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ISSN Online: 2377-424X

ISBN Print: 0-89116-559-2

International Heat Transfer Conference 8
August, 17-22, 1986, San Francisco, USA

FILM CONDENSATION OF ETHYLENE GLYCOL ON A HORIZONTAL TUBE AT HIGH VAPOUR VELOCITY

Get access (open in a dialog) DOI: 10.1615/IHTC8.20
pages 1607-1612

Abstract

New heat-transfer measurements are reported for condensation of ethylene glycol on a single horizontal tube with vertical vapour downflow. Experiments have been conducted with vapour pressures in the range 1 kPa to 20 kPa. Vapour velocities up to 135 m/s (Mach no. ≈ 0.6) were obtained. The results are in general agreement with laminar boundary-layer models. However, at the highest vapour velocities the effect of pressure variation around the tube was found to affect the results significantly. Also at the lowest pressures the interface mass-transfer resistance was important. For much of the velocity range the vapour-side heat-transfer coefficient was found to be roughly proportional to the square root of vapour velocity as indicated by theory for a laminar condensate film. With increasing velocity evidence was found of a stronger velocity dependence, possibly indicating transition to turbulent flow.