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International Heat Transfer Conference 7

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

AN ANALYTICAL MODEL FOR CONDENSING AND EVAPORATING TWO-COMPONENT TWO-PHASE ANNULAR FLOW

John A. Tichy
Department of Mechanical Engineering Rensselaer Polytechnic Institute, Troy, New York 12181

Nelson A. Macken
Department of Mechanical Engineering Rensselaer Polytechnic Institute, Troy, New York 12181

Walter M. Duval
Department of Mechanical Engineering Rensselaer Polytechnic Institute, Troy, New York 12181; NASA Glenn Research Center, Cleveland, OH 44135

DOI: 10.1615/IHTC7.540
pages 161-166

Abstract

This paper describes an analytical model for determining heat transfer in horizontal two-phase condensing and evaporating two-component annular flow. Computations are presented for the case of volatile component (refrigerant) and small amounts of a nonvolatile component (oil) in the liquid layer. The analysis is based on the momentum and energy equations with the heat transfer in the liquid film determined using the Reynolds analogy between turbulent heat and momentum transfer. Two separate methods are developed for extending this model to include the effects of the two-component nature of the flow. In the first procedure, average (lumped) property values are computed assuming ideal mixing occurs in the liquid phase. In the second approach, the species diffusion equation is also considered, and a variable (local) property solution is obtained. Solutions are compared to a similar analysis of single component two-phase flow and to experimental data of another investigator.

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