Dynamical responses of non-isothermal flow between two independently rotating disks with time-dependent wall conditions |
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Authors: | C Y Soong T P Liu C C Wu |
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Institution: | (1) Professor, Department of Aeronautical Engineering, Feng Chia University, Seatwen, Taichung, Taiwan 40745, ROC,;(2) PhD candidate, Graduate School of Defense Science Studies, Chung Cheng Institute of Technology, Tahsi, Taoyuan, Taiwan 33509, ROC,;(3) Associate Professor, Department of Industrial Engineering and Management, Chien Kuo Institute of Technology, Changhua, Taiwan 500, ROC, |
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Abstract: | The present work develops a theoretical model of rotational convection and uses it to investigate the dynamical responses
of the flow and heat transfer between two disks rotating at different rates under the influences of time-dependent disturbances.
The unsteady non-isothermal flow model is formulated by extending a recently developed steady-state similarity model of axi-symmetric
rotational convection. In the new model all the rotation-induced buoyancy forces are considered. Using one disk as reference,
effects of the time-dependent changes in wall temperature or rotating rate of the other disk on the flow and heat transfer
are explored. Various rotational modes with asymptotic or fluctuating change in boundary condition of temperature or disk
rotation are studied. The present time-dependent model for this non-isothermal rotating flow is numerically solved by a finite-difference
method. By using the present results, the complicated flow and heat transfer mechanisms with thermal-flow coupling in the
class of time-dependent rotational convection are manifested. |
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Keywords: | |
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