THERMAL SCIENCE

International Scientific Journal

Aleksandar Z. Boričić

,

Miloš M. Jovanović

,

Branko Z. Boričić

MHD EFFECTS ON UNSTEDY DYNAMIC, THERMAL AND DIFFUSION BOUNDARY LAYER FLOW OVER A HORIZONTAL CIRCULAR CYLINDER

ABSTRACT
This paper is devoted to the analysis of unsteady two-dimensional dynamic, thermal and diffusion magnetohydrodynamic laminar boundary layer flow over a horizontal circular cylinder of incompressible and electrical conductivity fluid, in a porous medium, in the presence of a heat source or sink, and chemical reactions. The present magnetic field is homogenous and perpendicular to the body surface. It is assumed that the induction of the outer magnetic field is the function of the longitudinal coordinate and time. Fluid electrical conductivity is constant. The outer electric field is neglected and the magnetic Reynolds number is significantly lower than one i. e. the considered the problem is in induction-less approximation. Free stream velocity, temperature and concentration on the body are arbitrary differentiable functions. The developed governing boundary layer equations and associated boundary conditions are converted into a nondimensional form using a suitable similarity transformation and similarity parameters. The system of dimensionless equations is solved using the finite difference method and iteration method. Numerical results are obtained and presented for incompressible fluid for different numbers, such as Sc, Pr, Ec and magnetic number, and the parameter of the porous medium, temperature parameters, thermal parameter, diffusion parameters and chemical reaction parameter. The solutions for the flow, temperature and diffusion transfer and other integral characteristics, boundary layer, are evaluated numerically for different values of the magnetic field. Transient effects of velocity, temperature and diffusion are analyzed. A part of obtained results is given in the form of figures and corresponding conclusions.
KEYWORDS
MHD boundary layer, mass and heat transfer, porous medium, heat source or sink, circular cylinder
PAPER SUBMITTED: 2012-05-03
PAPER REVISED: 2012-06-25
PAPER ACCEPTED: 2012-07-05
DOI REFERENCE: https://doi.org/10.2298/TSCI120503171B
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2012, VOLUME 16, ISSUE Supplement 2, PAGES [S311 - S321]
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MHD effects on unstedy dynamic, thermal and diffusion boundary layer flow over a horizontal circular cylinder

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