical Plate

Journal of Thermal Science 2021年第3期30卷 962-972页

作者： ALHASHEM Abdulwahab KHAN Jamil School of Technological Studies Public Authority for Applied Education and TrainingSafat 13092Kuwait Mechanical Engineering Department College of Engineering and ComputingUniversity of South CarolinaColumbiaSC 29201USA

A model is proposed to predict and evaluate the heat transfer characteristics of dropwise-filmwise hybrid *** is approached by modifying the original drop-size distribution,which is defined for fully dropwise condensation(DWC)and making it applicable for dropwise-filmwise condensation(DFC).The modification is achieved by simulation work to determine two parameters:the area fraction occupied by large drops f and the ratio of the maximum radius of newly formed drops to that of larger drops γ.Simulation results show a good agreement with the literature for fully DWC and provide a correlation for each parameter with respect to DWC region width in the DFC hybrid *** present model evaluates the heat transfer performance of DFC by utilizing these correlations.A comparison is made between the proposed model with experimental work from the literature and results show a good *** changing filmwise condensation(FWC)region width significantly affects the overall heat transfer performance,utilizing smaller width to that of DWC region has the advantage over fully ***,surface renewal within the hydrophobic region is controlled by adjusting the DWC region *** the ratio of drop maximum diameter to DWC region width is unity,surface renewal is achieved by drops merging to adjacent FWC regions *** the ratio is less than unity,surface renewal is achieved by sweeping of departing drops within the hydrophobic region and by *** each case,an optimum DWC region width which corresponds to the maximum DFC heat flux is defined.

关键词： dropwise-filmwise hybrid surface dropwise condensation region width filmwise condensation region width drop-size distribution maximum radius to region width ratio

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