Natural Convection Heat Transfer Between Cylindrical Tube Bundles and a Cubical Enclosure

1981 ◽  
Vol 103 (1) ◽  
pp. 103-107 ◽  
Author(s):  
R. O. Warrington ◽  
Gordon Crupper
Keyword(s):  
Heat Transfer ◽  
Natural Convection ◽  
Convection Heat Transfer ◽  
Cylindrical Tube ◽  
Vertical Axis ◽  
Vertical Position ◽  
Natural Convection Heat Transfer ◽  
Convection Heat ◽  
Average Deviation ◽  
Cubical Enclosure

Natural convection heat transfer from a fixed array of four isothermal, heated cylinders to an isothermal, cooled cubical enclosure was experimentally investigated for both a horizontal and vertical position of the array. Included in this study are heat transfer, flow visualization, and temperature profile results for Prandtl numbers in the range of .7 to 3.1 × 104 and Rayleigh numbers, based on gap width, in the range of 6.3 × 105 to 6.9 × 108. Several geometric effects were observed. The vertical configuration convected less heat than the horizontal while a rotation about the vertical axis for each of these configurations had negligible effect on the overall heat transfer. The heat transfer results were correlated and compared with previous enclosure results. The heat transfer correlations fit the data with an average deviation of less than 10 percent.

Natural Convection Heat Transfer Between Bodies and Their Spherical Enclosure

1983 ◽  
Vol 105 (3) ◽  
pp. 440-446 ◽  
Author(s):  
R. E. Powe ◽  
R. O. Warrington
Keyword(s):  
Heat Transfer ◽  
Natural Convection ◽  
Convective Heat Transfer ◽  
Convective Heat ◽  
Convection Heat Transfer ◽  
Natural Convection Heat Transfer ◽  
Convection Heat ◽  
Average Deviation ◽  
Eccentric Cylinders ◽  
Different Shapes

The natural convective heat transfer phenomena which occur between a body and its spherical enclosure have been experimentally investigated. Bodies of several different shapes were employed, so the results should have broad applicability. New temperature field and heat transfer results, in the form of natural convection from cubical inner bodies to a spherical enclosure, have been combined with previously available enclosure data. By considering all of the data combined, trends in the behavior of the convective heat transfer phenomena have been established, thus enabling a much more reliable analysis of enclosed body problems than is now possible. A very general heat transfer correlation has been developed which predicts the natural convection heat transfer from spheres (concentric and eccentric), cylinders, and cubes to a spherical enclosure with an average deviation of less than 12 percent. Although these results are strictly valid only for a spherical outer body, they should give a preliminary indication of expected behavior for other shapes.

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