An experimental study on the design parameters of a counterflow vortex tube

Aydın, Orhan; Baki, Muzaffer

doi:10.1016/j.energy.2005.11.017

Cited by 162 publications

(69 citation statements)

References 27 publications

(31 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The design of the swirl inlet was based on the work of Aydin and Baki [36], who used a similar design for counter flow vortex tubes to compare the effect of different inlet angles on swirl flow. The design used in this study was checked for swirl intensity by using a computational fluid dynamics model before it was manufactured.…”

Section: Swirl Inletmentioning

confidence: 99%

Inlet flow effects in micro-channels in the laminar and transitional regimes on single-phase heat transfer coefficients and friction factors

Dirker

Meyer

Garach

2014

International Journal of Heat and Mass Transfer

View full text Add to dashboard Cite

An experimental investigation of heat transfer and pressure drop in rectangular micro-channels was conducted for water in the laminar and transitional regimes for three different inlet configurations.The inlet types under consideration were the sudden contraction, bellmouth, and swirl inlet types, and hydraulic diameters of 0.57 mm, 0.85 mm, and 1.05 mm were covered. It was found that the critical Reynolds number and the transitional behaviour in terms of heat transfer coefficients and friction factors were influences significantly by the inlet type. For the sudden contraction inlet type, which were investigated for both adiabatic, as well as diabatic cases, adiabatic friction factors were predicted well by the laminar Shah and London correlation, while diabatic friction factors were decreased with an increase in wall heat flux. The sudden contraction inlet critical Reynolds numbers were found to be between 1 800 and 2 000 for adiabatic cases, while for diabatic cases the transition regime commenced at a Reynolds number of about 2 000. The bellmouth and swirl inlet types were investigated for diabatic cases only with swirl inlet tests limited to the 1.05 mm channel. Laminar 2 friction factors were approximately similar to those of the sudden contraction inlet type, however, after the commencement of transition both inlet types exhibited higher friction factors than the sudden contraction inlet. Minor transition occurred as early as at Reynolds numbers of 1 200 and 800 for the bellmouth and swirl inlet types respectively while major transition occurred at Reynolds numbers of approximately 1 800 and 1 500 respectively. Critical Reynolds numbers were found not be significantly influenced by the channel to diameter to length ratio considered in this study. Laminar Nusselt numbers were predicted well by conventional macro-channel thermal entry correlations. The swirl inlet type exhibited the highest friction factors and Nusselt numbers in the transitional regime followed by the bellmouth inlet type. During transition while compared with the sudden contraction inlet, both the bellmouth and swirl inlet types exhibited larger enhancement in heat transfer than increases in the friction factor penalty. Based on the experimental data obtained in this study, a set of correlations were developed which describes the relation between the friction factor and Colburn jfactor. Depending on the inlet type, the correlations predicted between 94% and 100% of the results to within 10% of the experimental measurements.

show abstract

Section: Swirl Inletmentioning

confidence: 99%

Inlet flow effects in micro-channels in the laminar and transitional regimes on single-phase heat transfer coefficients and friction factors

Dirker

Meyer

Garach

2014

International Journal of Heat and Mass Transfer

View full text Add to dashboard Cite

show abstract

“…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: 92%

“…In addition, it is not possible to keep L/D constant and predict changes; hence, effect of change in L/D ratio becomes a useful parameter. These experimental studies (Gulyaev, 1966;Dyskin, 1989;Saidi & Allaf Yazdi, 1999;Aydin & Baki, 2006;Saidi & Valipour, 2003;Polisel, Rocha, & Simões-Moreira, 2007) Gulyaev (Gulyaev, 1966) suggested that L/D > 13 for increasing energy separation. Dyskin (Dyskin, 1989) incorporated detwister on cold end side, and proved that length of tube decreases for optimum performance using detwister.…”

Section: Effect Of L/d Ratiomentioning

confidence: 97%

“…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%

“…Figure 10 shows the various valve angles researchers used during analysis. Many researchers during their experimental studies (Marshall, 1977;Dyskin, 1989;Aydin & Baki, 2006;Dincer, Baskaya, Uysal, & Ucgul, 2009;Markal, Aydin, & Avci, 2010;Dincer, Yilmaz, Berber, & Baskaya, 2011;Devade & Pise, 2012;Im & Yu, 2012;Avci, 2013;Devade & Pise, 2014) have used different valves Bovand, Rashidi, & Esfahani, 2016) and shapes. Dyskin (Dyskin, 1989) used detwister on hot end and observed that the heating effect increase by 3 to5 0 .…”

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

confidence: 99%

See 2 more Smart Citations

Parametric Review of Ranque-Hilsch Vortex Tube

Devade¹,

Pise²

2017

AJHMT

View full text Add to dashboard Cite

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.

show abstract

Machine learning‐assisted analysis and prediction for the thermal effect of various working fluids in a vortex tube

Wang,

Li,

Zhong

et al. 2023

Asia-Pacific J Chem Eng

View full text Add to dashboard Cite

With the widespread application of vortex tube in various fields, it becomes essential to quantitatively explore the separation effect of different fluids (natural fluids, hydrocarbons, etc.) within the vortex tube and to promote its utilization. A new approach has been developed in this study to establish quantitative models for predicting the thermal effects of different fluids in a vortex tube. These models are based on both the macro properties of the working fluid and micro molecular descriptor through a molecular scale. A dataset of 11 numerical simulation results of hydrocarbons and hydrofluorocarbons refrigerants is employed. Three operating conditions, 10 property parameters, and 115 molecular descriptors are screened and identified using random forest feature analysis. Two types of models (micro and macro) have been developed by employing artificial neural network (ANN) modeling techniques. In the result, four key influencing fluid property parameters (the specific heat ratio γ, the multiplication of heat capacity and the molar weight cp·M, the kinematic viscosity ν, and the thermal conductivity λ) and nine molecular descriptors in affecting the thermal effect are identified and respectively chosen as the input in the macro and the micro ANN model establishment. Both types of developed models show a high correlation coefficient (R > .999) and a comparatively low mean square error (MSE). When R600 is employed in the validation, most of the relative error is less than 10%, suggesting both types of models can work effectively in predicting the thermal effect for other fluid. The findings contribute to a deeper understanding of the thermodynamic effect of vortex tubes and provide a valuable tool for selecting and optimizing working fluids in various applications.

show abstract

An experimental study on the design parameters of a counterflow vortex tube

Cited by 162 publications

References 27 publications

Inlet flow effects in micro-channels in the laminar and transitional regimes on single-phase heat transfer coefficients and friction factors

Inlet flow effects in micro-channels in the laminar and transitional regimes on single-phase heat transfer coefficients and friction factors

Parametric Review of Ranque-Hilsch Vortex Tube

Machine learning‐assisted analysis and prediction for the thermal effect of various working fluids in a vortex tube

Contact Info

Product

Resources

About