Journal
EUROPEAN PHYSICAL JOURNAL PLUS
Volume 131, Issue 5, Pages -Publisher
SPRINGER HEIDELBERG
DOI: 10.1140/epjp/i2016-16175-6
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In this paper, the unsteady Stokes flow of an incompressible couple stress fluid around a rotating sphere is investigated. The non-classical slip condition is applied on the spherical boundary. In addition, the couple stresses on the boundary are assumed to vanish. The analytical solution of the problem is obtained using the technique of Laplace transform. The torque experienced by the fluid on the sphere is evaluated and the inversion of the Laplace transform is implemented numerically. The results showed that the torque acting on the sphere increases monotonically with the slip parameter at a fixed time. They also showed that the presence of couple stresses increases the torque.
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