TY - JOUR
T1 - Buoyancy-induced two-dimensional vertical flows in a thermally stratified environment
AU - Jaluria, Y.
AU - Himasekhar, K.
N1 - Funding Information:
Acknowledgements--The authors acknowledge the support provided by the Council of Scientific and Industrial Research, India, and by the Department of Mechanical and Aerospace Engineering, Rutgers University, New Brunswick, New Jersey, for this work.
PY - 1983
Y1 - 1983
N2 - A numerical study of the vertical two-dimensional natural convection flow over a heated vertical surface and that in a thermal plume, the ambient medium being stably stratified due to a temperature increase with height, is carried out. Employing finite difference techniques, these buoyancy-induced flows are studied at various stratification levels, ambient temperature distributions and at two Prandtl numbers, 6.7 and 0.7, which apply for water and air at normal temperatures. The temperature and velocity fields are determined and the downstream variation of the centerline velocity and temperature for the plume are studied. The effect of thermal stratification on the flow and heat transfer mechanisms is determined. For the plume flow, it is found that buoyancy level decreases downstream, leading to a finite height to which the flow rises in a stratified environment. For the flow adjacent to a vertical plate too, the velocity and the buoyancy levels are found to be lowered due to stratification. The numerical scheme is outlined and its accuracy and convergence discussed. The results are found to be in good agreement with earlier studies of natural convection flows in thermally stratified media.
AB - A numerical study of the vertical two-dimensional natural convection flow over a heated vertical surface and that in a thermal plume, the ambient medium being stably stratified due to a temperature increase with height, is carried out. Employing finite difference techniques, these buoyancy-induced flows are studied at various stratification levels, ambient temperature distributions and at two Prandtl numbers, 6.7 and 0.7, which apply for water and air at normal temperatures. The temperature and velocity fields are determined and the downstream variation of the centerline velocity and temperature for the plume are studied. The effect of thermal stratification on the flow and heat transfer mechanisms is determined. For the plume flow, it is found that buoyancy level decreases downstream, leading to a finite height to which the flow rises in a stratified environment. For the flow adjacent to a vertical plate too, the velocity and the buoyancy levels are found to be lowered due to stratification. The numerical scheme is outlined and its accuracy and convergence discussed. The results are found to be in good agreement with earlier studies of natural convection flows in thermally stratified media.
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U2 - 10.1016/0045-7930(83)90012-9
DO - 10.1016/0045-7930(83)90012-9
M3 - Article
AN - SCOPUS:0020543229
SN - 0045-7930
VL - 11
SP - 39
EP - 49
JO - Computers and Fluids
JF - Computers and Fluids
IS - 1
ER -