Quenching experiments of a high temperature sphere in Al2O3 nanofluids are conducted to investigate the characteristics of film boiling and compared to those in pure water tests. One stainless steel sphere of 10 mm in diameter at the initial temperatures of 1000∼1400 K was tested in the nanofluids of the volume concentrations from 5 to 20% and the degrees of subcooling from 20 to 80 K. The test results show that film boiling heat fluxes and heat transfer rates in nanofluids were lower than those in pure water. The differences of the film boiling heat transfer rates between pure water and nanofluids become larger when the liquid subcooling decreases. Those results suggest that the presence of nanoparticles in liquid enhances vaporization process during the film boiling. The effects of nanoparticle concentrations of more than 5 vol. % on film boiling appear to be insignificant. However, the minimum heat fluxes tend to decrease when the concentration increases. Direct quenching without film boiling was repeatedly observed when an unwashed sphere was employed for quenching tests in nanofluids. It suggests that nanoparticle deposition on the sphere surface prevents the sphere from forming film around the sphere, which consequently promotes the rapid quenching of the hot sphere.
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ASME 2004 Heat Transfer/Fluids Engineering Summer Conference
July 11–15, 2004
Charlotte, North Carolina, USA
Conference Sponsors:
- Heat Transfer Division and Fluids Engineering Division
ISBN:
0-7918-4693-8
PROCEEDINGS PAPER
Film Boiling Heat Transfer on a High Temperature Sphere in Nanofluid Available to Purchase
Hyun Sun Park,
Hyun Sun Park
Royal Institute of Technology, Stockholm, Sweden
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Dereje Shiferaw,
Dereje Shiferaw
Royal Institute of Technology, Stockholm, Sweden
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Bal Raj Sehgal,
Bal Raj Sehgal
Royal Institute of Technology, Stockholm, Sweden
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Do Kyung Kim,
Do Kyung Kim
Royal Institute of Technology, Stockholm, Sweden
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Mamoun Muhammed
Mamoun Muhammed
Royal Institute of Technology, Stockholm, Sweden
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Hyun Sun Park
Royal Institute of Technology, Stockholm, Sweden
Dereje Shiferaw
Royal Institute of Technology, Stockholm, Sweden
Bal Raj Sehgal
Royal Institute of Technology, Stockholm, Sweden
Do Kyung Kim
Royal Institute of Technology, Stockholm, Sweden
Mamoun Muhammed
Royal Institute of Technology, Stockholm, Sweden
Paper No:
HT-FED2004-56471, pp. 469-476; 8 pages
Published Online:
February 24, 2009
Citation
Park, HS, Shiferaw, D, Sehgal, BR, Kim, DK, & Muhammed, M. "Film Boiling Heat Transfer on a High Temperature Sphere in Nanofluid." Proceedings of the ASME 2004 Heat Transfer/Fluids Engineering Summer Conference. Volume 4. Charlotte, North Carolina, USA. July 11–15, 2004. pp. 469-476. ASME. https://doi.org/10.1115/HT-FED2004-56471
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