Pool boiling heat transfer coefficients of R134a with different lubricant mass fractions for one smooth tube and five enhanced tubes were tested at a saturation temperature of 6°C⁠. The lubricant used was polyvinyl ether. The lubrication mass fractions were 0.25%, 0.5%, 1.0%, 2.0%, 3.0%, 5.0%, 7.0%, and 10.0%, respectively. Within the tested heat flux range, from 9000 W/m2 to 90,000 W/m2⁠, the lubricant generally has a different influence on pool boiling heat transfer of these six tubes.

Issue Section:
Evaporation, Boiling, and Condensation
Keywords:
boiling, heat transfer, lubricants, mixtures, pipe flow, polymers, nucleate pool boiling, enhancement heat transfer, lubricant
Topics:
Boiling, Heat transfer, Heat transfer coefficients, Lubricants, Heat flux, Refrigerants, Pool boiling, Temperature
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