Experimental and CFD analysis on thermal performance of Double-Circuit vortex tube (DCVT)-geometrical optimization, energy transfer and flow structural analysis

Rafiee, Seyed Ehsan; Mohammadkhani, Farzad

doi:10.1016/j.applthermaleng.2017.09.112

Cited by 20 publications

(3 citation statements)

References 75 publications

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“…Investigation of open literature found [14][15][16] , Standard turbulence model better reflects the energy separation characteristics of the vortex tube and the distribution of the internal pressure field, temperature field, velocity field, so the Standard turbulence model is used for the numerical simulation of the vortex tube. The numerical simulation uses ideal air as the working gas, the pressure solver, the flow equations are chosen to discretize the control equations in the second-order windward format, and the SIMPLEC algorithm is chosen to calculate the pressure-velocity coupling.…”

Section: Figure5grid Independence Verificationmentioning

confidence: 99%

“…The numerical simulation uses ideal air as the working gas, the pressure solver, the flow equations are chosen to discretize the control equations in the second-order windward format, and the SIMPLEC algorithm is chosen to calculate the pressure-velocity coupling. Standard Theoretical equations related to turbulence modeling are [16] :…”

Section: Figure5grid Independence Verificationmentioning

confidence: 99%

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Analysis of the influence of pipe materials on the energy separation effect of vortex tubes

Han,

Huang

2024

Preprint

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The basic objective of studying vortex tubes using CFD simulations is to improve efficiency and performance by selecting the right material for manufacturing vortex tubes under suitable conditions. In this paper, numerical simulations are carried out to analyze the counter flow vortex tube with different materials. Compressed air is used as the work mass with an inlet pressure of 0.1mpa to 0.5mpa and the materials used are copper, aluminum, steel, PVC, and wood. The cold mass fraction was kept at 0.1, and the L/D of the vortex tube was taken as 16. The Standard k-ε model was used to perform steady-state numerical simulations of the gas flow inside the vortex tube, and the trends of velocity, pressure, and temperature variations under different materials, pressures, and roughness conditions were obtained. Finally, after evaluating all the simulated values for the properties of the five materials, depending on their physical properties, the vortex tube as a metallic material has a higher temperature gradient than the non-metallic materials in the order from copper - aluminum - steel - PVC - wood.

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Section: Figure5grid Independence Verificationmentioning

confidence: 99%

Section: Figure5grid Independence Verificationmentioning

confidence: 99%

Analysis of the influence of pipe materials on the energy separation effect of vortex tubes

Han,

Huang

2024

Preprint

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“…Nayak et al performed a computational approach to investigate the effect of working condition and geometric features on its performance. Rafiee and Sadeghiazad presented an experimental and CFD analysis of double‐circuit VT geometrical optimization and observed the energy transfer and flow structure within it. Bazgir et al performed various experimental and computational investigations to optimize cooling performance.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of the energy separation effect and flow mechanism inside convergent, straight, and divergent double‐sleeve RHVT

Bazgir

Heydari

Bazooyar

et al. 2019

Heat Trans. Asian Res.

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This study provides analysis of a cooled Ranque-Hilsch vortex tube (RHVT) with various specifications. It shows how cooling influences energy conversion inside the RHVT and improves performance of the device in separation of hot gas from the cold stream within the fluid by presenting the temperature detachment (the temperature diminution of cold air (ΔT c = T i − T c ), isentropic efficiency (η is ), and coefficient of performance (COP) of divergent, convergent, and straight VTs. Two key parameters including hot tube length and number of nozzles for cooling and insulated cases are investigated to find out how the performance of the VT is affected by different geometry configurations under cooling conditions. These influences were researched for straight, convergent, and divergent VT separators under different flow characteristics. The optimum geometrical conditions for the cooling cases were identified. Results are indicative of positive influence of cooling for energy separation inside a VT. The quantities of ΔT c , η is , and COP for the cooled RHVT are greater than uncooled RHVT for various types of VTs. Cooling the VTs leads to an increase of 12.5% in ΔT c , 14.4% in η is , and 15.1% in COP when the base case was an uncooled VT.Thermal design and management of vortex tube (VT) has emerged as one of the most efficient cooling strategies for refrigeration and air conditioning systems. VTs are simple stationary devices for separation of the gaseous components of a pressurized mixture without consuming any specific works or energy. 1 Figure 1 is a schematic of energy separation within a VT. Due to its low cost, compactness, mobility, quietness, environmentally friendly operation, and the fact that they do no need any input work, VTs are beginning to replace the inefficient, energy consuming, useless machines in a variety of industrial applications where cooling, separation, and depressurizing issues are desired. 2 A desirable application for VTs for the purpose of depressurizing can be continued in the natural gas transmission industry. The pressure of gas pipelines near the customers need to be reduced to a working level, which is devoid of any danger and hazards. Conventional throttling valves for this aim would reduce pressure and the temperature of gas simultaneously resulting in exergy destruction and entropy generation. A VT can successfully play the role of a depressurizer in a more energy-efficient manner. 3 The energy separation through the VT, namely Ranque-Hilsch effect, is an important subject of matter in the archival literature. Many different numerical and experimental techniques were used to analyze the performance of VTs with different geometries under various flow conditions. The summary of main experimental works pointing at designing VTs is reported by Behera et al 4 and Yilmaz et al. 5 Sharma et al 6 presented a review on computational methods used by various literature to comprehend the energy separation and optimize the device and brought suggestions for improving the performance of the dev...

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

Liang

Tang

Chun

et al. 2021

Applied Thermal Engineering

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Experimental and CFD analysis on thermal performance of Double-Circuit vortex tube (DCVT)-geometrical optimization, energy transfer and flow structural analysis

Cited by 20 publications

References 75 publications

Analysis of the influence of pipe materials on the energy separation effect of vortex tubes

Analysis of the influence of pipe materials on the energy separation effect of vortex tubes

Numerical investigation of the energy separation effect and flow mechanism inside convergent, straight, and divergent double‐sleeve RHVT

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

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