Wettability Correlation of Microscale Hatched Tubes for Falling Film Absorption Application

Jin Kyeong Kim, Chan Woo Park, Yong Tae Kang

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)421-430
Number of pages10
JournalJournal of Enhanced Heat Transfer
Issue number4
Publication statusPublished - 2003 Oct
Externally publishedYes


  • Absorber
  • Falling film
  • Microscale treatment
  • Roughness
  • Wettability

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes


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