COMPUTATIONAL FLUID DYNAMICAL ANALYSIS OF NEW OBSTACLE DESIGN AND ITS IMPACT ON THE HEAT TRANSFER ENHANCEMENT IN A SPECIFIC TYPE OF AIR FLOW GEOMETRY

摘要

The present work focuses on the study of an interesting topic from different points of view, that is, theoretical, practical, and numerical modeling. This study aims to improve the heat transfer within thermal devices like heat exchangers, solar air collectors, and other electronic equipment; these thermal devices play a major role in the industry these days. This work consists of a computational fluid dynamical analysis of a turbulent forced-convection constant property Newtonian fluid flow, in the presence of two differently shaped solid-type obstacles, that is, flat rectangular and V-upstream shaped, arranged in an overlapping manner, in a horizontal two-dimensional pipe of rectangular section. The effects of obstacle sizes and flow rates are analyzed. The Reynolds averaged Navier?Stokes equations with the standard k-ε turbulence model and the energy equation governing the problem are solved numerically by the finite volume method using the commercial CFD software FLUENT. The results are shown in terms of streamlines, mean velocity field, dimensionless axial velocity profiles, dynamic pressure, turbulent kinetic energy, turbulent intensity, fluid temperature, dimensionless temperature profiles, skin friction coefficients, local and average Nusselt numbers, and thermal enhancement factors.