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100 results on '"Opanuga, Abiodun A."'

27. Convection Flow of MHD Couple Stress Fluid in Vertical Microchannel with Entropy Generation

Author

Opanuga, Abiodun, Agboola, Olasunmbo Olaoluwa, Okagbue, Hilary, and Bishop, Shiela

Subjects
Science / Physics
Abstract

Entropy generation of fully developed steady, viscous, incompressible couple stress fluid in a vertical micro-porous-channel in the presence of horizontal magnetic field is analysed in this work. The governing equations for the flow are derived, and nondimensionalised and the resulting nonlinear ordinary differential equations are solved via a rapidly convergent technique developed by Zhou. The solution of the velocity and temperature profiles are utilised to obtain the flow irreversibility and Bejan number. The effects of couple stresses, fluid wall interaction parameter (FSIP), effective temperature ratio (ETR), rarefaction and magnetic parameter on the velocity profile, temperature profile, entropy generation and Bejan number are presented and discussed graphically.

Published
2019

36. Entropy Generation of Unsteady MHD Couette Flow through Vertical Microchannel with Hall and Ion Slip Effects.

Author

Opanuga, Abiodun A., Adesanya, Samuel O., Bishop, Sheila A., Okagbue, Hilary I., and Agboola, Olasumbo O.

Subjects
*COUETTE flow, *ORDINARY differential equations, *PARTIAL differential equations, *GRASHOF number, *DIFFERENTIAL equations, *ENTROPY (Information theory), *MAGNETOHYDRODYNAMICS, *MICROCHANNEL flow
Abstract

In this work, the entropy generation of unsteady hydromagnetic Couette flow through vertical microchannel has been considered, the effects of Hall current and Ion-slip are also examined. One of the plates moves with uniform velocity in the direction of the fluid flow while the other plate is stationary. The partial differential equations governing the flow are obtained and transformed to ordinary differential equations. The obtained solutions for the velocity and energy equations via differential transform technique are used to calculate the entropy generation and Bejan number. The results are presented through plots and discussed. It is noticed that primary velocity decreases with increase in Hall current, ionslip and magnetic field parameters whereas it increases as rarefaction parameter, wall-ambient temperature difference ratio, Brinkman number and Grashof number increase in values. Also secondary velocity receives a boost with increase in Hall current, Ion-slip, rarefaction parameters, wall-ambient temperature difference ratio, Brinkman and Grashof numbers. Furthermore, entropy generation is minimised as Hall current, Ion-slip and rarefaction parameters increase. [ABSTRACT FROM AUTHOR]

Published
2020

46. Modified Adomian Decomposition Method for Thirteenth Order Boundary Value Problems

Author

OPANUGA, Abiodun A.

Subjects
Boundary valueproblem,Adomian decomposition method,series solution
Abstract

This work considers the numerical solution of thirteenth order boundary value problems usingthe modified Adomian decomposition method (MADM). Some examples are considered toillustrate the efficiency of the method. It was demonstrated that MADM converges more rapidlyto the exact solution than the existing methods in literature and it reduces the computationalinvolvement.

Published
2016

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