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Improved thermal boundary layer parameter for semitheoretical refrigerant/lubricant pool boiling model.
Author(s) : KEDZIERSKI M. A.
Summary
The paper outlines the framework for an improvement in the thermal boundary layer parameter for a semitheoretical model for predicting the pool boiling heat transfer of refrigerant/lubricant mixtures on a roughened, horizontal, flat pool-boiling surface. Refrigerant/lubricant pool boiling is significantly influenced by the excess lubricant that resides in a thin layer on the boiling surface. The model is based on lubricant excess surface density measurements and a mass balance on lubricant deposition and removal from the wall. The original thermal boundary layer parameter that was derived for R123/lubricant mixtures predicts the R134a/lubricant data presented in the paper for superheats below 6 K. The improvement in the thermal boundary layer enables the model to predict the full range of wall superheats for the R134a/lubricant mixture measurements. Further work on the new thermal boundary layer parameter is necessary to include the effects of the lubricant composition, viscosity, and critical solution temperature with the refrigerant. These effects were included in the original thermal boundary layer parameter. The new thermal boundary layer parameter increases the range of superheats for which the model is valid for the R134a/lubricant pool boiling heat transfer measurements presented.
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Details
- Original title: Improved thermal boundary layer parameter for semitheoretical refrigerant/lubricant pool boiling model.
- Record ID : 2004-2734
- Languages: English
- Source: 21st IIR International Congress of Refrigeration: Serving the Needs of Mankind.
- Publication date: 2003/08/17
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Indexing
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Themes:
Mass transfer;
Lubricants - Keywords: Pool boiling; Lubricant; Boundary layer; Heat transfer; Research; Horizontal plate; Parameter; Mixture; Expérimentation; Refrigerant
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