Numerical simulation of secondary vortex chamber effect on the cooling capacity enhancement of vortex tube

Pourmahmoud, Nader; Azar, Farid Sepehrian; Hassanzadeh, Amir

doi:10.1007/s00231-014-1335-z

Cited by 13 publications

(10 citation statements)

References 16 publications

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“…They have been established to make reasonably well for an enormous domain of wall-bounded and free shear streams. As shown in the above equations, several factors and constants have a large influence on the standard k-ɛ turbulence model [1,3]. These factors are shown in table 2.…”

Section: Numerical Modeling and Governing Equationsmentioning

confidence: 96%

“…He observed an emits of cold air from one side and, hot air from another side George J. Ranque [2]. The vortex tube has many applications such as personal air conditioning, cutting tools shrink fitting, cooling of gas turbine rotor blades, cooling electrical cabinets, cooling of some equipment such as sewing needles, cooling of hot operations [3]. Vortex tube was desolated for many years until a German engineer Rudolf Hilsch revived the interesting of this device, who wrote the results of his theoretical studies and comprehensive experimental which led to improving the efficiency of the vortex tube R. Hilsch [4].…”

Section: Introductionmentioning

confidence: 99%

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Experimental study and CFD analysis of energy separation in a counter flow vortex tube

Khorsheed

Ibraheem

2021

THERM SCI

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In this manuscript, both experimental and numerical investigations have been carried out to study the mechanism of separation energy and flow phenomena in the counter flow vortex tube. This manuscript presents a complete comparison between the experimental investigation and CFD analysis. The experimental model was manufactured with (total length of 104 mm and the inner diameter of 8 mm, and made of cast iron) tested under different inlet pressures (4, 5 and 6 bar). The thermal performance has been studied for hot and cold outlet temperature as a function of mass fraction α (0.3-0.8). Three-dimensional numerical modeling using the k-ε model used with code (Fluent 6.3.26). Two types of velocity components are studied (axial and swirl). The results show any increase in both cold mass fraction and inlet pressure caused to increase ΔTc, and the maximum ΔTc value occurs at P = 6 bar. The coefficient of performance (COP) of two important factors in the vortex tube which are a heat pump and a refrigerator have been evaluated, which ranged from 0.25 to 0.74. A different axial location (Z/L = 0.2, 0.5, and 0.8) was modeled to evaluate swirl velocity and radial profiles, where the swirl velocity has the highest value. The maximum axial velocity is 93, where it occurs at the tube axis close to the inlet exit (Z/L=0.2). The results showed a good agreement for experimental and numerical analysis.

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Section: Numerical Modeling and Governing Equationsmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Experimental study and CFD analysis of energy separation in a counter flow vortex tube

Khorsheed

Ibraheem

2021

THERM SCI

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“…They also introduced a new parameter named GPL (nozzle inlet gap per length of nozzle) to design this kind of nozzles. Pourmahmoud et al [21] investigated secondary vortex chamber effect on the cooling capacity enhancement of vortex tube. Also Pourmahmoud et al [22] investigated numerically the inlet pressure effects on the energy separation in a vortex tube with convergent nozzles and one vortex chamber.…”

Section: Figure 1 Schematic Drawing Of a Vortex Tubementioning

confidence: 99%

Numerical Simulation of Effect of Shell Heat Transfer on the Vortex Tube Performance

Pourmahmoud¹,

Abbaszadeh²,

Rashidzadeh³

2016

IJHT

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Since, cooling is the main use of vortex tube, the exited heat from the hot outlet of vortex tube can be assumed as the wasted energy when it is used as a cooling device. So, this paper tries to reduce the hot and cold temperatures at exhausts in order to increase the vortex tube cooling power. In this paper, a new method is studied which uses the shell heat transfer mechanism to affect the flow pattern inside the vortex tube. This research tries to clarify the flow pattern inside the vortex tube applying a fixed negative heat flux on the wall of the vortex tube. The results indicate that a part of main tube (around 23%) can be introduced as the effective cooling length.

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“…It was concluded that irreversibility increases with an increase in the inlet pressure. Pourmahmoud et al (2014) investigated secondary vortex chamber effect on the cooling capacity of vortex tube and showed that Z = 5 mm is a critical place for locating second chamber to have maximum cooling effect. More designing parameters such as tube length and its geometry, cold and hot exit area, number of nozzles and the nozzles types can govern on the flow field behaviour in a vortex tube with one chamber.…”

Section: Figure 1 Schematic Drawing Of a Counter Flow Vortex Tubementioning

confidence: 99%

Entropy and exergy analysis of a Ranque-Hilsch vortex tube with two vortex chambers

Sepehrianazar

Khalilarya

2016

IJEX

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Abstract:In this paper, entropy and exergy of a vortex tube with two vortex chambers is studied. Computational fluid dynamics (CFD) analysis of a three-dimensional, steady state, compressible and turbulent flow is carried out through a vortex tube. The standard k-turbulence model is used to analyse highly rotating complex flow field. The entropy, inlet and outlet exergies, destruction of exergy and exergy efficiency are studied. Results show that for different inlet pressures, there is an optimum distance for placing second chamber to have maximum exergy efficiency. Placing second chamber at the axial interval of Z = 1.5-5 mm leads to have minimum cold temperature, maximum hot temperature and maximum exergy efficiency, in comparison with one chamber.

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Numerical simulation of secondary vortex chamber effect on the cooling capacity enhancement of vortex tube

Cited by 13 publications

References 16 publications

Experimental study and CFD analysis of energy separation in a counter flow vortex tube

Experimental study and CFD analysis of energy separation in a counter flow vortex tube

Numerical Simulation of Effect of Shell Heat Transfer on the Vortex Tube Performance

Entropy and exergy analysis of a Ranque-Hilsch vortex tube with two vortex chambers

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