IIR document
Effect of CuO nanolubricant on R134a pool boiling heat transfer.
Author(s) : KEDZIERSKI M. A., GONG M.
Type of article: Article, IJR article
Summary
This paper quantifies the influence of CuO nanoparticles on the boiling performance of R134a/polyolester mixtures on a roughened, horizontal, flat surface. A lubricant based nanofluid (nanolubricant) was made with a synthetic ester and CuO particles. For the 0.5% nanolubricant mass fraction, the nanoparticles caused a heat transfer enhancement relative to the heat transfer of pure R134a/polyolester (99.5/0.5) of between 50 and 275%. A smaller enhancement was observed for the R134a/nanolubricant (99/1) mixture, which had a heat flux that was on average 19% larger than that of the R134a/polyolester (99/1) mixture. Further increase in the nanolubricant mass fraction to 2% resulted in a still smaller boiling heat transfer improvement of approximately 12% on average. Thermal conductivity measurements and a refrigerant/lubricant mixture pool-boiling model were used to suggest that increased thermal conductivity is responsible for only a small portion of the heat transfer enhancement due to nanoparticles.
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Details
- Original title: Effect of CuO nanolubricant on R134a pool boiling heat transfer.
- Record ID : 2009-1447
- Languages: English
- Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 32 - n. 5
- Publication date: 2009/08
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Indexing
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Themes:
HFCs;
Heat transfer;
Lubricants - Keywords: R134a; Pool boiling; Polyolester; Oxide; Copper; Lubricant; Heat transfer; Particle; Binary mixture; Expérimentation; Refrigerant; Heat exchanger; Additive
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