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Effect of Al2O3 Nanolubricant on a Passively Enhanced R134a Pool Boiling Surface with Extensive Measurement and Analysis Details (NIST TN 1677)

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. Nanofluids are liquids that contain dispersed nano-size particles. A lubricant based nanofluid (nanolubricant) was made by suspending nominally, 10 nm diameter Al2O3 particles in a synthetic ester 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 a combination of film boiling in the reentrant cavity rendering the nucleate boiling enhancement mechanism of the nanoparticles ineffective and a reduction in bubble frequency due to the increased surface wetting as caused by the nanoparticles.
Citation
Technical Note (NIST TN) - 1677
Report Number
1677

Keywords

additives, boiling, Al2O3, enhanced heat transfer, nanotechnology, refrigerants, refrigerant/lubricant mixtures, structured surface

Citation

Kedzierski, M. (2010), Effect of Al<sub>2</sub>O<sub>3</sub> Nanolubricant on a Passively Enhanced R134a Pool Boiling Surface with Extensive Measurement and Analysis Details (NIST TN 1677), Technical Note (NIST TN), National Institute of Standards and Technology, Gaithersburg, MD, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=906724 (Accessed March 2, 2024)
Created September 29, 2010, Updated February 19, 2017