EFFECTS OF THERMAL BOUNDARY CONDITION ON BUOYANCY DRIVEN TRANSITIONAL AIR FLOW IN A VERTICAL CYLINDER HEATED FROM BELOW

2000 ◽  
Vol 37 (8) ◽  
pp. 917-936 ◽  
Author(s):  
T. C. Cheng, Y. H. Li, T. F. Lin
Keyword(s):  
Boundary Condition ◽  
Air Flow ◽  
Vertical Cylinder ◽  
Thermal Boundary Condition

An Experimental Investigation of the Natural Convection of a Heat Generating Fluid within a Closed Vertical Cylinder

1970 ◽  
Vol 12 (5) ◽  
pp. 354-363 ◽  
Author(s):  
W. Murgatroyd ◽  
A. Watson
Keyword(s):  
Experimental Data ◽  
Boundary Condition ◽  
Experimental Investigation ◽  
Natural Convection ◽  
Theoretical Model ◽  
Vertical Cylinder ◽  
Thermal Boundary Condition ◽  
Cylinder Wall ◽  
Uniform Temperature ◽  
Temperature Distributions

Experimental results are presented of the velocity and temperature distributions within a heat-generating fluid contained in a vertical closed cylinder, for the case in which the outer surface of the cylinder wall is maintained at a uniform temperature. Previous experimental data are compared and an earlier theoretical model for a different thermal boundary condition is reinterpreted for the present case.

scholarly journals Darcy-Brinkman free convection about a wedge and a cone subjected to a mixed thermal boundary condition

1992 ◽  
Vol 15 (4) ◽  
pp. 789-794 ◽  
Author(s):  
G. Ramanaiah ◽  
V. Kumaran
Keyword(s):  
Heat Transfer ◽  
Boundary Condition ◽  
Heat Flux ◽  
Porous Medium ◽  
Heat Transfer Coefficient ◽  
Free Convection ◽  
Transformation Group ◽  
Darcy Number ◽  
Thermal Boundary Condition ◽  
High Porosity

The Darcy-Brinkman free convection near a wedge and a cone in a porous medium with high porosity has been considered. The surfaces are subjected to a mixed thermal boundary condition characterized by a parameterm;m=0,1,∞correspond to the cases of prescribed temperature, prescribed heat flux and prescribed heat transfer coefficient respectively. It is shown that the solutions for differentmare dependent and a transformation group has been found, through which one can get solution for anymprovided solution for a particular value ofmis known. The effects of Darcy number on skin friction and rate of heat transfer are analyzed.

An Investigation of Local Heat Transfer during Grinding Process—Effects of Porosity of Grinding Wheel

1979 ◽  
Vol 101 (2) ◽  
pp. 97-103 ◽  
Author(s):  
Y. Saito ◽  
N. Nishiwaki ◽  
Y. Ito
Keyword(s):  
Heat Transfer ◽  
Boundary Condition ◽  
Heat Transfer Coefficient ◽  
Transfer Coefficient ◽  
Local Heat Transfer ◽  
Local Heat ◽  
Thermal Boundary Condition ◽  
Grinding Wheel ◽  
Grinding Process ◽  
Workpiece Surface

The thermal boundary condition around the workpiece surface is one of important factors to analyze the thermal deformation of a workpiece, which is in close relation to the machining, accuracy of grinding. The heat dissipation from the workpiece surface which is influenced by the flow pattern, may govern this thermal boundary condition. In consequence, it is necessary to clarify the convection heat transfer coefficient and the flow pattern of air and/or grinding fluid around surroundings of a rotating grinding wheel and of a workpiece. Here experiments were carried out in a surface grinding process to measure the flow velocity, wall pressure and local heat transfer by changing the porosity of the grinding wheel. The air blowing out from the grinding wheel which is effected by the porosity may be considered to have large influences on the local heat transfer coefficient, which is found to be neither symmetric nor uniform over the workpiece surface.

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