Abstract
In the present work, laminar mixed convection of a Newtonian fluid around a hot obstacle in a square cavity with moving vertical walls is studied numerically. The objective of this study is to analyze the effect of the Richardson number (0 ≼ Ri ≼ 10) and Reynolds number (50 ≼ Re ≼ 500) on both hydrodynamic and thermal characteristics around a hot obstacle in the enclosure. The analysis of the obtained results shows that the heat transfer is enhanced for high values of Richardson and Reynolds numbers.
Highlights
For many years, mixed convection flows are present in many transport processes in nature and in engineering devices
The objective of the present study is to examine the influence of the Richardson number Ri and the Reynolds number Re on the hydrodynamic and thermal behavior of the flow within the cavity in the presence of this obstacle
The different results concerning the effect of the Richardson number on the hydrodynamic and thermal structure of the flow under consideration are presented
Summary
For many years, mixed convection flows are present in many transport processes in nature and in engineering devices. Bhuiyan and Munshi [5] studied numerically the phenomena of mixed convection in a lid-driven porous square cavity with internal heat generating. Their conclusion showed that for higher values of the Grashof number and the Darcy number, the streamlines and isotherms are distributed strongly in the enclosed domain and the heat is transferred due to convection. Both Darcy and moving lid ordinations have a significant effect on the flow and thermal fields in the temperature. The obtained results may have direct applications in industrial processes and technologies such as: furnaces, lubrication technologies, drying technologies and others
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