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Lookup NU author(s): Dr Mohammed Abdul Hannan
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A numerical study is performed to demonstrate the influence of wavy vortex in reducing the wall shear stress for Taylor Couette flow (viscous flow in the annuals gap between two concentrated cylinders). The study replicates an experimental investigation performed for Taylor Couette flow with radius ration of 0.892. LES of WALE model is used to solve the 3D Navier-Stokes equation in OpenFOAM. Simulation was carried out for a range of Reynold’s Number (Re); and normalized torque, wall shear and velocity are compared for various flow structure. As the Re increases from 154 to 482, the flow structure in the annular gap changes from axisymmetric Taylor vortex flow to wavy vortex flow and finally modulated wavy vortex flow. It is found that the azimuthal wall shear near the mid region drops significantly due to the appearance of wavy vortex flow, and a reduction of nearly 40 percent in normalized wall shear at inner wall is observed at the mid region for Re 170. This finding may play a significant role in the study of drag reduction and can be practically applied in various fluid structure interaction systems involving rotational parts to improve frictional efficiency.
Author(s): Razzak A, Akter A, Hannan MA
Publication type: Conference Proceedings (inc. Abstract)
Publication status: Published
Conference Name: 5th International Conference on Mechanical Engineering Research (ICMER 2019)
Year of Conference: 2019
Acceptance date: 05/06/2019