Fully developed mixed convection flow in a vertical channel with electrokinetic effects

Purpose The purpose of this paper is to investigate electrokinetic and mixed convection (pressure gradient and buoyancy) effects on reverse flow formation at the channel walls. Design/methodology/approach The electrical potential distribution was modelled using the Poisson–Boltzmann equation while t...

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Bibliographic Details
Published in:Multidiscipline modeling in materials and structures 2018-12, Vol.14 (5), p.1031-1041
Main Authors: Jha, Basant Kumar, Oni, Michael O
Format: Article
Language:English
Subjects:
Boltzmann transport equation
Boundary conditions
Charge distribution
Computational fluid dynamics
Convection
Convection heating
Electric fields
Electrokinetic effects
Electrokinetics
Fluids
Heat transfer
Mathematical models
Parameters
Pressure effects
Skin
Skin friction
Velocity
Walls
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Summary:Purpose The purpose of this paper is to investigate electrokinetic and mixed convection (pressure gradient and buoyancy) effects on reverse flow formation at the channel walls. Design/methodology/approach The electrical potential distribution was modelled using the Poisson–Boltzmann equation while the governing momentum and energy equations are modelled from the Navier–Stokes equations and solved exactly. Findings It is found that flow reversal at the walls is enhanced by electrokinetic parameter whereas increasing degree of asymmetric parameter up to symmetric heating eliminates reverse flow formation at the walls no matter the electric charge distribution. Originality/value The results of this paper indicate that degree of asymmetric heating, mixed convection parameter and electrokinetic parameter regulate fluid velocity, rate of heat transfer, skin friction and reverse flow formation at the walls.
ISSN:1573-6105
1573-6113
DOI:10.1108/MMMS-10-2017-0123