Abstract
Direct-contact heat exchangers have received increasing attention in recent years because of their simplicity of construction, compactness, and high heat transfer rate. The present experiments were undertaken to provide technical data for the design of jet-type direct-contact heat exchangers in the laminar flow range. Flow instability and the transition from a circular jet to droplets were observed and discussed. A comparison between the measured heat transfer rate and the heat transfer rate predicted by Jacobs and Nadig's (1987) analytical models for a laminar circular jet is also given in the present investigation. It is found that the measured heat transfer rate is slightly slower than that predicted by Jacobs and Nadig's analytical model for pure vapor; however, the experimental data agree well with the analytical solution the effects of the air content in steam are taken into account.
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