scholarly journals Discussion: “Free Convective Heat Transfer to Supercritical Water Experimental Measurements” (Fritsch, C. A., and Grosh, R. J., 1963, ASME J. Heat Transfer, 85, pp. 289–293)

1963 ◽  
Vol 85 (4) ◽  
pp. 293-293
Author(s):  
Kurt Goldmann
Keyword(s):  
Heat Transfer ◽  
Convective Heat Transfer ◽  
Convective Heat ◽  
Supercritical Water ◽  
Experimental Measurements ◽  
Free Convective Heat Transfer

Free Convective Heat Transfer Across Inclined Air Layers

1976 ◽  
Vol 98 (2) ◽  
pp. 189-193 ◽  
Author(s):  
K. G. T. Hollands ◽  
T. E. Unny ◽  
G. D. Raithby ◽  
L. Konicek
Keyword(s):  
Heat Transfer ◽  
Nusselt Number ◽  
Convective Heat Transfer ◽  
Convective Heat ◽  
Horizontal Layer ◽  
Experimental Measurements ◽  
Number Range ◽  
Transfer Rates ◽  
Air Layers ◽  
Free Convective Heat Transfer

This paper presents new experimental measurements on free convective heat transfer rates through inclined air layers of high aspect ratio, heated from below. The Rayleigh number range covered is from subcritical to 105; the range of the angle of inclination, φ measured from the horizontal is: 0 < φ < ∼70 deg. Although it was anticipated that the results might be identical to the results for the horizontal layer if one replaced Ra by Ra cos φ, significant departures from this behavior were observed, particularly in the range 1708 < Ra cos φ < 104, 30 deg ≤ φ < 60 deg. A recommended relationship giving the Nusselt number as a function of Ra cos φ and φ is reported. This relationship fits all data closely.

Free Convective Heat Transfer to Supercritical Water Experimental Measurements

1963 ◽  
Vol 85 (4) ◽  
pp. 289-293 ◽  
Author(s):  
C. A. Fritsch ◽  
R. J. Grosh
Keyword(s):  
Heat Transfer ◽  
Critical Point ◽  
Convective Heat Transfer ◽  
Convective Heat ◽  
Supercritical Water ◽  
Convection Heat Transfer ◽  
Analytical Investigation ◽  
Viscosity Data ◽  
State Equations ◽  
Free Convective Heat Transfer

Laminar free convective heat transfer from a vertical flat plate has been studied for water close to its critical point where there are marked variations in density and specific heat. All of the trends indicated in the authors’ previous analytical investigation were verified by the experimental data. There was a systematic deviation of about 20 percent—the analytical results being consistently lower than the experimental observations. However, this could easily be due to the lack of precise thermal conductivity and dynamic viscosity data for the region of interest. This investigation has established that the basic conservation and state equations with variable properties may be used to adequately describe laminar free convection heat transfer in supercritical water up to a few tenths of a degree from the critical point.

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