URANS of turbulent flow and heat transfer in divergent swirl tubes using the k-ω SST turbulence model with curvature correction

You, Yonghua; Seibold, Florian; Wang, Sheng; Groß, Ulrich

doi:10.1016/j.ijheatmasstransfer.2020.120088

Cited by 22 publications

(8 citation statements)

References 23 publications

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“…Fluent uses cell-centered formulation and hence reduction in number of cells helps to utilize lower computational resources with faster convergence. 17 It also predicts the flow and heat transfer performances in a swirl tube with reasonable accuracy. Under cell zone conditions, a porous zone is enabled to simulate the presence of metal foams inside the inner fluid and primary zones.…”

Section: Grid Independence Studymentioning

confidence: 91%

“…The recently published work reported by You et al demonstrates that the k-ω SST Curvature Correction (CC) model is computationally cost effective to study the flow through swirl tubes. 17 It also predicts the flow and heat transfer performances in a swirl tube with reasonable accuracy. Under cell zone conditions, a porous zone is enabled to simulate the presence of metal foams inside the inner fluid and primary zones.…”

Section: Ansys Fluent Setupmentioning

confidence: 91%

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Exhaust condensation through porous bed in the primary zone of novel dump diffuser geometry

Prawin

Rose

2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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The work presented in this article deals with the reduction of air pollution generated by automobiles. It is accomplished through the process of condensation using novel techniques such as utilization of porous metal foams. A modified geometry dump diffuser is used to facilitate flow of exhaust gases slowly around copper coils thereby condensing them. The condensed gases can be collected and stored in a chamber and then can be carried to industries for recycling. This article involves design of the modified geometry dump diffuser using CATIA V5 tool. The computational fluid dynamics (CFD) analysis of the model is carried out using the ANSYS Fluent software. The inlet parameters are obtained as per the exhaust characteristics of a typical 0.8 l 3-cylinder Gasoline Engine. The results are presented for modified geometry dump diffuser models with and without porous bed. Porous bed module is used to simulate the presence of metal foams in the primary zone and inside the inner fluid zone. The results are presented. The results show that the modified geometry dump diffuser model with porous bed can cool the exhaust gases to their condensation temperature. This model can be employed in automobiles to reduce air pollution.

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Section: Grid Independence Studymentioning

confidence: 91%

Section: Ansys Fluent Setupmentioning

confidence: 91%

Exhaust condensation through porous bed in the primary zone of novel dump diffuser geometry

Prawin

Rose

2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…Moreover, the Reynolds stress model (RSM) and shear stress transport (SST) k-ω model are commonly utilized to predict swirl flow. [19,20] As an alternative RANS turbulence modelling approach, the RSM model exhibits a reliable prediction capacity in terms of resolving the axial and swirl velocities, Reynolds stress anisotropy, streamlined curvature, and swirling flow effects. [21] Nevertheless, the computational cost of the RSM model is obviously larger than that of the SST k-ω model because it involves solving six transport equations for stress transfer and one TKE dissipation rate equation.…”

Section: Methodsmentioning

confidence: 99%

Insights into the hydrodynamics in the annular pipe of industrial‐scale top‐blown smelting furnace

Wan,

Yang,

Tang

et al. 2024

Can J Chem Eng

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The coaxial jet consisting of swirl jet and axial jet plays a critical role in the industrial processes but is rarely investigated; therefore, it is numerically explored by means of the computational fluid dynamics (CFD) approach in the present work. The force on the swirler, axial and tangential velocity at the annular pipe outlet, and the spatial distribution of swirl number (SN) are selected to evaluate the effect of geometrical parameters on the swirling performance. The results clarify that the velocity and their azimuthal components in the transverse cross‐section can be categorized into six segments based on high/low velocity values. The coaxial jets form a weak swirl with high axial, certain tangential, and low radial velocities. x‐ and y‐vorticity vary within −200 to 200 s−1. Coaxial jet mixing decays the SN. Based on the multi‐objective matrix analysis, swirler height has the largest effect on swirl performance followed by diameter, angle, and number based on analysis. Optimal parameters are 130° vane angle, 240 mm diameter, 10 vanes, and 250 mm height of the swirler.

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“…On the other hand, the κ-ω turbulence model is challenging when dealing with complex flows with severe eddies and significant separations. At the same time, the simulation accuracy is also affected by the choice of turbulence model constants and grid quality [44]. Therefore, simulations that rely on simulator experience are unsuitable for this study.…”

Section: Turbulence Modelmentioning

confidence: 99%

Research on Cavitation Characteristics and Influencing Factors of Herringbone Gear Pump

Yang,

Lee,

Lee

2024

CMES

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Cavitation is a common issue in pumps, causing a decrease in pump head, a fall in volumetric efficiency, and an intensification of outlet flow pulsation. It is one of the main hazards that affect the regular operation of the pump. Research on pump cavitation mainly focuses on mixed flow pumps, jet pumps, external spur gear pumps, etc. However, there are few cavitation studies on external herringbone gear pumps. In addition, pumps with different working principles significantly differ in the flow and complexity of the internal flow field. Therefore, it is urgent to study the cavitation characteristics of external herringbone gear pumps. Compared with experimental methods, visual research and cavitation area identification are achieved through computation fluid dynamic (CFD), and changing the boundary conditions and shape of the gear rotor is easier. The simulation yields a head error of only 0.003% under different grid numbers, and the deviation between experimental and simulation results is less than 5%. The study revealed that cavitation causes flow pulsation at the outlet, and the cavitation serious area is mainly distributed in the meshing gap and meshing area. Cavitation can be inhibited by reducing the speed, increasing the inlet pressure, and changing the helix angle can be achieved. For example, when the inlet pressure is 5 bar, the maximum gas volume fraction in the meshing area is less than 50%. These results provide a reference for optimizing the design and finding the optimal design parameters to reduce or eliminate cavitation.

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URANS of turbulent flow and heat transfer in divergent swirl tubes using the k-ω SST turbulence model with curvature correction

Cited by 22 publications

References 23 publications

Exhaust condensation through porous bed in the primary zone of novel dump diffuser geometry

Exhaust condensation through porous bed in the primary zone of novel dump diffuser geometry

Insights into the hydrodynamics in the annular pipe of industrial‐scale top‐blown smelting furnace

Research on Cavitation Characteristics and Influencing Factors of Herringbone Gear Pump

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