THERMAL SCIENCE

International Scientific Journal

Thermal Science - Online First

Mohamed A. Karali

,

Bandar Awadh Almohammadi

,

Rayed S. Alshareef

,

Ahmed Gad

,

Hassanein A. Refaey

,

Khaled Zied

online first only

Heat transfer enhancement and pressure drop from tube bank with splitter plates in cross flow employing RANS and LES turbulence models

ABSTRACT
Heat transfer enhancement from tube bank in cross flow with air can be achieved for energy saving by enhancing the flow turbulence nature. Adding splitter plates (SPs) to the tubes' trailing edges, besides, increasing the heat transfer surface's roughness are proposed options to enhance the flow turbulence. However, few literatures are available to discuss this, moreover, almost all available Computational Fluid Dynamics (CFD) models employ Reynolds-Averaged Navier-Stokes (RANS) turbulence models and away from using Large Eddy Simulation (LES). Accordingly, this work was presented to compare the employing of RANS and LES turbulence models for such problems at low Reynolds numbers. Toward this objective, a complete 3D CFD model consisting of seven rows of tubes in flow direction is developed without using any symmetrical boundary conditions. The present study includes the impact of the Remax range (500 to 4500), for three surface relative roughnesses: ks/D of 0, 0.01, and 0.02. The local turbulence and heat transfer characteristics are discussed. The findings confirmed that the two proposed options for heat transfer enhancement succeeded in doubling it. LES is superior to RANS models in resolving a wide spectrum scale of flow eddies. The results are useful in designing more efficient heat exchangers, especially at low Reynolds number.
KEYWORDS
heat transfer, Tube bank, Reynolds-Averaged Navier-Stokes, large eddy simulation, pressure drop
PAPER SUBMITTED: 2024-12-09
PAPER REVISED: 2025-01-11
PAPER ACCEPTED: 2025-01-16
PUBLISHED ONLINE: 2025-02-16
DOI REFERENCE: https://doi.org/10.2298/TSCI241209026K
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Heat transfer enhancement and pressure drop from tube bank with splitter plates in cross flow employing RANS and LES turbulence models