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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-474-8

ISBN Online: 978-1-56700-473-1

International Heat Transfer Conference 16
August, 10-15, 2018, Beijing, China

STUDY ON EFFECT OF COUNTER-CURRENT AIR FLOW ON FLOW BEHAVIOR OF LIQUID FALLING FILM OUTSIDE HORIZONTAL TUBES

Get access (open in a dialog) DOI: 10.1615/IHTC16.mpf.023707
pages 6529-6536

Abstract

In this paper, the volume-of-fluid (VOF) method is used to simulate the falling process of liquid film outside the horizontal tubes. The corresponding Re number is 574 and the cross-section area of the wind tunnels is 50 mm*20 mm. The tube bundles are 1*2 (column*row) and the tube diameter is 25.4 mm. The counter-current air flow velocity ranges from 0 to 3 m/s and the interval velocity is 0.5 m/s. The 3-D numerical simulation results show that the liquid film thickness on the upper tube slightly decreases with the increasing velocity of counter-current air flow. The liquid film on the lower tube becomes thinner as the counter-current air flow velocities increase. The stability of falling film flow mode is barely affected by the small counter-current air flow velocities. However, the stable flow mode is destroyed when the air velocity increases to a certain value, and the flow mode transforms from the stable sheet mode to sheet-jet mode.