Simultaneous effect of rotation and natural convection on the flow about a liquid sphere |
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Authors: | Mohamed A Antar Maged A I El-Shaarawi |
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Institution: | (1) Mechanical Engineering Department, King Fahd University of Petroleum and Minerals KFUPM, Dhahran 31261, Saudi Arabia, |
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Abstract: | The problem of mixed convection around a liquid sphere that experiences a rotation about its axis parallel to the free stream is studied numerically using a finite- difference technique. The coupled boundary-layer energy and momentum equations are numerically solved over a wide range of Grashof number that represents the cases of aiding and opposing free convection and for wide range of the spin parameter Ta/Re2. The surface of the sphere also rotates as a result of the shear stress exerted from the external flow of air. The effect of both parameters on the velocity components as well as the temperature within the thermal boundary-layer is presented. Results show that increasing the aiding free convection and the spin parameter cause increases in the shear stress and the local heat transfer coefficient. |
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