Experimental investigation on improving the energy separation efficiency of vortex tube by optimizing the structure of vortex generator

Liang, Fachun; Tang, Genyang; Chun, Xu; Wang, Chi; Wang, Zhengyu; Wang, Jiaxin; Li, Naiming

doi:10.1016/j.applthermaleng.2021.117222

Cited by 25 publications

(5 citation statements)

References 36 publications

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“…For comparison purposes, tap water is taken as the incident fluid for numerical solution of the model which's vortex tube structural parameters from literatureGuo and Zhang (2018); Rafiee and Sadeghiazad (2016); Liang et al (2021); Xue et al (2019)here. The list of parameters involved is as follows.…”

Section: The X-axis Equations Of Motion Of the Fluidmentioning

confidence: 99%

Modeling the flow deflection characteristics of incompressible fluids in the vortex chamber and analysis of its influencing parameters

Liu

Cao

Han

et al. 2023

Preprint

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In this paper, the deflection characteristics of incompressible fluid trajectories in nonuniform vertical perforations are investigated. The hydrodynamic equations of the model are established based on the basic equations of fluid mechanics and finite element analysis methods. The effect of the difference in diameter between the two sides of the hole and the control of the incident fluid parameters on the trajectory deflection produced by the fluid is shown. The results show that: 1. The aqueous fluid is deflected towards the side of the hole with the larger diameter by the nonequivalent vertical throughhole structure. The deflection angle increases with increasing nonequivalent ratio and decreases with increasing incident fluid pressure.2 In order to achieve directional deflection of vertically incident aqueous fluids, the nonlinear coupling between incident fluid pressure and vertical span is investigated in this paper and suitable equations are developed.3. From the results, the incompressible aqueous fluid cannot achieve natural vortex initiation in a vortex tube where the inlet axis is the same as the vortex chamber axis, with a maximum deflection of 0.12 mm in the vortex chamber.4. If | λ2 -λ3 | is increased to 2.45 without considering the constraint that the diameter of the model vortex chamber is larger than the height of the vortex chamber, the water body can shoot out of the vortex chamber while its tangential velocity can reach 22.07 m/s, which can produce the spiral effect.

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Section: The X-axis Equations Of Motion Of the Fluidmentioning

confidence: 99%

Modeling the flow deflection characteristics of incompressible fluids in the vortex chamber and analysis of its influencing parameters

Liu

Cao

Han

et al. 2023

Preprint

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“…The thermal relevant performance for all quantitative streamlines was carried out. Liang et al 19 carried out an investigation on nozzle number, cold cone angle, materials, and structural parameters of the vortex tube. They compared cold cone angle, vortex tube materials, inlet presser, and the number of nozzles.…”

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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“…The vortex tube (VOTU) is a particularly mechanical refrigeration unit, where temperature separation is a unique phenomenon in the production of hot and cold air streams [1]. The compressed gas enters the vortex chamber through one or more nozzles, the gas rotates at high speed and, due to the energy separation effect, the hot gas flow flows out from the hot end control valve, the cold gas flow flows in the opposite direction of the hot gas flow through the cold end tube and the cold end control valve [2].…”

Section: Introductionmentioning

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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Experimental investigation on improving the energy separation efficiency of vortex tube by optimizing the structure of vortex generator

Cited by 25 publications

References 36 publications

Modeling the flow deflection characteristics of incompressible fluids in the vortex chamber and analysis of its influencing parameters

Modeling the flow deflection characteristics of incompressible fluids in the vortex chamber and analysis of its influencing parameters

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

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

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