The dissipation of heat by free convection. horizontal and vertical cylinders; spheres

Physica ◽  
1942 ◽  
Vol 9 (7) ◽  
pp. 665-672 ◽  
Author(s):  
W. Elenbaas
Keyword(s):  
Free Convection ◽  
Vertical Cylinders

Effect of Surface Radiation on Free Convection in Vertical Cylinders Partially Annular

2018 ◽  
Vol 389 ◽  
pp. 36-49
Author(s):  
Belkacem Ould Said ◽  
Mohamed Amine Medebber ◽  
Nourddine Retiel
Keyword(s):  
Heat Transfer ◽  
Free Convection ◽  
Radiation Heat Transfer ◽  
Surface Radiation ◽  
Navier Stokes ◽  
Discrete Ordinates ◽  
Energy Equations ◽  
Vertical Cylinders ◽  
Rayleigh Numbers ◽  
Emissivity Coefficient

The coupled of free convection with surface radiation in an annular region of two concentric vertical cylinders filled with air has been numerically investigated. The steady-state continuity, Navier–Stokes and energy equations were carried out by the finite volume method, and the Discrete Ordinates Method (DOM) was used to solve the radiative heat transfer equation (RTE). The computations have been performed for 103 ≤Ra≤ 106, with the emissivity coefficient of all the walls varying between 0 and 1. The influence of the both, Rayleigh numbers and emissivity coefficient of the wall for fixed height ratio X=0.5 on natural convection and radiation heat transfer in enclosure have been solved. The result shows that surface radiation significantly altered the temperature distribution and the flow patterns, especially at higher Rayleigh numbers. The average Nusselt number has also been discussed for different emissivity through the enclosure.

Free convection heat transfer from vertical cylinders and wires

1969 ◽  
Vol 24 (9) ◽  
pp. 1491-1495 ◽  
Author(s):  
H.R. Nagendra ◽  
M.A. Tirunarayanan ◽  
A. Ramachandran
Keyword(s):  
Heat Transfer ◽  
Free Convection ◽  
Convection Heat Transfer ◽  
Convection Heat ◽  
Free Convection Heat ◽  
Vertical Cylinders

Frost Formation on Vertical Cylinders in Free Convection

1982 ◽  
Vol 104 (1) ◽  
pp. 3-7 ◽  
Author(s):  
C. J. Cremers ◽  
V. K. Mehra
Keyword(s):  
Heat Transfer ◽  
Free Convection ◽  
Growth Rates ◽  
Convective Flow ◽  
Vertical Cylinder ◽  
Free Convective Flow ◽  
Frost Formation ◽  
Vertical Cylinders ◽  
Frost Growth

Frost growth on a cooled vertical cylinder in free convective flow was studied experimentally. A correlation that is based on heat transfer considerations was found to be effective in predicting frost growth rates particularly at relative humidities equal to or greater than 65 percent and growing times equal to or greater than 60 min.

Combined Convective Heat Transfer from Vertical Cylinders in a Horizontal Air-Stream

1978 ◽  
Vol 5 (2) ◽  
pp. 115-117
Author(s):  
P. H. Oosthuizen ◽  
R. Leung
Keyword(s):  
Heat Transfer ◽  
Free Convection ◽  
Convective Heat Transfer ◽  
Heat Transfer Rate ◽  
Convective Heat ◽  
Transfer Rate ◽  
Circular Cylinders ◽  
Transfer Rates ◽  
Air Stream ◽  
Vertical Cylinders

Mean heat transfer rates from a series of circular cylinders mounted vertically in a horizontal air-stream have been measured. Five cylinders were used, having diameters of approximately 19 to 25 mm and heights of approximately 150 to 300 mm. Heat transfer rates from these cylinders were measured at a number of different air velocities ranging from zero to about 1.6 m/s. The results indicate that the heat transfer rate in the combined convection range is higher than it would be under the same conditions with purely free convection or purely forced convection. An attempt has been made to correlate the combined convective heat transfer rates in terms of the heat transfer rates that would exist under the same conditions in these two limiting cases of purely forced and purely free convection.

Temperature Measurement in Laminar Free Convection Using Electro-Optic Holography

1997 ◽  
Vol 7 (9) ◽  
pp. 1893-1898 ◽  
Author(s):  
G. Schirripa Spagnolo ◽  
D. Ambrosini ◽  
A. Ponticiello ◽  
D. Paoletti
Keyword(s):  
Free Convection ◽  
Temperature Measurement ◽  
Electro Optic
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