Wettability measurement and criterion for a falling film absorber

Jin Kyeong Kim, Chan Woo Park, Ig Saeng Kim, Jong Soo Jurng, Yong Tae Kang

Research output: Contribution to conferencePaperpeer-review


The objectives of this paper are to develop a new method of wettability measurement and to study the effect of surface roughness on the wettability in a LiBr/H2O falling film absorber. Three absorber tubes with micro-scale roughness are tested in a falling film absorber installed in a test rig. Inlet solution temperature (30 - 50°C), concentration (55-62 weight % of LiBr) and mass flow rate (0.74-2.71 kg/min) 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. Reynolds number is ranged from 30 to 120 by controlling the inlet mass flow rate. The wettability for the structured surfaces was higher than that for the bare tube. The wettability decreased linearly along the vertical location as low as 65 % for the bare tube and 75% for the micro-scale scratched tubes. The wettability increased with increasing the solution temperature and the solution mass flow rate. The effect of film Reynolds number on the wettability in the bare tubes was more significant than that in the micro-scale scratched tubes. The experimental results of wettability can be used in the design of absorbers with micro-scale roughness.

Original languageEnglish
Number of pages6
Publication statusPublished - 2001
Externally publishedYes
Event2001 ASME International Mechanical Engineering Congress and Exposition - New York, NY, United States
Duration: 2001 Nov 112001 Nov 16


Other2001 ASME International Mechanical Engineering Congress and Exposition
Country/TerritoryUnited States
CityNew York, NY

ASJC Scopus subject areas

  • Mechanical Engineering
  • Energy Engineering and Power Technology


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