Double-diffusive natural convection in a cavity with an inner cylinder wrapped by a porous layer

Abstract

This paper reports a numerical study of double-diffusive natural convection through an annular space delimited by a square cylinder on the outside and a cylindrical cylinder on the inside covered by a porous layer. The Darcy-Brinkmann-Forchheimer is used for modeling flow in both fluid and porous areas. The annular space is partially or completely filled with an isotropic porous medium. A finite volume method, using the Patankar-Spalding technique is used for solving the discretization of the dimensionless equations governing the problem. The effects of simultaneously applied thermal and solutal buoyancy forces on heat and mass transfer are shown in the results for a large range of buoyancy ratios N, Rayleigh number, and thermal conductivity. Streamlines, isotherms, and iso-concentrations are presented to analyze the flow structure transition from mass species dominated to thermal dominated flow. Results show that the buoyancy ratio can change the flow pattern and the increased thermal conductivity ratio can improve heat and mass transfer. A good agreement was obtained between the present results and those published were found.

Enhanced thermal performance and entropy generation analysis in a novel cavity design with circular cylinder

“…Furthermore, NC flow is notably influenced by the presence of a cylinder within a cavity. 27 Moderres et al 28 examined the impact of a cylinder within a cavity on NC flow, revealing that the presence of the cylinder can alter the flow pattern and enhance heat and mass transfer.…”

“…Furthermore, NC flow is notably influenced by the presence of a cylinder within a cavity 27 . Moderres et al 28 examined the impact of a cylinder within a cavity on NC flow, revealing that the presence of the cylinder can alter the flow pattern and enhance heat and mass transfer. Similarly, Saleh et al 29 examined NC within a porous cavity featuring a temperature gradient between an outer cavity and an inner cylinder.…”

Double-diffusive stagnation point flow over a vertical surface with thermal radiation: Assisting and opposing flows

“… 34 Tizakast et al 35 have worked on double-diffusive mixed convection flow in rectangular cavities, and two different geometries are taken into account in double-diffusive mixed convection by some more researchers. 36 , 37 In this case, a parallel solution is obtained, as well as the dependence of 15 dimensionless independent parameters. Our focus is on the investigation of boundary layer behavior in the model.…”