Annular Two-Phase Flow—Part 1: A Simple Theory

[+] Author and Article Information
G. B. Wallis

Thayer School of Engineering, Dartmouth College, Hanover, N. H.; Creare, Inc., Hanover, N. H.

J. Basic Eng 92(1), 59-72 (Mar 01, 1970) (14 pages) doi:10.1115/1.3424950 History: Received March 20, 1969; Online October 27, 2010


A simple theory for annular two-phase flow is developed in terms of equations for the interfacial and wall shear stresses. Expressions for the pressure drop and void fraction are derived. Criteria for the minimum pressure drop, zero wall shear, and flow regime transition in vertical flow are given. The results are compared with numerous data and alternative theories from the literature.

Copyright © 1970 by ASME
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