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ISSN: 1065-5131 Print
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Pages: 60
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The Effect of Augmented Surfaces on Two-Phase Flow Instabilities in a Horizontal System
F. Widmann
Department of Mechanical Engineering, University of Miami, Coral Gables, Florida 33124, USA
Omer Comakli
Department of Mechanical Engineering, Ataturk University, TR-25240 Erzurum, Turkey
Claudia O. Gavrilescu
Department of Mechanical Engineering, University of Miami Coral Gables, FL 33124, USA
Y. Ding
Department of Mechanical Engineering, University of Miami, Coral Gables, Florida 33124, USA
Sadik Kakac
Department of Mechanical Engineering, University of Miami, P.O. Box 248294 - Coral Gables, Florida - 33124-0624 - USA
ABSTRACT
This experimental research covers the investigation of two-phase flow instabilities in a horizontal in-tube flow boiling system with augmented heat transfer surfaces. The effect of augmentation on flow instabilities is studied with three tubes made of different inner surfaces at five different inlet temperatures. All experiments are carried out at constant heat input, system pressure and exit restriction. Steady-state characteristics of a system composed of different tubes are found and presented in pressure-drop versus mass flow rate diagrams. Dynamic instabilities, such as pressure-drop type, thermal and density-wave type oscillations are found to occur in every system and boundaries for the appearance of these oscillations are found. The dependence of the characteristics of these oscillations on the augmented surfaces is emphasized and comparisons between the bare tube and the augmented tubes are made.
pages 263-271
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