Abstract
Overall heat transfer characteristics were measured for film-wise free-convective condensation of CO_2-steam mixture and air-steam mixture upon a cooled horizontal tube. The test tube is of stainless steel and 25.4mm outer diameter. The range of non-condensable gas fraction was 10-55 wt%. First, method of obtaining mean temperature of tube surface was studied. Heat transfer characteristics of CO_2-steam mixture were examined under decompressed condition, and compared with those of air-steam mixture. Influence of ambient pressure upon heat transfer characteristics was also examined. Finally, the rate of heat transfer degradation by the non-condensable gas was evaluated.
