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TECHNICAL PAPERS: Heat Pipes

A New Two-Phase Flow Map and Transition Boundary Accounting for Surface Tension Effects in Horizontal Miniature and Micro Tubes

[+] Author and Article Information
Ahmadali Tabatabai, Amir Faghri

Department of Mechanical Engineering, University of Connecticut, Storrs, CT 06269-3139

J. Heat Transfer 123(5), 958-968 (Jan 22, 2001) (11 pages) doi:10.1115/1.1374440 History: Received July 12, 2000; Revised January 22, 2001
Copyright © 2001 by ASME
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References

Figures

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Flow patterns of two-phase condensation flow in capillary horizontal tubes
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Equivalent liquid and gas fraction in two-phase flow in a horizontal tube
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Schematic of force balance elements for a given unit length of flow
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Proposed generalized flow map with transition boundaries
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Effect of tube diameter on transition boundaries for the proposed flow map for two-phase condensation horizontal flow of R-12 at Tsat=83.4°C
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Effect of working fluid (steam at 110°C and R12 at 83.4°C) surface tension on transition boundaries for the proposed flow map for flow in 4 mm horizontal tube
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Comparison of proposed flow map and transition boundaries for two-phase flow in horizontal tubes with experimental data for air (20°C)/water (15°C): (a) 1 mm; (b) 2 mm; (c) 3 mm; (d) 4 mm (air and water at 25°C); (e) 5 mm.
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Comparison of proposed flow map and transition boundaries for two-phase condensation flow in horizontal tubes with experimental data for R-113: (a) 4.76 mm (Tsat=143.9°C); and (b) 12.7 mm (Tsat=139.1°C).
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Comparison of proposed transition boundaries in horizontal tubes with flow map and regimes of Mandhane et al. 10 (Mandhane et al. regimes spelled in small letters): (a) air (20°C)/water (15°C) in 1 mm; and (b) R113 (143.9°C) in 4.76 mm.
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Comparison of proposed transition boundaries in horizontal tubes with flow map and regimes of Tandon et al. 8 (Tandon et al. regimes spelled in small letters): (a) air (20°C)/water (15°C) in 1 mm; and (b) R113 (143.9°C) in 4.76 mm.

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