CFD Analysis of Energy Separation in Ranque-Hilsch Vortex Tube at Cryogenic Temperature

Dutta, T.; Sinhamahapatra, K. P.; Bandyopadhyay, Syamalendu S.

doi:10.1155/2013/562027

Cited by 22 publications

(9 citation statements)

References 28 publications

(39 reference statements)

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“…The velocity field and energy characteristics of the tornado-like vortex have not been clarified enough. Related to flow and energy characteristics of tornado-like vortex are similar to those in the Ranque-Hilsch vortex tube (Ranque, 1933;Hilsch, 1947;Kurosaka, 2006;Eiamsa and Promvonge, 2008;Behera, Paul, Dinesh, and Jacob, 2008;Secchiaroli, Ricci, Montelpare, and Alessandro, 2009;Dutta, Sinhamahapatra, and Bandyopadhyay, 2013).…”

Section: Introductionmentioning

confidence: 75%

Numerical Investigation on Temperature and Flow Characteristics of a Tornado-Like Vortex by using Large-Eddy Simulation

Xiang

et al. 2018

JAFM

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The present work is about numerical simulations of the tornado-like vortex flow generated by our group based on LES techniques which is executed on a three-dimensional computational grid and results have been compared with experimental ones. Different subgrid-scale stress model and finite volume method are adopted to solve the low Mach number compressible Navier-Stokes equations using the different computational domain and boundary conditions, which are mainly to assess the model feasibility. All the simulations were performed using ANSYS FLUENT14.5 in consistency with the real experimental model which avoided the performances of the different techniques and turbulence models introducing other variables. Numerical results suggest that the vacuum degree, temperature difference and the rotation strength decayed in the axial and radial direction regularly changed with inlet gauge pressure p0 from 100 to 400 kPa which are consistent with experimental results. The accurate numerical simulation of this specific flow, resulting in an improved prediction capability of the flow and thermal properties of tornado-like vortex, could allow a correct estimation of the vacuum and energy separating performance of this device in strong rotating jet operation. Furthermore, computational results illustrate that strong rotating jet turbulent flow under the conditions of the certain pressure, temperature, velocity profiles and distribution can formed tornados-like vortex evolution and maintaining mechanism due to a large gradient in radial temperature, pressure and velocity balanced by inertia force, centrifugal force and rotational kinetic energy dissipation.

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Section: Introductionmentioning

confidence: 75%

Numerical Investigation on Temperature and Flow Characteristics of a Tornado-Like Vortex by using Large-Eddy Simulation

Xiang

et al. 2018

JAFM

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“…At this time, the fluid inside drops to a lower temperature by losing momentum greater than the received thermal energy, and becomes a low-temperature flow with temperature lower than the inlet temperature; this air is discharged to the outside through the low-temperature outlet orifice. Figures 1 and 2 clearly show the phenomenon of this vortex tube [26]. What is shown in the vertical direction in Figure 1 is a visual representation of the force magnitude in the vortex tangent direction.…”

Section: Of 23mentioning

confidence: 88%

A Study on the Application Possibility of the Vehicle Air Conditioning System Using Vortex Tube

Kim

Han

2020

Energies

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Since refrigerants applied to vehicle air conditioning systems exacerbate global warming, many studies have been conducted to supplement them. However, most studies have attempted to maximize the efficiency and minimize the environmental impact of the refrigerant, and thus, an air conditioning system without refrigerant is required. The vortex tube is a temperature separation system capable of separating air at low and high temperatures using compressed air. When applied to an air conditioning system, it is possible to construct an eco-friendly system that does not use a refrigerant. In this paper, various temperature changes and characteristics of a vortex tube were identified and applied to an air conditioning system simulation device. Additionally, an air conditioning system simulation device using indirect heat exchange and direct heat exchange methods was constructed to test the low-temperature air flow rate (yc), according to the temperature and pressure. As a result of the experiment, the temperature of the indirect heat exchange method was found to be higher than the direct heat exchange method, but the direct heat exchange method had low flow resistance. As a result, the direct heat exchange method can easily control the temperature according to the pressure and the low-temperature air flow rate (yc). Therefore, it was judged that the direct heat exchange method is more feasible for use in air conditioning systems than the indirect heat exchange method.

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“…2. Inlet conditions for vortex tube were chosen according to the available properties data of nitrogen at cryogenic temperatures [15]. The static pressure at the cold exit boundary was fixed at 2 bar and the static pressure of hot exit boundary was adjusted in the way to vary the cold mass fraction.…”

Section: Cfd Model Of Vortex Tubementioning

confidence: 99%

A novel vortex tube-based N₂-expander liquefaction process for enhancing the energy efficiency of natural gas liquefaction

et al. 2017

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Abstract. This research work unfolds a simple, safe, and environmentfriendly energy efficient novel vortex tube-based natural gas liquefaction process (LNG). A vortex tube was introduced to the popular N2-expander liquefaction process to enhance the liquefaction efficiency. The process structure and condition were modified and optimized to take a potential advantage of the vortex tube on the natural gas liquefaction cycle. Two commercial simulators ANSYS® and Aspen HYSYS® were used to investigate the application of vortex tube in the refrigeration cycle of LNG process. The Computational fluid dynamics (CFD) model was used to simulate the vortex tube with nitrogen (N2) as a working fluid. Subsequently, the results of the CFD model were embedded in the Aspen HYSYS® to validate the proposed LNG liquefaction process. The proposed natural gas liquefaction process was optimized using the knowledge-based optimization (KBO) approach. The overall energy consumption was chosen as an objective function for optimization. The performance of the proposed liquefaction process was compared with the conventional N2-expander liquefaction process. The vortex tube-based LNG process showed a significant improvement of energy efficiency by 20% in comparison with the conventional N2-expander liquefaction process. This high energy efficiency was mainly due to the isentropic expansion of the vortex tube. It turned out that the high energy efficiency of vortex tube-based process is totally dependent on the refrigerant cold fraction, operating conditions as well as refrigerant cycle configurations.

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CFD Analysis of Energy Separation in Ranque-Hilsch Vortex Tube at Cryogenic Temperature

Cited by 22 publications

References 28 publications

Numerical Investigation on Temperature and Flow Characteristics of a Tornado-Like Vortex by using Large-Eddy Simulation

Numerical Investigation on Temperature and Flow Characteristics of a Tornado-Like Vortex by using Large-Eddy Simulation

A Study on the Application Possibility of the Vehicle Air Conditioning System Using Vortex Tube

A novel vortex tube-based N₂-expander liquefaction process for enhancing the energy efficiency of natural gas liquefaction

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CFD Analysis of Energy Separation in Ranque-Hilsch Vortex Tube at Cryogenic Temperature

Cited by 22 publications

References 28 publications

Numerical Investigation on Temperature and Flow Characteristics of a Tornado-Like Vortex by using Large-Eddy Simulation

Numerical Investigation on Temperature and Flow Characteristics of a Tornado-Like Vortex by using Large-Eddy Simulation

A Study on the Application Possibility of the Vehicle Air Conditioning System Using Vortex Tube

A novel vortex tube-based N2-expander liquefaction process for enhancing the energy efficiency of natural gas liquefaction

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A novel vortex tube-based N₂-expander liquefaction process for enhancing the energy efficiency of natural gas liquefaction