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TECHNICAL PAPERS: Evaporative Boiling and Condensation

Condensation of Zeotropic Mixtures in Horizontal Tubes: New Simplified Heat Transfer Model Based on Flow Regimes

[+] Author and Article Information
D. Del Col, A. Cavallini

Dipartimento di Fisica Tecnica, Università di Padova, I-35131, Padova, Italy

J. R. Thome

Laboratory of Heat and Mass Transfer, Faculty of Engineering Science and Technology, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland

J. Heat Transfer 127(3), 221-230 (Mar 24, 2005) (10 pages) doi:10.1115/1.1857951 History: Received October 31, 2003; Revised November 17, 2004; Online March 24, 2005
Copyright © 2005 by ASME
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References

Figures

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Top: simplified flow structures for two-phase flow patterns. Bottom: actual geometry (left) and equivalent simplified geometry (right) for fully stratified flow.
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Schematic of the convective and falling film boundaries in the heat transfer model
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Ratio of calculated-to-experimental heat transfer coefficient vs vapor Reynolds number in stratified flow regime. The predicted values are obtained without using the mixture factor Fm. Data by Cavallini et al. 910.
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Ratio of calculated-to-experimental heat transfer coefficient vs vapor Reynolds number in stratified flow regime. The mixture factor Fm is used in the prediction. Data by Cavallini et al. 910.
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Comparison of model to data by Cavallini et al. 910
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Ratio of calculated-to-experimental heat transfer coefficient vs vapor Reynolds number. Data by Cavallini et al. 910.
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Comparison of model to data by Lee 11 and by Kim et al. 13
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Comparison of model to data by Cavallini et al. 910 by vapor quality, mass velocity, and flow pattern
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Comparison of model to data by Lee 11 and Kim et al. 13 by vapor quality, mass velocity, and flow pattern
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Comparison of model to all data by temperature glide
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Percentage of data points predicted to a certain deviation vs deviation
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Simulation of model for condensation of R290/600 (50/50% by mass) at 0.9 MPa in a 8 mm inside diameter tube

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