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第13届国际传热学会年报
Graham de Vahl Davis (open in a new tab) School of Mechanical and Manufacturing Engineering, University of New South Wales, Kensington, NSW, Australia
Eddie Leonardi (open in a new tab) Computational Fluid Dynamics Research Laboratory, School of Mechanical and Manufacturing Engineering, The University of New South Wales, Sydney, Australia 2052

ISSN Online: 2377-424X

ISBN CD: 1-56700-226-9

ISBN Online: 1-56700-225-0

CONDENSATION HEAT TRANSFER ENHANCEMENT FOR STEAM-AIR MIXTURE VAPOUR BY INTERFACIAL BEHAVIOR OF THE FALLING DROPLETS

page 10
DOI: 10.1615/IHTC13.p17.70
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摘要

To get a better understanding of the mechanism of heat transfer enhancement in dropwise condensation with non-condensable gas, dropwise condensation (DWC), filmwise condensation (FWC) and dropwise-filmwise coexisting (DFC) heat transfer with and without non-condensable gas were all performed on specially designed vertical plates. The investigations were concerned with the dynamic behavior near the vapor-liquid interface. The experimental results indicated that the heat transfer characteristics of dropwise condensation of pure steam without non-condensable gas were similar to that of dropwise-filmwise coexisting condensation surface. However, in the presence of non-condensable gas, without the effect of droplets falling movement in the vapor-liquid interface, the heat transfer characteristics of dropwise-filmwise coexisting condensation surface were parallel to that of filmwise condensation surface, and indeed no heat transfer enhancement was found. Compared with the former two condensation modes, the heat transfer coefficient of dropwise condensation with non-condensable gas was enhanced by 30%∼80% for the air mole concentration of 0.9% and 4.8%, respectively. The facts, which were mainly due to the departure behavior of the condensing droplets, make a considerable contribution to the overall heat and mass transfer performance.

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