Film boiling heat transfer around a very high temperature thin wire immersed into water at pressure from 1 to 210bar: Experimental results and analysis

The analysis of Rivers and McFadden for film boiling heat transfer from horizontal cylinders immersed in Helium II is briefly reviewed and results are recapitulated. Experimental measurements of film boiling heat transfer are made for horizontal cylinders of 0.145 cm and 0.245 cm dia immersed in Helium II baths at 1.78, 1.96, and 2.1 K at wall heat fluxes up to 2.84 w/cm2. The nondimensionalized experimental results are compared with the accepted correlations of Bromley and Breen and West-water to demonstrate the inability of the usual film boiling correlations to predict film boiling in Helium II. The nondimensionalized experimental results are compared with the predictions of the Rivers and McFadden analysis which considers Helium II properties, and the results of the analysis are substantiated.

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Study of Convection Heat Transfer in a Very High Temperature Reactor Flow Channel: Numerical and Experimental Results

Nuclear Technology ◽

10.13182/nt16-46 ◽

2016 ◽

Vol 196 (3) ◽

pp. 661-673 ◽

Cited By ~ 5

Author(s):

Francisco I. Valentín ◽

Narbeh Artoun ◽

Ryan Anderson ◽

Masahiro Kawaji ◽

Donald M. McEligot

Keyword(s):

Heat Transfer ◽

High Temperature ◽

Convection Heat Transfer ◽

Flow Channel ◽

Experimental Results ◽

Convection Heat ◽

Very High Temperature Reactor ◽

High Temperature Reactor ◽

Very High

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Film Boiling Heat Transfer on a High Temperature Sphere in Nanofluid

Volume 4 ◽

10.1115/ht-fed2004-56471 ◽

2004 ◽

Cited By ~ 17

Author(s):

Hyun Sun Park ◽

Dereje Shiferaw ◽

Bal Raj Sehgal ◽

Do Kyung Kim ◽

Mamoun Muhammed

Keyword(s):

Heat Transfer ◽

High Temperature ◽

Boiling Heat Transfer ◽

Pure Water ◽

Rapid Quenching ◽

Heat Fluxes ◽

Film Boiling ◽

Nanoparticle Deposition ◽

Steel Sphere ◽

Transfer Rates

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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