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Effect of Al2O3 Nanolubricant on a Passively Enhanced R134a Pool Boiling Surface

Published

Author(s)

Mark A. Kedzierski

Abstract

This paper quantifies the influence of Al2O3 nanoparticles on the pool boiling performance of R134a/polyolester mixtures on a Turbo-BII-HP boiling surface. An Al2O3 nanolubricant (a lubricant containing dispersed nano-size particles) was made by suspending nominally 10 nm diameter Al2O3 particles in a synthetic polyolester to roughly a 1.6 % volume fraction. The nanoparticles caused, on average, a 12 % degradation in the boiling heat transfer relative to that for R134a/polyolester mixtures without nanoparticles for the three lubricant mass fractions that were tested. The degradation was nearly constant for heat fluxes between 20 kW/m2 and 120 kW/m2. It was speculated that the boiling heat transfer degradation was primarily due to (1) a combination of film boiling in the reentrant cavity rendering the nucleate boiling enhancement mechanism of the nanoparticles ineffective and (2) a reduction in bubble frequency due to the increased surface wetting as caused by the nanoparticles.
Citation
International Journal of Transport Phenomena

Keywords

additives, aluminum oxide, boiling, enhanced heat transfer, nanolubricant, nanotechnology, refrigerants, refrigerant/lubricant mixtures, structured surface

Citation

Kedzierski, M. (2011), Effect of Al2O3 Nanolubricant on a Passively Enhanced R134a Pool Boiling Surface, International Journal of Transport Phenomena, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=907104 (Accessed June 10, 2023)
Created November 15, 2011, Updated February 19, 2017