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RESEARCH PAPERS: Falling Film Heat Transfer

The Intertube Falling Film: Part 1—Flow Characteristics, Mode Transitions, and Hysteresis

[+] Author and Article Information
X. Hu, A. M. Jacobi

Department of Mechanical and Industrial Engineering, University of Illinois at Urbana–Champaign, 1206 W. Green Street, Urbana, IL 61801

J. Heat Transfer 118(3), 616-625 (Aug 01, 1996) (10 pages) doi:10.1115/1.2822676 History: Received September 01, 1995; Revised April 26, 1996; Online December 05, 2007

Abstract

When a liquid film falls from one horizontal tube to another below it, the flow may take the form of discrete droplets, jets, or a continuous sheet; the mode plays an important role in the wetting and heat transfer characteristics of the film. Experiments are reported that explore viscous, surface tension, inertial, and gravitational effects on the falling-film mode transitions. New flow classifications, a novel flow regime map, and unambiguous transition criteria for each of the mode transitions are provided. This research is part of an overall study of horizontal-tube, falling-film flow and heat transfer, and the results may have important implications on the design and operation of falling-film heat exchangers.

Copyright © 1996 by The American Society of Mechanical Engineers
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