Investigating the second law of thermodynamics and three-dimensional flow study within the vortex tube device using computational fluid dynamics

Document Type : Article

Authors

Department of Mechanical Engineering, Urmia University, Urmia, Iran

Abstract

In this paper, the effect of inlet pressure on the performance of vortex tube device has been investigated using 3D simulation and CFD technique by Fluent software. The flow inside the device is considered as compressible and turbulent. In order to understand and investigate the effect of inlet pressure, different inlet pressures are entered into the device and the results are extracted and analyzed. The main goal is to achieve the minimum cold exit temperature and maximum swirl velocity in the vortex tube. This paper indicates that inlet pressure of 4.8 bars is an optimal inlet pressure which is justifiable economically and also in terms of the amount of produced cooling. The CFD results show that increase in inlet pressure, increases the entropy production and subsequently the system disorder. Finally, the existing gaps in the previous studies will be filled by examining the inlet and exit exergies in the vortex tube device. Inlet exergy has not considerable changes in terms of α and have a constant value and at α=0.3691 the minimum exergy efficiency is occurred according to the calculations.

Keywords

Main Subjects


References
[1]   Pourmahmoud, N., Sepehrian Azar, F. and Hassanzadeh, A. “Numerical simulation of secondary vortex chamber effect on the cooling capacity enhancement of vortex tube”, Heat Mass Transfer, 50(9), pp. 1225-1236, (2014).
[2]   Pourmahmoud, N., Esmaily, R. and Hassanzadeh, A. “Experimental investigation of diameter of cold end orifice effect in vortex tube”, J. of Thermophys. and Heat Transfer, 29(3), pp. 629-633, (2015).
[3]   Ghafouri, A. and Hassanzadeh, A. “Numerical simulation of motion and deformation of healthy and sick red blood cell through a constricted vessel using hybrid lattice Boltzmann-immersed boundary method”, J. the Brazilian Soc. of Mech. Sci. and Eng., 39(6), pp. 1873–1882, 2017.
[4]   Pourmahmoud, N., Jahangiramini, A., Hassanzadeh A. and Izady, A. “Numerical investigation of energy separation in a low pressure vortex tube under different axial angles of injection nozzles” (In Persian), Modarres Tech. and Eng. Sci. Res. J., 13(7), pp. 64-73, (2013).
[5]   Khodayari Bavil, A. and Razavi, S.E. “On the thermo flow behavior in a rectangular channel with skewed circular ribs”, Mech. & Ind., 18(2), 225, (2017).
[6]   Khosravi, M., Mosaddeghi, F., Oveisi, M. and khodayari bavil, A. “Aerodynamic drag reduction of heavy vehicles using append devices by CFD analysis”, J. Cent. South Univ. 22, pp. 4645-4652, (2015).
[7]   Mohammadi, B., Rohanifar, M., Salimi-Majd, D. and Farrokhabadi, A. “Micromechanical prediction of damage due to transverse ply cracking under fatigue loading in composite laminates”, J. Reinforced Plast. and Compos., 36(5), pp. 377-395, (2017).
[8]   Pourmahmoud, N., Hassanzadeh, A., Motaby, O. and Bramo, A. “Computational fluid dynamics analysis of helical nozzles effect on the energy separation in a vortex tube”, Therm. Sci., 16(1), pp. 151-166, (2012).
[9]   Ranque, G.J. “Experiences Sur la Détente Giratoire Avec Simultanes d’un Echappement d’air Chaud et d’un Enchappement d’air Froid”, J. Phys. Radium, 4, pp. 112–114, (1933).
[10]           Hilsch, R. “Die Expansion Von Gasen im Zentrifugalfeld als Kälteproze”, Z. Naturforschung, 1, pp. 208–214, (1946).
[11]           Khazaei, H., Teymourtash, A.R. and Malek-Jafarian, M. “Effects of gas properties and geometrical parameters on performance of a vortex tube”, Scientia Iranica, 19(3), pp. 454-462, (2012).
[12]           Dawoodian, M., Dadvand, A. and Hassanzadeh, A. “A numerical and experimental study of the aerodynamics and stability of a horizontal parachute”, ISRN Aerospace Engineering, (2013), Article ID 320563, 8 pages.
[13]           Pourmahmoud, N., Rafiee, E., Rahimi, M. and Hassanzadeh, A. “Numerical energy separation analysis on the commercial Ranque-Hilsch vortex tube on basis of application of different gases”, Scientia Iranica, 20(5), pp. 1528-1537, (2013).
[14]           Behera, U., Paul, P.J., Kasthurirengen, S., Karunanithi, R., Ram, S.N., Dinesh, K. and Jacob, S. “CFD analysis and experimental investigations towards optimizing the parameters of Ranque– Hilsch vortex tube”, Int. J. Heat Mass Transfer, 48, pp. 1961–1973, (2005).
[15]           Shamsoddini, R. and HosseinNezhad, A. “Numerical analysis of the effects of nozzles number on the flow and power of cooling of a vortex tube”, Int. J. Refrigeration, 33, pp. 774-782, (2010).
[16]           Pourmahmoud, N., Izady, A., Hassanzadeh, A. and Jahangiramini, A. “Computational fluid dynamics analysis of the influence of injection nozzle lateral outflow on the performance of Ranque-Hilsch vortex tube”, Therm. Sci., 18(4), pp. 1191-1201, (2014).
[17]           Pourmahmoud, N., Esmaily, R. and Hassanzadeh, A. “CFD investigation of vortex tube length effects as a designing criterion”, Int. J. of Heat and Tech., 32(1), pp. 129-136, (2015).
[18]           Ameri, M. and Behnia, B. “The study of key design parameters effects on the vortex tube performance”, J. Therm. Sci., 4, pp. 370−376, (2009).
[19]           Zhidkov, M.A., Komarova, G.A., Gusev A.P. and Iskhakov, R.M. “Interrelation between the separation and thermodynamic characteristics of three-flow vortex tubes”, Chem. Petro. Eng., 37, pp. 271-277, (2001).
[20]           Skye, H.M., Nellis G.F. and Klein, S.A. “Comparison of CFD analysis to empirical data in a commercial vortex tube”, Int. J. Refrig., 29, pp. 71–80, (2006).
[21]           Pourmahmoud, N., Rashidzadeh, M. and Hassanzadeh, A. “CFD investigation of inlet pressure effects on the energy separation in a vortex tube with convergent nozzles”, Eng. Comput., 32(5), pp. 1323-1342, (2015).
Pourmahmoud, N., Izadi, A., Hassanzadeh, A., and Jahangiramini A. “Computational fluid dynamics analysis of the influence of injection nozzle lateral outflow on the performance of Ranque-Hilsch vortex tube”, Therm. Sci., 18(4), pp. 1191-1201, (2014).