Double Diffusive Mixed Convection Heat Transfer inside a Vented Square Cavity

Abstract

A numerical study has been carried out for laminar double-diffusive mixed convection in a twodimensional vented square cavity with discrete heat and contaminant sources applied on the bottom wall. An external air flow enters the cavity through an opening located at the bottom of the left vertical wall and exits from an opening located at the three different positions of the opposite wall. The developed mathematical model is governed by the two-dimensional continuity, momentum, energy, and concentration equations. The governing equations, written in non-dimensional form are solved by using Galerkin finite element method with triangular grid discretization system. The Reynolds number is fixed at 100 and the working fluid is considered as air. Numerical simulations are carried out for different combinations of the thermal Grashof numbers and results are presented in terms of streamlines, temperature and concentration distributions. The results indicate that the average Nusselt and Sherwood numbers on the heat and contaminant sources strongly depend on the positioning of the exit opening.

Numerical Study of Heat and Water Vapour Exchanges Inside a Green Roof Building in a High Irradiation Area for Passive Cooling Purpose

“…Furthermore, in order to verify the accuracy of our numerical procedure, we tested our algorithm based on the grid size 81x81 for a square enclosure with a discrete bottom wall heated and saturated with water. This computation of Sumon Saha [16] for mixed convection heat transfer inside a vented square cavity was validated and found to agree quite well. Similar distribution of streamlines is obtained as shown in figure 3.…”

Effects of buoyancy ratio on unsteady double-diffusive natural convection in a cavity filled with porous medium with non-uniform boundary conditions

“…Teamah [12] studied double-diffusive convective flow in a rectangular enclosure with the upper and lower surfaces being insulated and impermeable by imposing constant temperature and concentration along the left and right walls of the enclosure and a uniform magnetic field was applied in a horizontal direction. Saha et al [13] investigated the new characteristics of the airflow and heat/contaminant transport mechanism inside a vented cavity in terms of streamlines, isotherms and isoconcentration lines.…”

Double‐diffusive natural convective stream due to moving vertical plate with nonlinear thermal radiation and Newton's boundary constraint

“…Similarity solution of double diffusive natural convective stream over a moving vertical uniform plate with newton boundary constraint and convection with variable viscosity from a vertical curtailed cone in spongy media in the existence of magnetic field and radiation influences 11,12 . Numerical investigation of double‐diffusive‐blended convection in a couple stress fluids with variable fluid properties, heat transfer inside a vented square cavity, and heated cylinder in an enclosure 13‐16 . Tadmor and Klein 17 explored the industrial principles of plasticizing extrusion, polymer science, and engineering series.…”