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Journal of Enhanced Heat Transfer
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ISSN Imprimir: 1065-5131
ISSN En Línea: 1026-5511

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Journal of Enhanced Heat Transfer

DOI: 10.1615/JEnhHeatTransf.v10.i1.10
pages 1-7

Enhanced Flow Boiling of R-134a in a Minichannel Plate Evaporator

Majid Molki
Department of Mechanical and Industrial Engineering Southern Illinois University Edwardsville, Edwardsville, Illinois 62026
Michael M. Ohadi
Small and Smart Thermal Systems Laboratory, Center for Energy Environmental Engineering, Department of Mechanical Engineering, University of Maryland, College Park, Maryland 20742, USA
A. P. Rupani
Small and Smart Thermal Systems Laboratory, University of Maryland, College Park, Maryland 20742
Francis Henrique Ramos Franca
Federal University of Rio Grande do Sul Sarmento Leite St., n. 425, Cep 90050-170, Porto Alegre, RS, Brazil

SINOPSIS

In this article, we report on heat transfer and pressure drop coefficients for flow boiling ofR-134a in a minichannel formed by two parallel aluminum plates. The channel walls are augmented by means of round beads. The heat transfer coefficients and pressure drops were evaluated for mass fluxes ranging from 40 to 190 kg/m2·s and inlet-exit quality bands of 0.25-0.50, 0.50-0.75, and 0.75-0.90. The minichannel evaporator design was evaluated by comparing its performance with a similar plate with a different number of round beads. These results were also compared with available correlations for a better understanding of the heat transfer mechanism in the minichannel. Over the range of parameters tested, an enhancement of two- to sixfold in the heat transfer coefficient was obtained, compared to smooth tubes with the same nominal area. From the comparison and study of correlations, a simple correlation was proposed that agrees with the experimental data within 20%.