The problem of Magnetohydrodynamic (MHD) free convection heat transfer in a square open cavity containing a heated circular cylinder at the centre has been investigated in this work. As boundary conditions of the cavity, the left vertical wall is kept at a constant heat flux, bottom and top walls are kept at different high and low temperature by: 4. Buoyancy-driven airflow that included two isothermal inner plates established in a vented cavity is investigated numerically. The thermally optimum wall-to-wall spacing of the immersed channel, as well as its dependence with respect to the relevant governing parameters, are determined. Results are presented as a function of the aspect ratio b/H for a wide range of Rayleigh numbers RaH. Flow and temperature fields. The buoyancy-driven flow and temperature fields in the enclosure for a cold plate and a hot plate with the variation of location ratios a/H and b/H are illustrated by means of contour maps of streamlines and isotherms, respectively, as exemplified in Figs. 3 to For Fig.3 (a-f), there are two vortices flow where the directions are different for cold plate Cited by: 1. de Vahl Davis, G., and Jones, I. P., , “The Effect of Vertical Temperature Gradients on Multi-cellular Flows in High Aspect Ratio Cavities,” Proc. Conference on Liquid Metal Technology in Energy Production, Oxford, United Kingdom, pp. 9–Cited by:

Natural Convection – Heat Transfer. Similarly as for forced convection, also natural convection heat transfer take place both by thermal diffusion (the random motion of fluid molecules) and by advection, in which matter or heat is transported by the larger-scale motion of currents in the fluid. At the surface, energy flow occurs purely by conduction, even in convection. Natural convection in a rectangular porous cavity with constant heat flux on one vertical wall F. A. / Natural convection in a rectangular porous cavity with constant heat flux on one vertical wall. In: Journal of Heat Transfer. ; Vol Flow patterns are observed to be quite different from those in the case of a cavity with both Cited by: The onset of natural convection in a 2D air filled cavity open at the top with adiabatic side walls is studied. The numerical model shows the existence of weak convective flow near the top corner of a cavity due to the thermal gradient between the walls and the atmosphere even at low Rayleigh numbers, as also confirmed by the interferometry-based experimental by: 6. Steady natural convection flows in a square cavity with linearly heated side wall(s).

Flow patterns of two-dimensional natural convection in a vertical air-filled tall cavity with differentially heated sidewalls are investigated. Numerical simulations based on a finite difference method are carried out for a wide range of Rayleigh numbers and aspect ratios from the onset of the steady multicellular flow, through the reverse transition to the unicellular pattern, to the unsteady Cited by: Timothy A. Dunn and Rose C. McCallen, Parallel computations of natural convection flow in a tall cavity using an explicit finite element method, International Journal for Numerical Methods in Fluids, 40, 8, (), ().Cited by: The problem of transient natural convection in a cavity of aspect ratio A [les ] 1 with differentially heated end walls is considered. Scale analysis is used to show that a number of initial flow types are possible, collapsing ultimately onto two basic types of steady flow, determined by the relative value of the non-dimensional parameters describing the by: This paper investigates the entropy generation and natural convection inside a C-shaped cavity filled with CuO-water nanofluid and subjected to a uniform magnetic field. The Brownian motion effect is considered in predicting the nanofluid properties. The governing equations are solved using the finite volume method with the SIMPLE (Semi-Implicit Method for Pressure Linked Equations) by: