RESEARCH PAPERS: Phase Change and Multiphase Heat Transfer

Modeling the Characteristics of Thermally Governed Transient Flow Surges in Multitube Two-Phase Condensing Flow Systems With Compressibility and Thermal and Flow Distribution Asymmetry

[+] Author and Article Information
G. L. Wedekind, C. J. Kobus, B. L Bhatt

Department of Mechanical Engineering, Oakland University, Dodge Hall of Engineering, Rochester, MI 48309-4401

J. Heat Transfer 119(3), 534-543 (Aug 01, 1997) (10 pages) doi:10.1115/1.2824134 History: Received June 17, 1996; Revised April 29, 1997; Online December 05, 2007


In a tube-type condenser involving complete condensation, small changes in the inlet vapor flow rate momentarily cause very large transient surges in the outlet mass flow rate. An Equivalent Single-Tube Model (ESTM), based on the System Mean Void Fraction Model, is developed that predicts these transient flow surges for a multitube system; including the effects of compressibility as well as thermal and flow distribution asymmetry. The model is verified theoretical and experimentally. From a design perspective, the significant value of the ESTM is that it includes the primary physical mechanisms involved in such complex flow transients, yet is simple enough to be solved on typical “spreadsheet” software.

Copyright © 1997 by The American Society of Mechanical Engineers
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