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TECHNICAL PAPERS: Two-Phase Flow and Heat Transfer

Heat Transfer and Pressure Drop Characteristics During R22 Evaporation in an Oval Microfin Tube

[+] Author and Article Information
Man-Hoe Kim

Department of Mechanical and Industrial Engineering, University of Illinois at Urbana-Champaign, 1206 West Green Street, Urbana, IL 61801e-mail: mankim1@uiuc.edu

Jeong-Seob Shin

Department of Mechanical Engineering, Pohang University of Science and Technology, San 31 Hyoja-Dong, Pohang, Kyungbuk 790-784, Korea

Clark W. Bullard

Department of Mechanical and Industrial Engineering, University of Illinois at Urbana-Champaign, 1206 West Green Street, Urbana, IL 61801

J. Heat Transfer 123(2), 301-308 (Nov 15, 2000) (8 pages) doi:10.1115/1.1351894 History: Received April 28, 2000; Revised November 15, 2000
Copyright © 2001 by ASME
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References

Figures

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Schematic diagram of test rig
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Cross-sectional geometry of the microfin tube tested
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Definition of installation angle
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Average total pressure drops with variation of mass flux
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Comparison of experimental data and friction factor correlation
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Experimental flow patterns on the Taitel-Dukler map
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Circumferential variations of wall temperatures for the round tube: (a) mass flow rate: 30 kg/h; (b) mass flow rate: 60 kg/h.
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Circumferential variations of wall temperatures for the oval tube (0 deg installation angle): (a) mass flow rate: 30 kg/h; (b) mass flow rate: 60 kg/h.
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Circumferential variations of wall temperatures for the oval tube (90 deg installation angle): (a) mass flow rate: 30 kg/h; (b) mass flow rate: 60 kg/h.
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Local heat transfer coefficients: (a) mass flow rate: 30 kg/h; (b) mass flow rate: 60 kg/h.
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Average heat transfer coefficients with variation of mass flux
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Comparison of experimental data and Nu correlation
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Local pressure drops (a) mass flow rate: 30 kg/h; (b) mass flow rate: 60 kg/h.

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