Forced Convective Heat Transfer in the Condensation of Pure Vapour Jets on a Vertical Tube PDF

Keywords

steam, heat transfer, jetwise flow

Abstract

Experimental investigations for the effect of jetwise flow of condensing steam on a single vertical tube have been carried out. The variables covered included orifice diameter, heat load and steam velocity. Particular emphasis has been laid on making direct comparison between normal flow of vapour and high jet vapour velocities. It has been found that the streamside coefficient of heat transfer was increased by the jetwise flow to values of 2.0 to 9.55 times the value for stationary vapour. The corresponding vapour pressure loss to induce the jetwise was 4.7 and 50.0 cm Hg, respectively. The high dependence of the heat transfer enhancement on the jet driving force is presented. The jetwise flow approach may find direct applications in industries where high pressure steam is available.