IIR document
Flow patterns and heat and mass transfer coefficients of low Reynolds number falling film flows on vertical plates: effects of a wire screen and an additive.
Author(s) : KIM D. S., INFANTE FERREIRA C. A.
Type of article: Article, IJR article
Summary
The effects of the surface geometry and of a surfactant on the characteristics of LiBr-water solution falling films are experimentally investigated. Two different surfaces (flat copper plate and the same copper plate covered with a copper wire screen) are tested with four fluids (pure water and 50% lithium bromide-water solution with or without 100 ppm of 2-ethyl-1-hexanol) for Reynolds numbers from 40 to 110. Flow patterns and heat and mass transfer coefficients are discussed. Marangoni convection was observed in water-cooled LiBr-water flows resulting in significant heat and mass transfer enhancement. 2-ethyl-1-hexanol enhances heat and mass transfer in LiBr-water flows by more than a factor of two. 2-ethyl-1-hexanol in water makes copper surface strongly hydrophobic. The wire screen promotes absorption process in adiabatic conditions but hinders the process in non-adiabatic conditions by reducing the Marangoni convection induced by 2-ethyl-1-hexanol. The experimental heat and mass transfer coefficients are presented in dimensionless forms.
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Details
- Original title: Flow patterns and heat and mass transfer coefficients of low Reynolds number falling film flows on vertical plates: effects of a wire screen and an additive.
- Record ID : 2009-0159
- Languages: English
- Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 32 - n. 1
- Publication date: 2009/01
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