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Muthtamilselvan, M.,Periyadurai, K.,Doh, Deog Hee Elsevier 2018 Advanced powder technology Vol.29 No.1
<P><B>Abstract</B></P> <P>A numerical work has been carried out to study the effect of heated plate on double diffusive natural convection in a cavity with the presence of Soret and Dufour effects. The vertical left and right sidewalls of the cavity are maintained at constant cold temperatures while the lower and upper walls are considered insulated. The influence of pertinent parameters such as Rayleigh number, Schmidt number, vortex viscosity parameter, Soret and Dufour coefficients and plate non-uniformity parameter on the flow and heat transfer characteristics has been examined. Numerical results show that the heat and mass transfer rate increases with the rise of the Rayleigh number and Schmidt number. It is found that the heat and mass transfer rate are considerably suppressed by the vortex viscosity parameter. In addition, it is observed that the average Nusselt number increases and Sherwood number decreases with increasing Soret and Dufour effects.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We studied the double diffusive convection in a micropolar fluid. </LI> <LI> A thin vertical plate is situated at the middle of the cavity. </LI> <LI> Increasing in the Soret and Dufour parameter is to increase the heat transfer. </LI> <LI> The heat and mass transfer rate of micropolar fluids are found to be smaller. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>Physical model and coordinate system.</P> <P>[DISPLAY OMISSION]</P>
Effect of uniform and nonuniform heat source on natural convection flow of micropolar fluid
Muthtamilselvan, M.,Periyadurai, K.,Doh, D.H. Pergamon Press ; Elsevier Science Ltd 2017 INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER - Vol.115 No.1
Natural convection of micropolar fluid in a square cavity with uniform and nonuniform heated thin plate built in horizontally or vertically is investigated numerically. The non-uniform heating is due to the non-linearly varying temperature of the plate. The vertical walls are cooled while the top and bottom walls are insulated. The flow with in the cavity is assumed to be two dimensional. The governing equations were solved by finite volume method using second order central difference scheme and upwind differencing scheme. The computational results are presented in the form of isotherms, streamlines and average Nusselt numbers. The study was performed for different Rayleigh numbers, Prandtl numbers, length of the heat source, location of the plate, vortex viscosity parameter and source non-uniformity parameters. The result shows that the presence of vortex viscosity parameter retards the fluid velocity and hence the heat transfer rate is decreased. Also, the non-uniformity parameter affects the fluid flow and heat transfer rate especially for higher Rayleigh numbers.
M. Muthtamilselvan,D. Prakash,도덕희 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.9
This work is made to study the effect of local thermal non-equilibrium (LTNE) on transient MHD laminar boundary layer flow of viscous,incompressible nanofluid over a vertical stretching plate embedded in a sparsely packed porous medium. The flow in the porousmedium is governed by simple Darcy model. The model used for the nanofluid incorporates the effects of Brownian motion and thermophoresis. Three temperature model is used to represent the local thermal non-equilibrium among the particle, fluid, and solid-matrixphases. By applying similarity analysis, the governing partial differential equations are transformed into a set of time dependent nonlinearcoupled ordinary differential equations and they are solved by Runge-Kutta Fehlberg Method along with shooting technique. Numericalresults of the boundary layer flow characteristics for the fluid, particle and solid phases are obtained for various combinations ofthe physical parameters. It is found that the thermal non-equilibrium effects are strongest when the fluid/particle, fluid/solid Nield numbersand thermal capacity ratios are small. Moreover, the amount of heat transfer is maximum in nanoparticles than that of fluid and solidphases because of enhancement of thermal conductivity in nanofluids.
Magnetic field effect on mixed convection in a lid-driven square cavity filled with nanofluids
M. Muthtamilselvan,도덕희 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.1
A numerical investigation of laminar mixed convection heat transfer in a lid-driven cavity filled with nanofluid under the influence of amagnetic field is executed. The left and right vertical walls of the cavity are insulated while the top and bottom horizontal walls are keptconstant but different temperatures. The top wall is moving on its own plane at a constant speed while other walls are fixed. A uniformmagnetic field is applied in the vertical direction normal to the moving wall. The governing differential equations are discretised by thecontrol volume approach and the coupling between velocity and pressure is solved using the SIMPLE algorithm. The heat and masstransfer mechanisms and the flow characteristics inside the cavity depended strongly on the strength of the magnetic field. A comparisonis also presented between the results obtained from the Maxwell and modified Maxwell models. The results show that the heat transfer isgenerally higher based on the modified Maxwell model.
Ramya, E.,Muthtamilselvan, M.,Doh, Deog Hee Elsevier 2018 Applied Mathematics and Computation Vol.324 No.-
<P><B>Abstract</B></P> <P>A mathematical model is developed to examine the effects of radiation and slanted magnetic on boundary layer flow of a micropolar fluid containing gyrostatic microorganisms through a vertical fixed or continuous moving porous plate. The governing boundary layer equations are cast into a matrix form and solved analytically by utilizing the state space approach and the inversion of the Laplace transform is carried out, utilizing numerical approach. Numerical outcomes for the momentum, microrotation, density of motile microorganism and temperature distributions are given and illustrated graphically for the problem. Excellent agreement is found when present solutions are compared with the numerical solutions by utilizing the Crank–Nicolson implicit finite difference method. It is found that the density of the motile microorganisms is increasing functions of the bioconvection Lewis number in both cases moving and fixed plate.</P>