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

Author(s) : KIM J. K., PARK C. W., KANG Y. T., et al.

Type of article: Article, IJR article

Summary

The objectives of this paper were 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 roughened tubes were 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) were considered as key parameters. Reynolds numbers ranged from 30 to 120 by controlling the inlet mass flow rate. The wettability on the roughened tubes was higher than that of 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 were used for the heat and mass transfer analysis of absorbers with micro-scale hatched tubes.

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Pages: 575-585

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Details

  • Original title: The effect of micro-scale surface treatment on heat and mass transfer performance for a falling film H2O/LiBr absorber.
  • Record ID : 2003-2173
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 26 - n. 5
  • Publication date: 2003/08

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