The effect of convergent-divergent tube on the cooling capacity of vortex tube: An experimental and numerical study

Zangana, Lizan Mahmood Khorsheed; Barwari, Ramzi Raphael Ibraheem

doi:10.1016/j.aej.2019.12.036

Cited by 18 publications

(5 citation statements)

References 14 publications

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“…A numerical and experimental study of the convergent-divergent vortex tube by Zangana and Barwari (2020) showed that the cooling rate can be improved by convergent-divergent vortex tube. Thakare and Parekh (2017) observed the influence of insulation on the performance of vortex tube and experimental data was utilized to develop a CFD model.…”

Section: Vortex Tube Design and Industrial Applicationsmentioning

confidence: 99%

Experimental and CFD Analysis on the Effect of Various Cold Orifice Diameters and Inlet Pressure of a Vortex Tube

Bagre

Parekh

Patel

2023

JAFM

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An experimental investigation was conducted to investigate the effects of different cold orifice diameters and operating pressures of the vortex tube. A vortex tube test rig was employed to conduct the experiments for various cold orifice diameters and operating pressures. Cold orifice diameters range from 1 mm to 6 mm, whereas the pressure condition ranges from 2 to 5 bar. The vortex generators were made up of brass material having six inlet nozzles. It was found that the temperature separation of the vortex tube significantly depends on the cold orifice diameter of the vortex tube and operating pressure. The study demonstrates the deviation of cold temperature separation with respect to the cold orifice diameters and inlet pressure for different cold mass fractions. In addition, present experimental results are used to determine the optimum cold orifice diameter, which is 5 mm at 5 bar inlet pressure. The percentage improvement in average cold temperature separation for 5 mm cold orifice diameter is 66.18% compared to rest of the cold orifice diameters at an inlet pressure of 5 bar. The maximum cooling power separation is 0.08 kW at 0.3 cold mass fraction and inlet pressure of 5 bar. The CFD technique was approached to discuss the complex fluid flow inside the tube at various radial distances. A three-dimensional numerical study was done and validated with the present experimental work. It was found that the numerical results are in good agreement with the present experimental data.

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Section: Vortex Tube Design and Industrial Applicationsmentioning

confidence: 99%

Experimental and CFD Analysis on the Effect of Various Cold Orifice Diameters and Inlet Pressure of a Vortex Tube

Bagre

Parekh

Patel

2023

JAFM

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“…The convergent-divergent type RHVT working with ideal compressed air ( Figure 38) with (6) inlet nozzles is analyzed computationally by L. Zangana and R. Barwari (2020) [19] using the standard K-Ɛ turbulence model in the FLUENT software and validated experimentally considering the constant inlet pressure and cold flow mass fraction, by comparing the results with a traditional VT type, the case is estimated as steady-state and an adiabatic with the neglection of the frictional effect, the minimum cold temperature flow location of the VT is analyzed with the variation of the throttling diameter size from (2.5-3.5) mm. The results indicated that the minimum throat size achieved the minimum cold temperature to be in the cold exit location, also the convergent-divergent VT utilization resulted in more temperature drop in the cold flow and created a higher hot flow pressure which is drawn to the hot exit region (Figures 39 a and b).…”

Section: The Vortex Tube Shape Configurationmentioning

confidence: 99%

“…39. The convergent-divergent RHVT [19] The effect of variation in the contraction linear slope angle from (0-9) in the convergent type RHVT (Figure 40) has been investigated numerically and experimentally by S. Rafiee, M. Sadeghiazad, and N. Mostafavinia (2015) [20] as a combination factor with the VT cold flow orifice size variation from (8-9.5 mm) defining the inlet and outlet boundary conditions on pressure-based values, the finite volume solution approach in the numerical simulation is adopted.…”

Section: The Vortex Tube Shape Configurationmentioning

confidence: 99%

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A review on the vortex tube geometrical affecting paramters

Abdulhussain

2020

Journal of Mechanical and Energy Engineering

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One of the increased usability energy separation devices that deals with compressed fluids such as the air, the water, and several Refrigerants are the Ranque-Hilsch vortex tube due to its simple operating principle to separate the compressed fluid to two hot and cold streams. The aim of the current paper is to review the Ranque-Hilsch tube flow separation most affecting geometrical parameters influencing the thermal separation efficiency in the literature that are conducted numerically and experimentally such as the number of injection nozzles and their cross-sectional shape including the rectangular and the trapezoidal for straight constant and converged nozzle profiles as well as the helical swept nozzle configurations like the nozzles aspect and the convergence ratios, the variation of the helical profile pitch angle with the increase in the nozzles number is also considered in the survey, further geometrical parameters survey is performed that includes the vortex tube orifice size to the nozzle's length dimensional ratio and also the vortex tube configuration like the divergent and the convergent/divergent vortex tube shapes characteristics that includes the divergent angle and the throttling zone size in addition to the vortex tube length to the hot exit port size ratio and the optimum conical valve shape position and tapering angle.

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“…The vortex tube is the second expansion device that is able to produce the hot and cold streams simultaneously. The vortex tube was invented in 1933, and since then, it has been used as a cooling device and gas-type separation [16] and it has been analyzed experimentally [17][18][19] and numerically [20][21][22]. The vortex tube as an expansion valve was introduced in [1,4,5,23,24].…”

Section: Introductionmentioning

confidence: 99%

Exergy Efficiency and COP Improvement of a CO2 Transcritical Heat Pump System by Replacing an Expansion Valve with a Tesla Turbine

2022

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The heat pump system has been widely used in residential and commercial applications due to its attractive advantages of high energy efficiency, reliability, and environmental impact. The massive exergy loss during the isenthalpic process in the expansion valve is a major drawback of the heat pump system. Therefore, the Tesla turbine exergy analysis in terms of transiting exergy efficiency is investigated and integrated with the transcritical heat pump system. The aim is to investigate the factors that reduce exergy losses and increase the coefficient of performance and exergy efficiency. The contribution of this paper is twofold. First, a three-dimensional numerical analysis of the supercritical CO2 flow simulation in the Tesla turbine in three different geometries is carried out. Second, the effect of the Tesla turbine on the coefficient of performance and exergy efficiency of the heat pump system is investigated. The effect of the rotor speed and disk spacing on the Tesla turbine power, exergy loss, and transiting exergy efficiency is investigated. The results showed that at a lower disk spacing, the turbine produces higher specific power and transiting exergy efficiency. In addition, the coefficient of performance (COP) and exergy efficiency improvement in the heat pump system combined with the Tesla turbine are 9.8% and 28.9% higher than in the conventional transcritical heat pump system, respectively.

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The effect of convergent-divergent tube on the cooling capacity of vortex tube: An experimental and numerical study

Cited by 18 publications

References 14 publications

Experimental and CFD Analysis on the Effect of Various Cold Orifice Diameters and Inlet Pressure of a Vortex Tube

Experimental and CFD Analysis on the Effect of Various Cold Orifice Diameters and Inlet Pressure of a Vortex Tube

A review on the vortex tube geometrical affecting paramters

Exergy Efficiency and COP Improvement of a CO2 Transcritical Heat Pump System by Replacing an Expansion Valve with a Tesla Turbine

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