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Unsteady natural convection in micropolar nanofluids

100%
Rup K., Nering K.
Archives of Thermodynamics
|
2014
|
issue 3
2
Content available remote

Numerical simulation of 2D granular particles and its analyses by means of the micropolar fluid model

100%
Takechi K., Yoshida K., Arimitsu T.
Open Physics
|
2012
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vol. 10
|
issue 3
684-691
EN
Numerical simulations of two-dimensional granular flows under uniform mean shear and external body torque were performed following the setting of the authors’ previous study [10]. Convergence of the stresses with the increase of coarse-graining length is investigated. Difference R between vorticity field and spin field is controlled by the external torque and the stresses for the region R > 0 is obtained as well as those for R < 0. The symmetry of the stresses under the change of the sign of R is discussed.
3
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The flow of a micropolar fluid through a porous channel with expanding or contracting walls

88%
Si X., Zheng L., Zhang X., Chao Y.
Open Physics
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2011
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vol. 9
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issue 3
825-834
EN
The flow of a micropolar fluid in a porous channel with expanding or contracting walls is investigated. The governing equations are reduced to ordinary ones by using similar transformations. Homotopy analysis method (HAM) is employed to obtain the expressions for the velocity fields and microrotation fields. Graphs are sketched for the effects of some values of parameters, especially the expansion ratio, on the velocity and microrotation fields and associated dynamic characteristics are analyzed in detail.
4
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Perturbation technique for unsteady MHD mixed convection periodic flow, heat and mass transfer in micropolar fluid with chemical reaction in the presence of thermal radiation

88%
Pal D., Talukdar B.
Open Physics
|
2012
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vol. 10
|
issue 5
1150-1167
EN
An analytical study is presented for the problem of unsteady hydromagnetic heat and mass transfer for a micropolar fluid bounded by semi-infinite vertical permeable plate in the presence of first-order chemical reaction, thermal radiation and heat absorption. A uniform magnetic field acts perpendicularly to the porous surface which absorbs the micropolar fluid with a time-dependent suction velocity. The basic partial differential equations are reduced to a system of nonlinear ordinary differential equations which are solved analytically using perturbation technique. Numerical calculations for the analytical expressions are carried out and the results are shown graphically. The effects of the various dimensionless parameters related to the problem on the velocity, angular velocity, temperature and concentration fields are discussed in detail.
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