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国际计算热科学期刊
ESCI SJR: 0.249 SNIP: 0.434 CiteScore™: 1.4

ISSN 打印: 1940-2503
ISSN 在线: 1940-2554

国际计算热科学期刊

DOI: 10.1615/ComputThermalScien.2020026395
pages 417-428

HEAT AND FLUID FLOW IN REVOLVING FLUID-PARTICLE SUSPENSIONS WITH SUCTION

Muhammad Rahman
Department of Mathematics,Mirpur University of Science and Technology,Mirpur, AJ&K (10250), Pakistan; Department of Energy and Process Engineering, Norwegian University of Science and Technology, Trondheim, Norway
Helge I. Andersson
Department of Energy and Process Engineering, Norwegian University of Science and Technology, Trondheim, Norway

ABSTRACT

Heat transfer in the three-dimensional revolving flow of a particle-fluid suspension above a plane surface has been considered. The flow represents an extension of the classical Bödewadt flow to a two-fluid problem. The governing equations for the two phases are coupled through an interaction force with the particle relaxation time τ as a free parameter. By means of a similarity transformation, the coupled set of nonlinear ordinary differential equations (ODEs) becomes a two-point boundary value problem. The numerical results showed that the radial inward particle velocity increased, whereas the circumferential velocity decreased by shortening τ, thereby strengthening the spiraling particle motion. These predictions are consistent with the so-called teacup effect, i.e., accumulation of tea leaves at the center of the cup. On the contrary, the revolving fluid motion was reduced as a result of the particle-fluid interactions. The modulation of the fluid velocity caused by the particle phase has only negligible influence on the temperature field, and the heat transfer rate through the planar surface was unaffected for Prandtl numbers in the range from 0.5 to 7.0.

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