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强化传热期刊
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ISSN 打印: 1065-5131
ISSN 在线: 1026-5511

强化传热期刊

DOI: 10.1615/JEnhHeatTransf.2013007609
pages 235-250

CONDENSATION HEAT TRANSFER AND PRESSURE DROP OF R-410A IN THREE 7.0MM OUTER DIAMETER MICROFIN TUBES HAVING DIFFERENT INSIDE GEOMETRIES

Nae-Hyun Kim
Department of Mechanical Engineering, Incheon National University, 12-1 Songdo-Dong, Yeonsu-Gu Inchon, 22012, Korea
H. W. Byun
Department of Mechanical Engineering, University of lncheon, 12-1, Songdo-Dong, Yeonsu-gu, Incheon, 406-772, Republic of Korea
J. K. Lee
School of Mechanical System Engineering, Incheon National University, Incheon, Korea

ABSTRACT

R-410A condensation heat transfer and pressure drop data are provided for three different 7.0 mm outer diameter microfin tubes. The microfin tubes had different helix angles, fin heights, and fin apex angles. Tests were conducted for a range of quality (0.2 ∼ 0.8), mass flux (345 kg/m2s ∼ 604 kg/m2s), and saturation temperature (45°C ∼ 55°C). It was found that a microfin tube having a larger interfin area or smaller helix angle is more beneficial for condensation heat transfer. Increased flow velocity in the interfin region along with stronger turbulence and surface tension induced drainage for sharper fins may be responsible for the increase of heat transfer coefficient. Pressure drop was also larger in a microfin tube having a larger apex angle. Both heat transfer coefficient and pressure drop increased as mass flux or quality increased. However, they decreased as saturation temperature increased. The range of heat transfer enhancement factor (1.23 ∼ 1.83) was comparable with that of the pressure drop penalty factor (1.36 ∼ 2.26). Data are compared with available heat transfer and pressure drop correlations.


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