Numerical Study on Turbulent Flow Forced-Convection Heat Transfer for Air in a Channel With Waved Fins

Benzenine, Hamidou; Saïm, Rachid; Abboudi, Saïd; Imine, Omar

doi:10.5755/j01.mech.19.2.4154

Cited by 10 publications

(6 citation statements)

References 16 publications

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“…We could then observe that our results are in good agreement with those presented by the authors [43,45]. In a second step, we considered the case of a channel with baffles and compared our calculated results with the only results given in the literature where Benzenine et al [46] conducted the same study, but with wavy baffles. In this case, we could see that there is a disagreement between the two results.…”

Section: Code Validationsupporting

confidence: 86%

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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: Code Validationsupporting

confidence: 86%

“…In this case, we could see that there is a disagreement between the two results. Indeed, after we analyzed the results, we found that the values of the average Nusselt number obtained in the study of Benzenine et al [46] are lower than the values given in the literature in the smooth case. However, logically they should be higher.…”

Section: Code Validationmentioning

confidence: 51%

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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“…They found that triangular wavy baffles were more effective than without baffles for heat transfer. [17] studied heat transport in a rectangular channel with two corrugated fins. They found that shortening fin distance increased Nusselt number and pressure loss.…”

Section: Introductionmentioning

confidence: 99%

Effect of baffle configuration on the thermal performance attributes of shell and semi-circular tube heat exchangers

Almulla,

Moawed,

Abd Elrahaman

et al. 2024

Engineering Research Journal (Shoubra)

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This study aims to improve the performance characteristics of a shell-tube heat exchanger in counterflow configuration. It considers the effect of using baffles and semicircular tubes as heat transfer surfaces. Twenty-nine heat exchangers are designed and constructed, consisting of tubes of circular or semicircular tubes (SCTs) with base spacing ratios ( ) ranging from 23.6% to 55.1%. The examined baffles have a pitch ratio ( ) of 1.47 to 2.36, a total cut ratio () of 16.5% to 25% and have two cutting configurations: edge cutting with a cutting ratio () of 0% to 16.5% and internal cutting baffles with a cutting ratio () of 0% to 16.5%. The experiments are done for Reynolds () and Prandtl numbers ( ). The results show that using baffles and/or SCTs increases the heat transfer rate and pressure loss, and when the SCT spacing ratio increases and baffles cut and pitch ratios decrease, these performance metrics significantly rise. However, baffles with edge cutting are better than those with internal cutting. The hydrothermal performance index is evaluated using the Stanton number of the shell side and ratios, with a maximum value of 2.54 achieved by utilizing baffles of  =  = 16.5%,  = 0, = 1.47, and SCTs of = 55.1%, and lowest shellside flow rate and inlet temperature. Finally, correlations are introduced to predict and , besides the performance index of the tested heat exchangers .

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“…The most efficient way to improve the convective heat transfer in a rectangular channel is the use of vortex generators and baffles as disrupting elements of the flow. Numerous experimental (Lu and Jiang, 2006;Sriromreun et al, 2012;Caliskan, 2014;Skullong and Promvonge, 2014) and numerical investigations (Chennu, 2018;Cruchaga et al, 2016;Luo et al, 2019;Youcef et al, 2019;Benzenine et al, 2013aBenzenine et al, , 2013bSaim et al, 2013;Bouchenafa et al, 2015) were focused in the exchangers. Perforated baffles represent more suitable turbulence promoters than solid deflectors to improve the thermo-hydraulic performance of fluid circulating in a rectangular channel (Ary et al, 2012;Thakur, 2013a, 2013b;Thakur, 2013a, 2013b).…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional analysis of heat transfer in a channel provided with solid baffle, single and double perforation

Benzenine

Saïm

Abboudi

et al. 2019

HFF

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Purpose The purpose of this paper is to present a three-dimensional (3D) analysis of the laminar flow of air and the conjugate heat transfer in a pipe of rectangular cross-section with a solid or perforated deflector inserted on the lower wall. Design/methodology/approach To this end, by using the finite volume method, the conservation equations for mass, momentum and energy are solved numerically. Two cases of “single and double” perforation were studied and compared with that of the solid case for a range of Reynolds numbers ranging from 140 to 840. The velocity and temperature profiles were plotted and interpreted on three different sections placed sequentially upstream, mid-stream and downstream of the deflector. Total heat exchange at the bottom wall, outlet fluid temperature, perforated PFE deflector performance and pressure loss is presented for different cases studied and for different Reynolds numbers. Findings The results show that although the perforated deflector improves the heat transfer, it also results in additional pressure losses; the study also showed the existence of a limiting velocity beyond which the perforation effect on the improvement of the heat exchange decreases until the same performance of the solid deflector is achieved. Originality/value The main originality of this work is to show a 3D analysis for a perforated baffle as heat exchanger application.

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Numerical Study on Turbulent Flow Forced-Convection Heat Transfer for Air in a Channel With Waved Fins

Cited by 10 publications

References 16 publications

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

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

Effect of baffle configuration on the thermal performance attributes of shell and semi-circular tube heat exchangers

Three-dimensional analysis of heat transfer in a channel provided with solid baffle, single and double perforation

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