Aerodynamics and Heat Transfer over Solid-Deflectors in Transverse, Staggered, Corrugated-Upstream and Corrugated-Downstream Patterns

Ahmed Azzi,Ali J Chamkha,Younes Menni

doi:10.3311/ppme.11972

Abstract

Computational fluid dynamic simulations were conducted to analysis the influences of two different deflector orientations on turbulent forced-convection flow and skin friction loss of two-dimensional horizontal rectangular cross section channels with upper and lower wall-attached corrugated baffles. The governing flow equations, i.e., continuity, momentum, and energy, were numerically solved by the Finite Volume Method (FVM) using the Semi-Implicit Method for Pressure Linked Equation (SIMPLE) discretization formulation. The help of the CFD code FLUENT was employed to solve the dynamic and thermal behavior of air in the whole domain under investigation. The flow rate in terms of Reynolds number is ranged from 5,000 to 32,000. The obtained results show that augmenting the Reynolds number makes the dynamic thermo energy field redirect in the vicinity of deflector corners, and forces an augmentation in the thermal transfer rate from baffles.

Highlights

Several researcher works have examined the baffled air channels numerically and experimentally to enhance the performance
The streamlines in the corrugated baffled channel are presented for different Reynolds number values (Re = 5,000, 10,000, 15,000, and 20,000), as shown in Fig. 4 (a-d), respectively
Downstream of the corrugated baffles, the current lines are generated by the effect of flow expansion, leaving the section formed by the corrugated baffles and the walls

Summary

Introduction

Several researcher works have examined the baffled air channels numerically and experimentally to enhance the performance. Promvonge et al [2] carried out a numerical investigation to examine laminar flow and heat transfer characteristics in a three-dimensional isothermal wall square channel with 45° angled baffles. Yongsiri et al [3] reported the results of numerical study of turbulent flow and heat transfer in a channel with inclined detached-ribs. The fluid flow, temperature field and thermal performance of the inclined detached-ribs with different attack angles (from 0° to 165°), were examined and compared with those of the typical transverse attached rib with the attack value of 90°. The computational results showed that, at high Reynolds number, the inclined ribs with attack angles of 60° and 120° yield comparable heat transfer rates and thermal performance factors which were higher than those given by the ones with other angles. Mellal et al [4] numerically analyzed the thermal and dynamic characteristics in the shell side of a shell and tube heat exchanger (STHE) fitted with segmental baffles and different

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