A computational work on turbulent flow and heat transfer in a channel fitted with inclined baffles

Saïm, Rachid; Bouchenafa, Rachid; Benzenine, Hamidou; Öztop, Hakan F.; Al‐Salem, Khaled; Abboudi, Saïd

doi:10.1007/s00231-013-1121-3

Cited by 16 publications

(6 citation statements)

References 23 publications

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“…The friction factor ratio goes up with an increase in the Reynolds number, but its value depends on the arrangement of baffles. A numerical validation of this work has been done by R. Saim and al [11]. The numerical results have showed that the inclined baffles improve the friction factor and the heat transfer.…”

Section: Introductionmentioning

confidence: 75%

“…These zones may represent pollution areas, where the pollution remains retained. [6], the impact of the inclined baffles on the flow structure of the near wall for different Reynolds numbers. The objective of this study is to perform the flat plate collector with using computational fluid dynamics simulation to perform detailed fluid flow and heat transfer analysis.…”

Section: Introductionmentioning

confidence: 99%

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Air Behavior Inside Duct of Air Solar Collector with Three Models of Baffles

Henaoui

Aliane

2020

AJRESD

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The objective of this work is to study numerically the effect of the geometry of the baffles on the heat exchange in a solar air collector. Three models of collector were used in this study, fitted with simple baffles and perforated baffles. Fluid dynamics calculation (CFD) tool has been used to simulate the geometries of the solar collectors. Its three models involving air intake, are modeled by the FLUENT6.3 software and the grids were created with the Gambit software. The shape of the perforations is in the forms strips perforated in the baffles. The numerical resolution uses the finite volume method and the turbulence modeling K-Epsilon. The results have been validated by previous work and the simulation results are in terms of the evolution of the axial velocity and temperature distribution for the three models.

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Section: Introductionmentioning

confidence: 75%

Section: Introductionmentioning

confidence: 99%

Air Behavior Inside Duct of Air Solar Collector with Three Models of Baffles

Henaoui

Aliane

2020

AJRESD

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“…In the pure ribbed duct, the rib shape can change the heat transfer significantly (Wang et al, 2018a;Promvonge et al, 2011). In a channel with baffles, the rib shape also impacts the heat transfer and flow structure (Benzenine et al, 2013(Benzenine et al, , 2016(Benzenine et al, , 2018Saim et al, 2013). Therefore, this paper investigates the effect of the rib shape on the thermal performance of a labyrinth channel.…”

Section: Heat Transfer In a Labyrinth Channelsmentioning

confidence: 99%

Enhanced heat transfer in a labyrinth channels with ribs of different shape

Wang

et al. 2019

HFF

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Purpose The purpose of this study is to enhance the thermal performance in the labyrinth channel by different ribs shape. The labyrinth channel is a relatively new cooling structure to decrease the temperature near the trailing region of gas turbine. Design/methodology/approach Based on the geometric similarity, a simplified geometric model is used. The k − ω turbulence model is used to close the Navier–Stokes equations. Five rib shapes (one rectangular rib, two arched ribs and two trapezoid ribs) and five Reynolds numbers (10,000 to 50,000) are considered. The Nusselt number, flow structure and friction factor are analyzed. Findings Nusselt number is tightly related to the rib shape in the labyrinth channel. The different shapes of the ribs result in different horseshoe vortex and wake region. In general, the arched rib brings the highest Nusselt number and friction factor. The Nusselt number is increased by 15.8 per cent compared to that of trapezoidal ribs. High Nusselt number is accompanied by the high friction factor in a labyrinth channels. The friction factor is increased by 64.6 per cent compared to rectangular ribs. However, the rib shape has a minor effect on the overall thermal performance. Practical implications This study is useful to protect the trailing region of advanced gas turbine. Originality/value This paper presents the flow structure and heat transfer characteristics in a labyrinth channel with different rib shapes.

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“…They observed a significant increase in pressure drop and a 2.1 to 4.3 times increase in Nusselt number when the baffle height equaled the trough height. Saim et al (2013) conducted numerical investigations on heat transfer and turbulent flow along ducts with inclined baffles, noting improved friction factor and heat transfer with inclined baffles. Alnak (2020) numerically studied heat transfer, pressure drop, and thermohydraulic performance of cross-grooved triangular ducts with rectangular baffles at different settlement angles.…”

Section: Introductionmentioning

confidence: 99%

Exploring the Impact of Geometric Parameters on Heat Transfer and Fluid Flow Characteristics in Cross-Triangular Grooved Channels: A Computational Study

Alnak

2024

Isı Bilimi Ve Tekniği Dergisi

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In this study, the impact of geometric parameters of rectangular baffles with varying location angles and heights is investigated on the heat transfer and fluid flow characteristics of cross-triangular grooved channels. Computational methods are employed to explore these effects, utilizing the Ansys-Fluent program to solve the Navier-Stokes and energy equations, incorporating the k-ε turbulence model for numerical simulations. The inlet temperature of the air, serving as the working fluid, is set at 293 K, while the wall surface temperature of the lower triangular grooved channel remains fixed at 373 K. Rectangular baffles are tested with angles of 30°, 60°, and 90°, and heights of 0.25H, 0.5H, and 0.75H, respectively. The numerical results show good agreement with a 3.53% deviation compared to existing empirical data in the literature. The obtained findings are presented in terms of mean Nusselt (Num) number, fluid temperature, and Performance Evaluation Criterion (PEC) number variations taking into consideration of pressure drop for each rectangular baffle angle and height. Additionally, contour distributions of temperature and velocity are evaluated for different Reynolds numbers (Re) and arrangements of rectangular baffles. It has been determined that the Nu number value increases by 197.56% at a 90° angle and 0.75H height, compared to the 0.25H baffle height at Re=6000. Furthermore, at Re=1000, the PEC number is 84.50% higher with a baffle height of 0.25H and a baffle angle of 30° compared to the condition with a 90° angle.

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A computational work on turbulent flow and heat transfer in a channel fitted with inclined baffles

Cited by 16 publications

References 23 publications

Air Behavior Inside Duct of Air Solar Collector with Three Models of Baffles

Air Behavior Inside Duct of Air Solar Collector with Three Models of Baffles

Enhanced heat transfer in a labyrinth channels with ribs of different shape

Exploring the Impact of Geometric Parameters on Heat Transfer and Fluid Flow Characteristics in Cross-Triangular Grooved Channels: A Computational Study

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