Turbulence and thermo‐flow behavior of air in a rectangular channel with partially inclined baffles

Salhi, Jamal‐Eddine; Ajarostaghi, Seyed Soheil Mousavi; Zarrouk, Tarik; Pour, Mohsen Saffari; Salhi, Najim; Salhi, Mourad

doi:10.1002/ese3.1239

Cited by 9 publications

(1 citation statement)

References 50 publications

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“…Furthermore, experimental measurements for pressure drops have helped in developing empirical expressions for plate heat exchangers (PHEs) (Arsenyeva et al, 2012;Gusew and Stuke, 2019). Furthermore, numerical investigations in other applications causing enhancement in heat transfer characteristics include tubes with curved conical tubular inserts (Mousavi Ajarostaghi et al, 2021), rectangular channels in solar heaters with arc-shaped ribs (Kazemi Moghadam et al, 2021) or V-shaped ribs (Kadijani et al, 2022), or channels with partially inclined baffles (Salhi et al, 2022).…”

Section: Flow Distribution and Transport Phenomena In Macroscale Mani...mentioning

confidence: 99%

Computational fluid dynamics simulations to improve performance characteristics of a manifold having a central inlet and outlet

Ganguli

Pandit²

2022

Front. Energy Res.

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In the present work, performance/flow characteristics (namely, the effect of operating parameters like pressure on flow patterns, pressure drop, and the extent of flow uniformity) and transport phenomena of a manifold (header tube assembly) having an inlet and outlet at the center are carried out on a macroscale geometry using CFD simulations. In this study, an existing design available in the published literature (with high flow non-uniformity) was considered and an optimized design (with minimum flow non-uniformity) was developed. The optimization is performed by incorporating a perforated plate (distributor) inside the top header of the manifold. First, CFD simulations for different configurations of the existing design with the perforated plate have been performed for a pressure of 10 bar with steam as a working fluid, and an optimized configuration having a minimum flow non-uniformity of less than 3% is obtained. CFD simulations for both the existing design and optimized design are then performed for a pressure range (10 ≤ p ≤ 70 bar) and the corresponding Reynolds number (Re) range (2.82E+05 ≤ Re ≤ 2.82E+06) with steam as the working fluid. The extent of non-uniformity (ENU) and pressure drop for the existing design (without a distributor) and optimized design (with a distributor) have been analyzed and compared. The optimized design gives the near uniform flow (∼1–4%) for all pressures and Reynolds numbers considered. An empirical correlation relating the friction factor (as per the Chilton–Colburn analogy) and Re has been developed for both designs (with and without a distributor). The predicted friction factors are compared with the present CFD predictions, and experimental data of the shell and tube heat exchanger are available in the published literature. A good agreement within a 10–15% deviation has been observed. Based on the Chilton–Colburn analogy, a correlation for the Nusselt number is obtained from the friction factor correlations for both with and without distributor cases. The correlations for friction factors were found to be valid under any operating conditions for a pressure drop range within 0.05 < ∆p < 1.8 bar irrespective of the design of the distributor, assuming that the manifold is able to withstand the pressure drops in the given range.

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Section: Flow Distribution and Transport Phenomena In Macroscale Mani...mentioning

confidence: 99%

Computational fluid dynamics simulations to improve performance characteristics of a manifold having a central inlet and outlet

Ganguli

Pandit²

2022

Front. Energy Res.

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Enhancing heat transfer performance in a double tube heat exchanger: Experimental study with twisted and helical tapes

Dhumal,

Havaldar

2023

Case Studies in Thermal Engineering

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Thermal performance augmentation in a pipe employing hybrid nanofluid and a plate as turbulator with V-shaped double-winglet ribs

Fan,

Wang,

Liu

et al. 2024

Sci Rep

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This article employs a plate with V-shape ribs inside a tube as turbulator to augment the heat transfer rate. The utilized vortex generators are double-winglets arranged in a V-shape placed on both sides of the plate. The proposed system’s suggested working fluids are water-based hybrid nanofluids, including Al2O3–Cu/water, Cu–CuO/water, and Cu–TiO2/water. This work involves a numerical evaluation of the effects of the type and volume concentration of the examined hybrid nanofluids on the enhancement of heat transfer. The experimental results are used to validate the numerical model. It is worth mentioning that all the obtained numerical results are compared with the simple tube, without any turbulator (vortex generator) and in the presence of water instead of the hybrid nanofluids. Based on the numerical results, it can be concluded that all employed hybrid nanofluids showed improved thermal performance compared to pure water. Furthermore, the differences between the models are more substantial for higher Reynolds numbers than for lower Reynolds numbers. In Re = 30,000, the Cu–TiO2/water exhibits the lowest thermal performance improvement (augmentation of about 0.3%), while the Cu–CuO/water at Re = 50,000 exhibits the largest thermal performance improvement (augmentation of approximately 5.7%), in the case of ∅1 = ∅2 = 0.5%. For ∅1 = ∅2 = 1%, the Cu–TiO2/water at Re = 30,000 has the lowest thermal performance improvement (augmentation of around 1.1%), while the Cu–CuO/water at Re = 50,000 has the most thermal performance improvement (augmentation of roughly 8.7%). According to the augmentation of around 2.8% at Re = 30,000 for Cu–TiO2/water and approximately 10.8% at Re = 50,000 for Cu–CuO/water, the thermal performance increase in the scenario of ∅1 = ∅2 = 1.5% is the lowest. In Conclusion, the Cu–CuO/water hybrid nanofluid with a volume concentration of ∅1 = ∅2 = 1.5% has the greatest thermal performance value of all the hybrid nanofluids studied.

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Turbulence and thermo‐flow behavior of air in a rectangular channel with partially inclined baffles

Cited by 9 publications

References 50 publications

Computational fluid dynamics simulations to improve performance characteristics of a manifold having a central inlet and outlet

Computational fluid dynamics simulations to improve performance characteristics of a manifold having a central inlet and outlet

Enhancing heat transfer performance in a double tube heat exchanger: Experimental study with twisted and helical tapes

Thermal performance augmentation in a pipe employing hybrid nanofluid and a plate as turbulator with V-shaped double-winglet ribs

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