Effect of the Spacing Design of Two Alternate Baffles on the Performance of Heat Exchangers

Abstract:

The present study investigates numerically the heat transfer process based forced convective flow of an incompressible fluid in a two-dimensional rectangular channel. Two baffles are imposed periodically on the lower and upper walls. The study mainly focused on the influence of the arrangement and spacing separating the baffles on the heat transfer's intensification. The values of the Reynolds number for the present turbulent flow regime were chosen in the range of 10⁴ to 8.73 × 10⁴. The equations resulting from the three conservation laws, namely continuity, Navier-Stokes, and energy equations, are solved numerically based on the finite volume method. SIMPLE algorithm is used to overcome the pressure-velocity coupling, and k-ε model is used for the computation of turbulent patterns. Numerical simulations are carried out to study the dynamic and thermal behavior influenced by the control parameters. The physical quantities calculated are the axial velocity, the local, mean Nusselt numbers and the friction coefficient. The obtained results show that the friction coefficient decreases proportionally with the increase of Re number, and the local Nusselt number increases with the Reynolds number. As the spacing between the baffles decreases, the N_R ratio increases, and as the Reynolds number increases, N_R decreases N_R = 6.13, 5.31, 4.62, and 4.30 for case P₁, N_R = 5.1, 4.5, 3.89, and 3.64, for case P₂, N_R = 5.00, 4.45, 8.83, and 3.51, for case P₃, for equal Reynolds number, 10⁴, 2×10⁴, 4×10⁴, 8.73×10⁴, respectively.

• Periodical: Defect and Diffusion Forum (Volume 415)
• Pages: 53-72
• DOI: https://doi.org/10.4028/p-826179
• Online since: April 2022
• Authors: Jamal-Eddine Salhi, Kamal Amghar*, Abdelkader Filali, Najim Salhi
• Keywords: Alternated Baffles, Forced Convection, Heat Exchangers, Numerical Simulation, Turbulence

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