Abstract
A computational fluid dynamic analysis of thermal and aerodynamic fields for an incompressible steady-state flow of a Newtonian fluid through a two-dimensional horizontal rectangular section channel with upper and lower wall-attached, vertical, staggered, transverse, cascaded rectangular-triangular (CRT), solid-type baffles is carried out in the present paper using the Commercial, Computational Fluid Dynamics, software FLUENT. The flow model is governed by the Reynolds averaged Navier-Stokes (RANS) equations with the SST k-ω turbulence model and the energy equation. The finite volume method (FVM) with the SIMPLE-discretization algorithm is applied for the solution of the problem. The computations are carried out in the turbulent regime for different Reynolds numbers. In this study, thermo-aeraulic fields, dimensionless axial profiles of velocity, skin friction coefficients, local and average heat transfer coefficients, and thermal enhancement factor were investigated, at constant surface temperature condition along the heated upper wall of the channel, for all the geometry under investigation and chosen for various stations. The impact of the cascaded rectangular-triangular geometry of the baffle on the thermal and dynamic behavior of air is shown and this in comparing the data of this obstacle type with those of the simple flat rectangular-shaped baffle. This CFD analysis can be a real application in the field of heat exchangers, solar air collectors, and electronic equipments.
Highlights
IntroductionThe first study on the numerical analysis of the features of the flow and forced-convection heat transfer in periodically varying cross section ducts was reported by Patankar et al [1]
The effect of the cascaded rectangular-triangular baffle (CRTB) (a/b = 0.5) on the flow pattern of the near solid surface is reported and this in comparing the results of this type with those of the simple flat rectangular-shaped baffle (a/b = 0)
The streamlines are generated by the effect of the expansion of the flow out of the section formed by the baffles and the walls
Summary
The first study on the numerical analysis of the features of the flow and forced-convection heat transfer in periodically varying cross section ducts was reported by Patankar et al [1]. The fluid flow and heat transfer through staggered wall-mounted two-dimensional obstacles, put on the bottom and top walls of the channel, were attentively examined by Mohammadi Pirouz et al [4], using the Lattice Boltzmann Method (LBM). The authors concluded that the Lattice Boltzmann Method (LBM) is well suited for studying the heat transfer in conjugate problems. The flow and convective heat transfer characteristics of a three-dimensional square duct with various arrangements of fins in both laminar and turbulent flow were numerically characterized and studied by Period.
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