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Experimental Correlation of Wettability for Micro-scale Hatched Tubes  

김진경 (경희대학교 대학원)
박찬우 (LG전선(주) 기계연구소)
이경엽 (경희대학교 기계산업시스템공학부)
강용태 (경희대학교 기계산업시스템공학부)
Publication Information
Korean Journal of Air-Conditioning and Refrigeration Engineering / v.15, no.1, 2003 , pp. 19-24 More about this Journal
Abstract
The objectives of this paper are to develop a new method of wettability mea-surement and to study the effect of surface roughness on the wettability in a $H_2O$/LiBr falling film absorber. Two absorber tubes with micro-scale roughness and a bare tube are tested in a falling film absorber installed in a test rig. Inlet solution temperature, concentration and mass flow rate are considered as key parameters. A new method is proposed to estimate the wettability of a tube by measuring a minimum mass flow rate to wet the tube completely. The wettability for the structured surfaces was higher than that for the bare tube. The wettability decreased linearly along the vertical location. The wettability increased with increasing the solution temperature and the solution mass flow rate. The experimental correlations of the wettability for the bare and the micro-hatched tubes were developed with error bands of$\pm20%\;and\;\pm10%$, respectively. This work can be used in the design of absorbers with micro-scale roughness.
Keywords
Wettability; Micro-scale hatched tube; Roughness; Patternator; LiBr; Absorber;
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