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MHD mixed convective stagnation-point flow of Eyring-Powell nanofluid over stretching cylinder with thermal slip conditions

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Journal of Central South University 2019年第5期26卷 1172-1183页

作者： Hammed Abiodun OGUNSEYE Precious SIBANDA hiranmoy mondal School of Mathematics Statistics and Computer Science University of KwaZulu-Natal

The optimal design of heating and cooling systems must take into account heat radiation which is a non-linear *** this study,the mixed convection in a radiative magnetohydrodynamic Eyring-Powell copperwater nanofluid over a stretching cylinder was *** energy balance is modeled,taking into account the non-linear thermal radiation and a thermal slip *** effects of the embedded flow parameters on the fluid properties,as well as on the skin friction coefficient and heat transfer rate,are *** in many existing studies,the recent spectral quasi-linearization method is used to solve the coupled nonlinear boundary-value *** computational result shows that increasing the nanoparticle volume fraction,thermal radiation parameter and heat generation parameter enhances temperature *** found that the velocity slip parameter and the fluid material parameter enhance the skin friction.A comparison of the current numerical results with existing literature for some limiting cases shows excellent agreement.

关键词： Eyring-Powell model stretching cylinder nanofluid thermal radiation slip effects spectral quasi-linearization method

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Rotational nanofluids for oxytactic microorganisms with convective boundary conditions using bivariate spectral quasi-linearization method

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Journal of Central South University 2020年第3期27卷 824-841页

作者： Mlamuli DHLAMINI hiranmoy mondal Precious SIBANDA Sandile MOTSA School of Mathematics Statistics and Computer ScienceUniversity of Kwa Zulu-NatalPrivate Bag X01ScottsvilePietermaritzburg-3209South Africa Department of Mathematics Brainware University398 Ramkrishnapur RoadBarasatNorth 24 ParganasKolkata-700125India Department of Mathematics University of SwazilandPrivate Bag 4KwaluseniSwaziland

In this study,we considered the three-dimensional flow of a rotating viscous,incompressible electrically conducting nanofluid with oxytactic microorganisms and an insulated plate floating in the *** scenarios were considered in this *** first case is when the fluid drags the plate,the second is when the plate drags the fluid and the third is when the plate floats on the fluid at the same *** denser microorganisms create the bioconvection as they swim to the top following an oxygen gradient within the *** velocity ratio parameter plays a key role in the dynamics for this *** the parameter below and above a critical value alters the dynamics of the *** Hartmann number,buoyancy ratio and radiation parameter have a reverse effect on the secondary velocity for values of the velocity ratio above and below the critical *** Hall parameter on the other hand has a reverse effect on the primary velocity for values of velocity ratio above and below the critical *** bioconvection Rayleigh number decreases the primary *** secondary velocity increases with increasing values of the bioconvection Rayleigh number and is positive for velocity ratio values below *** values of the velocity ratio parameter above 0.5,the secondary velocity is negative for small values of bioconvection Rayleigh number and as the values increase,the flow is reversed and becomes positive.

关键词： bioconvection oxytactic microorganisms velocity ratio rotational nanofluid bivariate spectral quasilinearization method(BSQLM)

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On radiative-magnetoconvective heat and mass transfer of a nanofluid past a non-linear stretching surface with Ohmic heating and convective surface boundary condition

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Propulsion and Power Research 2016年第4期5卷 326-337页

作者： Shweta Mishra Dulal Pal hiranmoy mondal Precious Sibanda School of Engineering and Technology Amity UniversityNew TownKolkataWest Bengal 700135India Department of Mathematics Institute of ScienceVisva-Bharati(A Central University)SantiniketanWest Bengal 731235India School af Mathematics Statistics and Computer ScienceUniversity of KwaZulu-NatalPrivate Bag X01ScottsviUePietermaritzburg 3209South Africa

In this paper magnetoconvective heat and mass transfer characteristics of a two-dimensional steady flow of a nanofluid over a non-linear stretching sheet in the presence of thermal radiation,Ohmic heating and viscous dissipation have been investigated *** model used for the nanofluid incorporates the effects of the Brownian motion and the presence of nanopanicles in the base *** governing equations are transformed into a system of nonlinear oidinary differential equations by using similarity *** numerical solutions are obtained by using fifth order Runge-Kutta-Fehlberg method with shooting *** non-dimensional parameters on velocity,temperature and concentration profiles and also on local Nusselt number and Sherwood number are *** results indicate that the local skin friction coefficient decreases as the value of the magnetic parameter increases whereas the Nusselt number and Sherwood number increase as the values of the Brownian motion parameter and magnetic parameter increase.

关键词： Nanofluid Magnetoconvection Thermal radiation Non-linear stretching sheet Ohmic heating

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