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Journal of Enhanced Heat Transfer
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ISSN Imprimer: 1065-5131
ISSN En ligne: 1026-5511

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Journal of Enhanced Heat Transfer

DOI: 10.1615/JEnhHeatTransf.v10.i4.60
pages 421-430

Wettability Correlation of Microscale Hatched Tubes for Falling Film Absorption Application

Jin-Kyeong Kim
School of Mechanical and Industrial System Engineering, Kyung Hee University, Yong In, Kyung Gi 449-701, Korea
Chan Woo Park
Machinery Research Lab., LG Cable Ltd., Anyang, Kyung Gi 431-080, Korea
Yong Tae Kang
School of Mechanical and Industrial System Engineering, Kyung Hee University, Yong In, Kyung Gi 449-701, Korea; School of Mechanical Engineering, Korea University, Anam-dong, Sungbuk-gu, Seoul, KS013, South Korea

RÉSUMÉ

The objectives of this article are to develop a new method of wettability measurement and to study the effect of microscale surface treatment on the wettability across horizontal tubes in a H2O/LiBr falling film absorber. Three types of microscale hatched tubes with various degrees of roughness are tested in a test rig. Inlet solution temperature (30.50 °C), concentration (55.62 wt% of LiBr), and mass flow rate (0.74.2.71 kg/min) are considered as key parameters. Reynolds number ranged from 30 to 120 by controlling the inlet mass flow rate. The wettability on the microscale hatched tubes was higher than that for the smooth tubes. The wettability decreased linearly along the vertical location, but was proportional to the solution temperature and mass flow rate. The experimental correlations of the wettability for the smooth and the microscale hatched tubes were developed with error bands of ±20% and ±10%, respectively.


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