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TECHNICAL PAPERS: Boiling and Condensation

Condensation of Refrigerants in Horizontal, Spirally Grooved Microfin Tubes: Numerical Analysis of Heat Transfer in the Annular Flow Regime

[+] Author and Article Information
S. Nozu

Department of Systems Engineering, Okayama Prefectural University, 111, Kuboki, Soja, Okayama 719-1197, Japan e-mail: nozu@cse.oka-pu.ac.jp

H. Honda

Institute of Advanced Material Study, Kyushu University, 6-12, Kasuga-Kouen, Kasuga, Fukuoka 816-8580, Japan

J. Heat Transfer 122(1), 80-91 (Aug 01, 1999) (12 pages) doi:10.1115/1.521439 History: Received August 27, 1998; Revised August 01, 1999
Copyright © 2000 by ASME
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References

Figures

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Schematic diagram of experimental apparatus
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Comparison of measured and predicted Nud values: effect of mass velocity, tube M1
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Comparison of measured and predicted Nud values: effect of fluid properties, tube M3
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Comparison of measured and predicted local heat transfer coefficients: tubes M1 and M2
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Comparison of measured and predicted local heat transfer coefficients: tube M3
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Fin profile per one half of fin pitch in a-a cross section; nondimensionalized by fin pitch
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Circumferential variation of condensate behavior: tube M1, G=170 kg/(m2s),X=0.4
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Physical model and coordinates
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Comparison of measured and predicted Nud values; effect of fin dimensions, tubes M1 and M2
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Axial development of condensate profile: (a) tube M1, (b) tube M2
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Illustration of a subsection
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Axial distributions of measured quantities, G≅300 kg/(m2s): (a) tube S1, (b) tube M1, (c) tube M2
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Details of observation devices attached to tube exit; side-viewing type scope

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