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Journal of Porous Media
Impact-faktor: 1.49 5-jähriger Impact-Faktor: 1.159 SJR: 0.43 SNIP: 0.671 CiteScore™: 1.58

ISSN Druckformat: 1091-028X
ISSN Online: 1934-0508

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Journal of Porous Media

DOI: 10.1615/JPorMedia.v17.i11.20
pages 953-967

HYDROMAGNETIC FLOW OF A NANOFLUID IN A POROUS CHANNEL WITH EXPANDING OR CONTRACTING WALLS

Suripeddi Srinivas
Department of Mathematics, School of Sciences and Languages, VIT-AP University, Amaravati - 522 237, India
A. Vijayalakshmi
Department of Mathematics, School of Advanced Sciences, VIT-University, Vellore-632014, India
T. R. Ramamohan
CSIR Fourth Paradigm Institute (Formerly, CSIR Center for Mathematical Modeling and Computer Simulation), Wind Tunnel Road, Bangalore-560 037, India
A. Subramanyam Reddy
Department of Mathematics, School of Advanced Sciences, VIT University, Vellore 632014, India

ABSTRAKT

The present study investigates the hydromagnetic flow of a nanofluid in a two-dimensional porous channels between slowly expanding or contracting walls. Assuming symmetric injection (or suction) along the uniformly expanding porous walls and using a similarity transformation, the governing flow equations are reduced to nonlinear ordinary differential equations. The resulting equations are then solved analytically by using the homotopy analysis method (HAM). The convergence of the obtained series solutions is analyzed through the minimization of the averaged square residual error. A comparison between analytical and numerical solutions is presented for the validation in both graphical and tabular forms. The results obtained by HAM are in very good agreement with numerical solutions obtained by the shooting method coupled with a Runge-Kutta scheme. The effects of various physical parameters such as wall expansion ratio, Brownian motion parameter, thermophoresis parameter, and Lewis number on flow variables are discussed. Analysis shows that for the case of contracting walls, the temperature increases for a given increase in Brownian motion parameter, and the thermophoresis parameter. In addition, the nanoparticle concentration increases with an increase in Brownian motion parameter and Lewis number.