| Author(s): |
Mark A. Kedzierski; |
| Title: |
Effect of Al2O3 Nanolubricant on a Passively Enhanced R134a Pool Boiling Surface with Extensive Measurement and Analysis Details (NIST TN 1677) |
| Published: |
September 29, 2010 |
| 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: |
NIST TN - 1677 |
| Pages: |
42 pp. |
| Keywords: |
additives, boiling, Al2O3, enhanced heat transfer, nanotechnology, refrigerants, refrigerant/lubricant mixtures, structured surface |
| Research Areas: |
Energy Efficiency, Building Energy Conservation, Building Equipment Efficiency |
| PDF version: |
 Click here to retrieve PDF version of paper (502KB) |
