Double stratification effects on heat and mass transfer in unsteady MHD nanofluid flow over a flat surface
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Date
2017
Authors
Mutuku, Winifred Nduku
Oluwole, Daniel Makinde
Journal Title
Journal ISSN
Volume Title
Publisher
SpringerOpen
Abstract
The focus of this work is to theoretically investigate the problem of double stratification
on heat and mass transfer in an unsteady hydromagnetic boundary layer flow of a
nanofluid over a flat surface. The model employed for the nanofluid transport equations
incorporate the effects of Brownian motion and thermophoresis in the presence
of thermal and solutal stratification. The governing nonlinear partial differential equations
and their associated boundary conditions are initially transformed into dimensionless
form by using similarity variables, before being solved numerically by employing
the Runge–Kutta–Fehlberg fourth-order method with shooting technique. The
effects of different controlling parameters, viz. solutal and thermal stratification, Lewis
number, thermophoresis, Brownian motion, magnetic field and unsteadiness on the
fluid velocity, temperature, skin friction coefficient, the local Nusselt number, and the
local Sherwood number are graphically depicted and quantitatively discussed in detail
taking into account the practical applications of each profile. It is noted that thermal
stratification reduces the fluid temperature, while the solutal stratification reduces the
nanoparticle concentration.
Description
Research Article
Keywords
Heat transfer, Mass transfer, Unsteady, MHD, Nanofluid, Double stratification
Citation
Asia Pac. J. Comput. Engin. (2017) 4:2 DOI 10.1186/s40540-017-0021-2