Numerical CFD analysis and experimental investigation of the geometric performance parameter influences on the counter-flow Ranque-Hilsch vortex tube (C-RHVT) by using optimized turbulence model

Bazgir, Adib; Khosravi‐Nikou, Mohammad Reza; Heydari, Ali

doi:10.1007/s00231-019-02578-1

Cited by 16 publications

(6 citation statements)

References 61 publications

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“…It is shown in the literature that the RNG k-ε turbulence model can accurately reflect the distribution of temperature and flow fields inside the VOTU. Bazgir [17,18] used the RNG k-ε turbulence model in numerical simulations and the results showed that the energy separation mechanism of the VOTU could be clearly predicted, and the outlet temperature at the hot and cold ends has a small difference compared with the experimental value. In this study, the RNG k-ε turbulence model is used for numerical simulation, and swirl Dominated Flow and Curvature Correction are to be selected in the viscous model.…”

Section: Governing Equationsmentioning

confidence: 99%

Numerical Simulation of the Effect of Different Numbers of Inlet Nozzles on Vortex Tubes

Xu¹,

Xie

2021

Processes

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In order to broaden the application of vortex tubes (VOTU) in industry and to improve the efficiency of cooling and heating, numerical simulations of vortex tubes were carried out. In this study, the temperature, velocity, and pressure fields of three VOTUs with inlet nozzles of 2, 3, and 6 were investigated at different inlet pressures based on previous experimental data and by three-dimensional numerical simulation. It was found that the increase of inlet pressure leads to the increase of energy separation between the hot and cold ends of the three VOTUs. As the number of inlets increases, the pressure difference between the tube wall and the core region gradually strengthens. In contrast, the pressure in the tube center is not affected by the inlet pressure. The number of nozzles affects the inlet and outlet temperatures of the VOTU. When the number of nozzles is 3, and the inlet pressure is 0.6 MPa, the VOTU shows the maximum hot and cold outlet temperature difference of 66 K. The maximum velocity of VOTU appears at the connection of the inlet and vortex chamber, so the inlet is tangential to VOTU, which is beneficial to reduce the loss of gas energy. The wall thickness of the inlet increases gradually to avoid the high-speed gas flow on the erosion of the wall surface. This study has profound guidance for the one-dimensional design of VOTUs.

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Section: Governing Equationsmentioning

confidence: 99%

Numerical Simulation of the Effect of Different Numbers of Inlet Nozzles on Vortex Tubes

Xu¹,

Xie

2021

Processes

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“…Summarized results were established on the COP, isentropic efficiency, the temperature difference was recorded at maximum with parallelogram and minimum with rectangle fins. Bazgir et al 13 explained on temperature detachment was explained using different turbulence models of a straight tube with the counter flow of RHVT; RNG k–ϵ model with respective to FMV; The results were explained 20 divergence is the optimal and critical length as 166 mm temperature elimination with increased with the number of nozzles. Cartlidge et al 14 investigated with divergent vortex tube with an inlet pressure of 3–7 bar, with a mass flow rate range of 0.05–0.14 kg s −1 .…”

Section: Introductionmentioning

confidence: 99%

CFD simulation on optimum material to fabricate the counter flow of Ranque–Hilsch vortex tube

Rao

Ramesh

Hampali

2022

Sci Rep

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The basic objective of the current investigation by using CFD simulation is to select the appropriate material to fabricate Vortex tubes in meteorological conditions, which can improve efficiency and performance. The simulation results of vortex tubes were used in obtaining the performance for various materials such as copper, stainlessteel, brass, PVC, CPVC, acrylic, nylon, and bronze. The ratio of length of the hot tube and inner diameter was chosen as (L/D) 40 with the consistent inner diameter of the hot tube as 15 mm. Compressed air is passed through an inlet pipe between 2 and 12 bars in the step of 2 bars. 2D CFD was developed and analyzed with Ansys Fluent to access the performance of the vortex tube. Finally, after evaluating all simulation values for eight materials for performance depending upon their physical properties varies in the sequence from copper–bronze–brass–stainless steel–CPVC–PVC–acrylic–nylon material.

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“…It was because of the inherent drawbacks of centrifugal separation. By computational fluid dynamics analysis, Bazgir et al 9 found that energy separation within the cyclone was directly caused by pressure loss and grew as much as the pressure loss increased. Seyyed Hosseini et al 10 proposed that the inlet volume fraction showed a minor effect on the improvement of the collection efficiency.…”

Section: Introductionmentioning

confidence: 99%

Effects of the Swirl Space Ratio on the Performance of a Coupling Cyclone with a Built-In Granular Bed Filter: An Experimental Examination

Chang

Dao-ming

Gao

et al. 2020

Ind. Eng. Chem. Res.

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The gas–solid separator of coupling cyclone with a built-in granular bed filter (GBF) was proposed to capture dust emitted from the industrial source. The coarse dust was separated by the rotatory motion, and the fine dust entrained by the swirl was collected by the GBF. A new geometrical parameter, named as the swirl space ratio, was introduced to characterize the mutual impacts on the coupled separator. Experimental results showed that the pressure drop decreased 10% when the swirl space ratio increased from 0.37 to 0.43, while the collection efficiency was enhanced significantly. The coupled separator with a large swirl space ratio exhibited excellent separation characteristics according to the separation quality factor. Furthermore, the contribution ratio of the cyclone shell was strengthened by increasing the swirl space ratio. The variation in the bed voidage and the pressure drop was completely opposite. The breakage phenomenon was observed in the circulation of the collector particles.

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Numerical CFD analysis and experimental investigation of the geometric performance parameter influences on the counter-flow Ranque-Hilsch vortex tube (C-RHVT) by using optimized turbulence model

Cited by 16 publications

References 61 publications

Numerical Simulation of the Effect of Different Numbers of Inlet Nozzles on Vortex Tubes

Numerical Simulation of the Effect of Different Numbers of Inlet Nozzles on Vortex Tubes

CFD simulation on optimum material to fabricate the counter flow of Ranque–Hilsch vortex tube

Effects of the Swirl Space Ratio on the Performance of a Coupling Cyclone with a Built-In Granular Bed Filter: An Experimental Examination

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