scholarly journals Discussion: “Film Boiling Heat Transfer From an Oscillating Sphere” (Rhea, L. G., and Nevins, R. G., 1969, ASME J. Heat Transfer, 91, pp. 267–271)

1969 ◽  
Vol 91 (2) ◽  
pp. 271-272
Author(s):  
L. C. Witte ◽  
J. E. Cox
Keyword(s):  
Heat Transfer ◽  
Boiling Heat Transfer ◽  
Film Boiling ◽  
Oscillating Sphere

Film Boiling Heat Transfer From an Oscillating Sphere

1969 ◽  
Vol 91 (2) ◽  
pp. 267-271 ◽  
Author(s):  
L. G. Rhea ◽  
R. G. Nevins
Keyword(s):  
Heat Transfer ◽  
Heat Flux ◽  
Boiling Heat Transfer ◽  
Correlation Equation ◽  
Heat Transfer Surface ◽  
Film Boiling ◽  
Maximum Deviation ◽  
Coated Surface ◽  
Good Agreement ◽  
Oscillating Sphere

An experimental investigation has been undertaken to determine the effect of oscillation of the heat transfer surface on turbulent film boiling heat transfer. A transient technique was used to calculate the heat flux from copper spheres of 1 in., 3/4 in., and 1/2 in. dia. In all tests, saturated liquid nitrogen at atmospheric pressure was used as the boiling fluid. The data obtained were found to be in good agreement with published theory at zero frequency. The range of frequencies studied was from zero to approximately 12 cps at peak-to-peak amplitudes of 2 in. and 1 in., i.e., at amplitude-to-diameter ratios of 1.00, 1.34, 2.00, 2.67, and 4.00. It was determined that oscillation of the heat transfer surface considerably increases the heat flux for a given temperature difference over that for natural convection film boiling. The results were correlated with a maximum deviation of +35, −17 percent. The correlation equation Nu=0.14gd3ρvf(ρl−ρvf)μvf2(Pr)vfhfgCpvfΔT+0.5ag+X2F2gd1/3 showed that the Nusselt number was proportional to the vibrational Fronde number to the 2/3 power. Tests were conducted with spheres having a corroded surface, a glass-bead-peened surface and a Teflon-coated surface. The results show that the turbulent film boiling from an oscillating sphere is independent of the condition of the heat transfer surface over the range of frequencies and amplitudes tested.

Film boiling heat transfer around a vertical finite-length cylinder with a convex hemispherical bottom

2010 ◽  
pp. n/a-n/a
Author(s):  
Takashi Yamada ◽  
Kaoru Toyoda ◽  
Toru Shigechi ◽  
Satoru Momoki ◽  
Kuniyasu Kanemaru ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Finite Length ◽  
Boiling Heat Transfer ◽  
Film Boiling
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