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International Journal of Rotating Machinery
Volume 2005, Issue 3, Pages 197-201

Thermal Fluid Flow Transport Phenomenon in Unsteady Rotating Drum during Spin-Down Process

1Department of Mechanical Engineering and Materials Science, Kumamoto University, Kumamoto 860-8555, Japan
2Mechanical Engineering and College of Engineering, The University of Michigan, Ann Arbor 48109, MI, USA

Received 10 March 2005

Copyright © 2005 Shuichi Torii and Wen-Jei Yang. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Numerical analysis is performed on unsteady-state thermal fluid flow transport phenomena in a rotating drum heated at constant wall temperature during a spin-down process. Emphasis is placed on the effect of aspect ratio of the drum on the velocity and temperature fields. The governing equations are discretized by means of a finite-difference technique and numerically solved to determine the distributions of velocity vector and fluid temperature in the drum. It is disclosed from the study that (i) the formation of Ekman boundary layers on both sidewalls of the drum results in a pair of recirculating flows, and (ii) an attenuation of the flow velocity is affected by the aspect ratio of a drum. Results may be used to develop a method to achieve uniform mixing in an enclosed vessel.