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Promvonge, Pongjet; Eiamsa-ard, Smith

doi:10.2306/scienceasia1513-1874.2005.31.215

Cited by 62 publications

(9 citation statements)

References 6 publications

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“…Devade and Pise (Devade & Pise, 2014), as shown in Fig.6 obtain the similar results. Similar trend is observed by (Promvonge & Eiamsa-ard, 2005) reported that at lower values of diameter ratio, high backpressure exists, and at higher values of diameter ratio, higher tangential velocities exist. Optimum performance is thus occurs at ⁄ = 0.5.…”

Section: Effect Of Cold Orifice Diameter (Do)supporting

confidence: 88%

“…Saidi and Valipour (Saidi & Valipour, 2003) optimized L/D ratio for best efficiency, and suggested that for achieving higher efficiency, L/D ratio should be in the range of20 ≤ ≤ 55.5 ⁄ . Aydin (Aydin & Baki, 2006) based on the experimental results suggested that L/D20, but the trend of the results obtained is exactly opposite of few researchers (Hilsch, 1947;Promvonge & Eiamsa-ard, 2005;. Cockerill (Cockerill, 1995) experimentally analysed that L/D ratio equal to 60 and 64 produces effective temperature separation.…”

Section: Effect Of L/d Ratiomentioning

confidence: 93%

“…Some of these (Saidi & Valipour, 2003;Kirmaci, 2009;Dincer, Avci, Baskaya, & Berber, 2010;Avci, 2013) have observed the decay in performance with increase in nozzle number, the reason of decay is increase in turbulence of the flow. While few (Promvonge & Eiamsa-ard, 2005;Eiamsa-ard, 2010;Bovand, Rashidi, & Esfahani, 2016) have mentioned that increase in nozzle number enhances the energy separation. The increase in energy separation and drop in cold end temperature occurs because of the intense swirl produced with increasing the number of nozzles.…”

Section: Effect Of Nozzle Number and Nozzle Geometry (Nn)mentioning

confidence: 99%

“…These experimental (Hilsch, 1947;Deemter, 1952;Gulyaev, 1966;Borisenko, Safonov, & Yakovlev, 1968;Saidi & Valipour, 2003;Promvonge & Eiamsa-ard, 2005;Aydin & Baki, 2006;Polisel, Rocha, & Simões-Moreira, 2007;Wu, Ding, Ji, Ma, & Ge, 2007) studies have discussed the effect of cold end diameter (Chang, Li, Zhou, & Qiang, 2011;Valipour & Niazi, 2011;Mohmmadi & Farhadi, 2013;Bovand, Rashidi, & Esfahani, 2016) on energy separation. Some studies (Nimbalkar & Muller, 2009) have reported that secondary circulation occurs because of cold orifice dimensions.…”

Section: Effect Of Cold Orifice Diameter (Do)mentioning

confidence: 99%

“…In these cascade is re-introduction of the hot flow as inlet to another vortex tube, some of the researches have tried insulation and cooling with water jacket, while detwister is used on hot end to guide the flow axially reducing losses. Among this insulated tube (Promvonge & Eiamsa-ard, 2005) has shown rise in performance by 5%, while cooling on hot tube (Eiamsa-ard, Wongcharee, & Promvonge, 2010) has shown 4.7 to 9% enhancement in cooling efficiency. Detwister improves heating by 3 to 5 0 .…”

Section: Effect Of Hot End Valves/plug/cones (θ)mentioning

confidence: 99%

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Parametric Review of Ranque-Hilsch Vortex Tube

Devade¹,

Pise²

2017

AJHMT

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Vortex tube is the device that separates pressurized fluid into hot and cold fluid streams simultaneously. The scientific community has done extensive experimental and theoretical studies since invention of vortex tube to augment the performance of the tube by varying geometrical and operational parameters; the paper deals with parametric review of all such work. The review takes into account effect of almost 14 parameters on performance of vortex tube. It includes developments in tube geometry like L/D ratio, number of nozzles; hot end valve angle and cold orifice diameter etc. are discussed along with different fluids and operational parameters like CMF and stagnation point etc. The focus of most of the theoretical and experimental studies was to investigate mechanism of thermal separation and geometry optimization. The main objective of this review is to discuss efforts made in order to enhance the refrigeration effect so that, missing links could help for future research.

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Section: Effect Of Cold Orifice Diameter (Do)supporting

confidence: 88%

Section: Effect Of L/d Ratiomentioning

confidence: 93%

Section: Effect Of Nozzle Number and Nozzle Geometry (Nn)mentioning

confidence: 99%

Section: Effect Of Cold Orifice Diameter (Do)mentioning

confidence: 99%

Section: Effect Of Hot End Valves/plug/cones (θ)mentioning

confidence: 99%

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Parametric Review of Ranque-Hilsch Vortex Tube

Devade¹,

Pise²

2017

AJHMT

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Issues and prospects of energy separation in vortex tubes: Review

Devade¹,

Pise²

2017

Heat Trans. Asian Res.

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A vortex tube is a device that separates entering compressed fluid into hot and cold fluid streams simultaneously. This energy separation phenomenon inside the tube is a mystery and the mechanism that causes heat transfer needs attention. Since the invention of the vortex tube, the scientific community has taken efforts to search for energy separation mechanisms. Performance augmentation and the physics of energy separation was the objective of many experimental studies. The performance of the vortex tube varies with changes in geometric and operational parameters. Most of the theoretical studies addressed the issue of energy separation. Prospects and issues of energy separation in a vortex tube in view of the literature is the core of this paper. The main objective is to discuss efforts made in order to justify the physics and to identify new areas for research.

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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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Untitled

Cited by 62 publications

References 6 publications

Parametric Review of Ranque-Hilsch Vortex Tube

Parametric Review of Ranque-Hilsch Vortex Tube

Issues and prospects of energy separation in vortex tubes: Review

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

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