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.
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Annular Two-Phase Flow—Part 1: A Simple Theory
G. B. Wallis
Thayer School of Engineering, Dartmouth College, Hanover, N. H.; Creare, Inc., Hanover, N. H.
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Wallis, G. B. (March 1, 1970). "Annular Two-Phase Flow—Part 1: A Simple Theory." ASME. J. Basic Eng. March 1970; 92(1): 59–72. https://doi.org/10.1115/1.3424950
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