Convective heat transfer and friction factor characteristics of helical strip inserted annuli at turbulent flow

Tusar, Mehedi; Bhowmik, Palash K.; Salam, Bodius; Ahamed, Jamal Uddin; Kim, Jung Kyung

doi:10.1016/j.ijheatmasstransfer.2021.121422

Cited by 21 publications

(1 citation statement)

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“…Mehedi et al [23] performed a three-dimensional (3D) computational fluid dynamics (CFD) study of heat transfer and pressure drop phenomena in a vortex flow (4000 ≤ Re ≤ 10000) under the insertion of the helical baffles and rectangular ribs. The results showed that the helical strips are of significant interest to improve the thermal efficiency in the flow at the rings they used with different annular diameter ratios (ADR): 0.6, 0.7, and 0.8.…”

Section: Defect and Diffusion Forum Vol 415mentioning

confidence: 99%

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

Salhi

Amghar

Filali

et al. 2022

DDF

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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 NR ratio increases, and as the Reynolds number increases, NR decreases NR = 6.13, 5.31, 4.62, and 4.30 for case P1, NR = 5.1, 4.5, 3.89, and 3.64, for case P2, NR = 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.

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Section: Defect and Diffusion Forum Vol 415mentioning

confidence: 99%