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Your search keyword '"Sivaraj R."' showing total 137 results
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137 results on '"Sivaraj R."'

8. Computation of inclined magnetic field, thermophoresis and Brownian motion effects on mixed convective electroconductive nanofluid flow in a rectangular porous enclosure with adiabatic walls and hot slits.

Author

Sumithra, A., Sivaraj, R., Prasad, V. Ramachandra, Bég, O. Anwar, Leung, Ho-Hon, Kamalov, Firuz, Kuharat, S., and Kumar, B. Rushi

Subjects
*CURTAIN walls, *NATURAL heat convection, *MAGNETIC fields, *NANOFLUIDS, *THERMOPHORESIS, *NUSSELT number, *BROWNIAN motion, *ZETA potential
Abstract

This analysis theoretically investigates the transport phenomena of mixed convection flows in an enclosure of rectangular geometry saturated with a permeable medium filled with an electrically conducting nanofluid. An inclined magnetic field is taken into consideration. Buongiorno's model is utilized to characterize the nanoliquid. The enclosure has adiabatic walls and hot slits. A uniform cold temperature is maintained at the enclosure's lower and upper walls. The enclosure's vertical walls are thermally insulated with hot slits at the center of the walls. This kind of analysis on mixed convective, electrically conducting nanofluid flows in enclosures finds applications in smart nanomaterial processing systems and hybrid electromagnetic nanoliquid fuel cells. The Marker-And-Cell (MAC) method is utilized to solve the transformed nondimension system of governing equations subject to the fitted boundary conditions. The effects of key physical parameters on streamlines, isotherms, iso-concentration contour plots and the heat transmission rate are examined. The simulations demonstrate that the Richardson number has a predominant impact on the thermo-solutal features of nanofluid flow in the rectangular enclosure. Variations in magnetic field and buoyancy ratio parameters exert a notable influence on the iso-concentrations and isotherms. An increase in the Darcy number values exhibits a tendency to magnify the local heat transfer rate. Higher Grashof number values reduce the local Nusselt number profiles. The effect of porous parameter is significant in the streamlines, isotherms and iso-concentrations. Thus, the porous medium can significantly control the transport phenomena in the enclosure. The concentration, temperature and velocity contours are strongly modified by the variations in the Grashof number. [ABSTRACT FROM AUTHOR]

Published
2024
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9. Semi-analytic solutions and sensitivity analysis for an unsteady squeezing MHD Casson nanoliquid flow between two parallel disks.

Author

Umavathi, J. C., Basha, H. Thameem, Noor, N. F. M., Kamalov, F., Leung, H. H., and Sivaraj, R.

Subjects
BOUNDARY value problems, SENSITIVITY analysis, NANOFLUIDICS, MAGNETOHYDRODYNAMICS, ORDINARY differential equations, BROWNIAN motion, SIMILARITY transformations
Abstract

The transport phenomena of Casson nanofluid flow between two parallel disks subject to convective boundary conditions are analyzed in this paper. The mathematical model incorporates the impact of thermophoresis and Brownian motion since the Buongiorno's nanoliquid model is adopted to characterize the nanoliquid's transport features. The appropriate similarity transformations are applied to obtain the resulting nondimensional ordinary differential equations from the basic governing equations. The resulting ordinary differential equations and the associated boundary conditions are solved analytically by adopting the homotopy perturbation technique. Further, a statistical experiment is conducted to identify notable flow parameters which cause significant impact on the heat transfer rate. The characteristics of critical pertinent parameters on the flow field are graphically manifested. It is worth noting that the Casson nanofluid velocity escalates by augmenting the magnetic field parameter in the case of injection near the disks. Nanoparticle concentration is considerably diminished with an increment in thermophoresis parameter. In the cases of equal and unequal Biot numbers, the heat transfer rate is promoted with higher values of the Brownian motion parameter. Among the Casson fluid parameter, squeezing parameter and magnetic field parameter, the heat transfer rate discloses the highest positive sensitivity with the lowest value of the Casson fluid parameter. [ABSTRACT FROM AUTHOR]

Published
2024
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