Numerical analysis of a turbulent flow in a channel provided with transversal waved baffles

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

doi:10.2298/tsci111004099b

Cited by 17 publications

(11 citation statements)

References 16 publications

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“…Pressure losses increased, but the increase in pump power was ignored compared to the increase in heat flux. [15] studied turbulent airflow in a rectangular channel with rectangular and trapezoidal baffles. They found trapezoidal baffles gained velocity per contribution, but increased friction coefficient.…”

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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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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“…The baffles and fins submitted to laminar and turbulent flows have being analyzed in the recent years by several authors, using numerical and/or experimental techniques. In those studies, different aspect ratio channels [1] and different numbers [2,3], sizes [4][5][6][7], positions [8][9][10][11], orientations [12,13], types [14][15][16][17][18][19] and shapes [20][21][22][23][24][25][26][27] of baffles were used. All these techniques increase the thermal transfer rate but created catastrophic pressure losses.…”

Section: Introductionmentioning

confidence: 99%

Low-Reynolds-number turbulent forced-convection flow over graded baffle plates

Menni,

Zidani,

Azzi

et al. 2024

J. Ren. Energies

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The thermo-hydraulic behaviors of turbulent forced-convection heat transfer flow over a rectangular cross section baffled channel are numerically examined in various graded baffle plate ratio configurations ‘GBR = 0.10, 0.11, 0.12, 0.13, 0.14, and 0.15) at different Reynolds numbers, ranging from 12,000 to 32,000. The governing equations that describe the flow are integrated by the finite volumes method, in two dimensions, employing the Commercial CFD software FLUENT 6.3 with low-Reynolds-number k-E model to describe the turbulence. The velocity and pressure terms of momentum equations are solved with SIMPLE-algorithm. In particular, axial velocity, turbulence intensity, pressure, and temperature fields, average Nusselt number and friction loss are obtained. The numerical runs are carried out for different values of Reynolds numbers and graded baffle ratios at constant wall temperature condition along the top and bottom walls. Results were compared with available experimental data from the literature and good agreement is obtained.

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“…The results showed that porous baffles have enhanced influences on heat transfer by 300% compared to straight channels with no baffles. Hamidou et al [5] Introduced a numerical procedure to study the effect of wavy baffle using a rectangular duct section on heat transfer for turbulent flow. The baffle was arranged in the duct wall to produce vortices.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Baffle Inclination on a Heat Recovery Ventilator Performance

Abdulhafedh¹,

Albahadili²,

Hameed³

2022

Proceedings of 2nd International Multi-Disciplinary Conference Theme: Integrated Sciences and Technologies, IMDC-IST 2021, 7-9

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The current research focuses on numerical simulations of recovering low-grade airborne heat to co-save a portion of the energy used by household ventilation. The investigation of three-dimensional steady-state turbulent flow and heat transfer utilizing the CFD approach and the finite volume method with ANSYS software to solve the Naiver Stock and energy equations. The turbulent flow model is governed by the k-ε turbulence model with the SIMPLE-discretization algorithm. To enhance the recovering system thermal performance, two baffles are inserted into both inlet hot and cold channels with changing their inclination (45, 90, and 135°) respectively. The Thermo aerodynamic performance assessments are included velocity, temperature, and effectiveness distribution along with airflow from the leading edge to the end of the core, through the two baffles. The results reveal simply that the flow is characterized by significant deformations. When fixed inclination baffles (45°) are added inside the channel at a constant Reynolds number, the efficacy increases by 35%.

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Numerical analysis of a turbulent flow in a channel provided with transversal waved baffles

Cited by 17 publications

References 16 publications

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

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

Low-Reynolds-number turbulent forced-convection flow over graded baffle plates

The Effect of Baffle Inclination on a Heat Recovery Ventilator Performance

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