Convective heat transfer and entropy generation in a 3D closed cavity, equipped with adiabatic-driven baffle and filled with CNT (carbon nanotube)-water nanofluid, are numerically investigated for a range of Rayleigh numbers from 103 to 105. This research is conducted for three configurations; fixed baffle (V = 0), rotating baffle clockwise (V+) and rotating baffle counterclockwise (V−) and a r...

Abstract: Numerical visualization of heat transport for convective heat transfer were studied by two-dimensional heat function formulation within a trapezoidal cavity, differentially heated in the vertical direction, is presented. Penalty finite element method is used to obtain the isotherm lines, streamlines and heatlines to perceive the understanding of heat and fluid flow. Numerical results ...

We report an investigation of temperature profiles in turbulent Rayleigh–Bénard convection of water based on direct numerical simulations (DNS) for a cylindrical cell with unit aspect ratio for the same Prandtl number Pr and similar Rayleigh numbers Ra as used in recent high-precision measurements by Funfschilling et al. (J. Fluid Mech., vol. 536, 2005, p. 145). The Nusselt numbers Nu computed ...

We demonstrate, via simulations of asymptotically reduced equations describing rotationally constrained Rayleigh-Bénard convection, that the efficiency of turbulent motion in the fluid bulk limits overall heat transport and determines the scaling of the nondimensional Nusselt number Nu with the Rayleigh number Ra, the Ekman number E, and the Prandtl number σ. For E << 1 inviscid scaling theory ...

This paper is based on the numerical investigation of natural convection two vertical enclosure square and triangular cavity with air filled. The consist adiabatic hot cold wall wide range Rayleigh number from 103 to 106 aspect ratio 1 10 at interval 2.5. Flow patterns isotherm plots were used display results, for every case, local mean Nusselt values also produced. results show that an increas...

Free convection flow in an enclosure filled with a congealing melt leads to the product with a nonuniform structure involving large grains. The convective flows are decreased by applying an appropriate magnetic field, obtaining uniform and small grain structures. In this work, using the finite volume method, we investigated the application of a magnetic field to the convective heat transfer and...

Please cite this article in press as: M. Sankar et a Mass Transfer (2012), http://dx.doi.org/10.1016 Double-diffusive convection in a vertical annulus filled with a fluid-saturated porous medium is numerically investigated with the aim to understand the effects of a discrete source of heat and solute on the fluid flow and heat and mass transfer rates. The porous annulus is subject to heat and m...

Direct numerical simulations of two-dimensional (2D) and three-dimensional (3D), single-mode multi-mode, incompressible immiscible Rayleigh–Taylor (RT) instabilities are performed using a phase-field approach high-order finite-difference schemes. Various combinations Atwood number, Reynolds surface tension, initial perturbation amplitude investigated. It is found that at high numbers, the if si...