Abstract
Heat and mass transfer in many systems are widely accomplished applying natural convection process due to their low cost, reliability, and easy support. Typical applications include different mechanisms in various fields such as (solar energy, solar distiller, stream cooling, etc…). Numerical results of turbulent natural convection and mass transfer in an open enclosure for different aspect ratios (AR = 0.5, 1, and 2) with a humid-air are carried out. Mass fraction and local Nusselt number were proposed to investigate the heat and mass transfer. A heat flux boundary conditions were subjected to the lateral walls and the bottom one make as an adiabatic wall, while the top area was proposed as a free surface. Effect of Rayleigh numbers (106≤????????≤108) on natural convection and mass flow behavior are analyzed. The governing equations are solved using CFD Fluent code based on the SIMPLE algorithm. The results showed that the cavity with an aspect ratio of AR = 2 has a significant enhancement to raise the rates of both heat and mass transfer. When the Rayleigh number increases, maximum heat transfer rates were observed due to the fluid flow becomes more vigorous. However, mass transfer improves as the Rayleigh number decreases.
Highlights
Thermal turbulent flow is used in multiple applications of different mechanisms and systems such as solar energy collectors and evaporation, drying, distillation, and cooling processes of electronic compounds [1,2,3,4,5,6,7,8,9]
This paper investigates the natural convection inside an open cavity through humid-air passes for turbulent flow to examine the impact of Rayleigh number and aspect ratios on the heat and mass transfer at heat flux subjected to the vertical walls
The heat transfer efficiency for the natural convection of humid-air inside open enclosures was influenced by the Rayleigh number at the lateral walls for all aspect ratios
Summary
Thermal turbulent flow is used in multiple applications of different mechanisms and systems such as solar energy collectors and evaporation, drying, distillation, and cooling processes of electronic compounds [1,2,3,4,5,6,7,8,9]. The air-steam mixture flow of the natural convection inside a square cavity with vertical wall temperature and concentration gradients was investigated in [48], proposing a Prandtl number equal to 1.32 and a Rayleigh number equal to 4.05×105. A parametric study of a differentially heated enclosure to treat the natural convection flows that contained a mixture of air and carbon dioxide was conducted in [49], analyzing the effect of change in buoyancy rate on the mass transfer for a laminar system. This paper investigates the natural convection inside an open cavity through humid-air passes for turbulent flow to examine the impact of Rayleigh number and aspect ratios on the heat and mass transfer at heat flux subjected to the vertical walls
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