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EXPERIMENTAL AND NUMERICAL STUDY OF CHAOTIC MIXING IN A CURVED-SQUARE DUCT FLOW

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Chaotic mixing in a curved-square duct flow is studied experimentally and numerically. Two walls of the
channel (inner and top walls) rotate around the center of curvature and a pressure gradient is imposed
in the direction of the exit of the channel. There are two parameters dominating the flow, the Dean number
De (proportional to the pressure gradient and the Reynolds number) and the Taylor number Tr (proportional
to the angular velocity of the wall rotation). It is found that good mixing occurs for very low Dean numbers
(low Reynolds numbers) if De equals or is less than 0.1 |Tr| because Lagrangian chaos occurs for that case.
The flow is studied both experimentally and numerically which agree with each other very well. The mechanism
of chaotic mixing is investigated by observing the entanglement process of streamlines.

Author(s):

[CANCELLED]    

Yasutaka Hayamizu    
Department of Mechanical Engineering, Yonago National College of Technology
Japan

Shinichiro Yanase    
Department of Mechanical and System Engineering, Okayama University
Japan

Kazunori Nishida    
Department of Mechanical and System Engineering, Okayama University
Japan

Kyoji Yamamoto    
Department of Mechanical and System Engineering, Okayama University
Japan