The effect of micro-scale surface treatment on heat and mass transfer performance for a falling film H2O/LiBr absorber

Jin Kyeong Kim, Chan Woo Park, Yong Tae Kang

Research output: Contribution to journalArticle

55 Citations (Scopus)

Abstract

The objectives of this paper are to develop a new method of wettability measurement, to study the effect of micro-scale surface treatment on the wettability across horizontal tubes and to apply it for numerical analysis of heat and mass transfer in a H2O/LiBr falling film absorber. Three types of tubes with 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 roughened 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 roughened tubes were developed with error bands of ±20 and ±10%, respectively. These are used for the heat and mass transfer analysis of absorbers with micro-scale hatched tubes.

Original languageEnglish
Pages (from-to)575-585
Number of pages11
JournalInternational Journal of Refrigeration
Volume26
Issue number5
DOIs
Publication statusPublished - 2003 Aug 1
Externally publishedYes

Keywords

  • Absorber
  • Absorption system
  • Falling film
  • Heat transfer
  • Horizontal tube
  • Mass transfer
  • Surface
  • Treatment

ASJC Scopus subject areas

  • Food Science
  • Mechanical Engineering

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