Investigation of the thermal separation in a counter-flow Ranque-Hilsch vortex tube with regard to different fin geometries located inside the cold-tube length

Bazgir, Adib; Heydari, Ali; Nabhani, Nader

doi:10.1016/j.icheatmasstransfer.2019.104273

Cited by 23 publications

(7 citation statements)

References 53 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The optimum taper angle for the best flow separation is the (0) degree, when this degree is increased the secondary circulated flow will be faded in RHVT resulting in a poor flow separation process. The incorporation of various-shaped contraction zones at the VT near the cone exit valve is conducted computationally by A. Bazgir, A. Heyderi and N. Nabhani (2019) [17] using the RNG K-Ɛ turbulence model. With the adoption of circular, parallelogram, rectangular, square, trapezoidal and triangle smooth contraction (Figures 34 a-f), these contraction zones will produce stagnation flow points that increased the flow temperature profile is increased highly for the parallelogram contraction shape and the lowest in the rectangular contraction.…”

Section: The Vortex Tube Shape Configurationmentioning

confidence: 99%

“…With the adoption of circular, parallelogram, rectangular, square, trapezoidal and triangle smooth contraction (Figures 34 a-f), these contraction zones will produce stagnation flow points that increased the flow temperature profile is increased highly for the parallelogram contraction shape and the lowest in the rectangular contraction. One of the most frequently investigated parameters that have been thoroughly studied by the researchers is the ratio of the VT length to its size (L/D) for various profiles shapes, F. P. Branco, E. D. Buchelt, F. M. Barbosa, B. P. Rosa, and D. J. Laporte (2018) [18] has examined this parameter change experimentally on the thermal energy separation efficiency for a VT (Figure 35) with variable (L/D) ratio between (12)(13)(14)(15)(16)(17)(18) for two assigned values of the VT internal diameter of (1/4 and 3/8 inch), respectively when the compressed air with various inlet pressure range from (1-2.5) bar is separated thermally within the VT. Fig. 35.…”

Section: The Vortex Tube Shape Configurationmentioning

confidence: 99%

“…The contraction zone shapes: a) circular, b) parallelogram, c) rectangular, d) square, e) trapezoidal, f) triangle[17] …”

mentioning

confidence: 99%

See 2 more Smart Citations

A review on the vortex tube geometrical affecting paramters

Abdulhussain

2020

Journal of Mechanical and Energy Engineering

View full text Add to dashboard Cite

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.

show abstract

Section: The Vortex Tube Shape Configurationmentioning

confidence: 99%

Section: The Vortex Tube Shape Configurationmentioning

confidence: 99%

See 1 more Smart Citation

A review on the vortex tube geometrical affecting paramters

Abdulhussain

2020

Journal of Mechanical and Energy Engineering

View full text Add to dashboard Cite

show abstract

“…Khait et al 11 proposed flow formation with a transonic nozzle designed; explained the energy separation and energy efficiency process by supersonic speed; the transonic nozzle reduces energy loss and improved the energy efficiency of VT; disadvantages of the transonic nozzle are, encapsulated by the advantages. Bazgir et al 12 proposed a novel work on counter flow RHVT with 3D numerical value; used fins inside the cold tube at study state condition; geometry of fins with triangle square, rectangle, circle parallelogram, and trapezium, etc. Summarized results were established on the COP, isentropic efficiency, the temperature difference was recorded at maximum with parallelogram and minimum with rectangle fins.…”

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

View full text Add to dashboard Cite

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.

show abstract

“…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. Table gives the most important CFD research activities that have been done to evaluate the performance of VTs and to increase the knowledge about this industrially desirable device.…”

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.

Self Cite

View full text Add to dashboard Cite

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...

show abstract

Investigation of the thermal separation in a counter-flow Ranque-Hilsch vortex tube with regard to different fin geometries located inside the cold-tube length

Cited by 23 publications

References 53 publications

A review on the vortex tube geometrical affecting paramters

A review on the vortex tube geometrical affecting paramters

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

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

Contact Info

Product

Resources

About