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Computational fluid dynamics simulation of the flow patterns and performance of conventional and dual-cone gas-particle cyclones | ||
| Journal of Heat and Mass Transfer Research | ||
| مقاله 3، دوره 5، شماره 1 - شماره پیاپی 9، مرداد 2018، صفحه 27-38 اصل مقاله (1.51 M) | ||
| نوع مقاله: Full Length Research Article | ||
| شناسه دیجیتال (DOI): 10.22075/jhmtr.2017.11918.1170 | ||
| نویسندگان | ||
| Seyed Masoud Vahedi؛ Farzad Parvaz* ؛ Roohollah Rafee؛ Mohsen Khandan Bakavoli | ||
| Faculty of Mechanical Engineering, Semnan University, Semnan, Iran | ||
| تاریخ دریافت: 21 تیر 1396، تاریخ بازنگری: 24 شهریور 1396، تاریخ پذیرش: 27 شهریور 1396 | ||
| چکیده | ||
| One of the main concerns of researchers is the separation of suspended particles in a fluid. Accordingly, the current study numerically investigated the effects of a conical section on the flow pattern of a Stairmand cyclone by simulating single-cone and dual-cone cyclones. A turbulence model was used to analyze incompressible gas-particle flow in the cyclone models, and the Eulerian–Lagrangian approach was employed to examine particle movement. Despite the simplicity of cyclone geometry, internal two-phase flow in such devices is very complicated and anisotropic. This flow was therefore analyzed using a Reynolds stress model. The numerical results were then compared with those of experimental studies. To track calcium carbonate particles, drag and gravity forces were considered in the Lagrangian model. The findings indicated that adding a second conical section at the bottom of the cyclones increases tangential velocity and expands the Rankine vortex region. Moreover, an increasing trend of descending flow occurs. Increasing the number of conical sections elevates pressure drop at all velocities. Finally, the dual-cone cyclone has higher efficiency than the typical cyclone because the smaller end of the former limits particle motion and increases collection performance. | ||
| کلیدواژهها | ||
| Eulerian-Lagrangian؛ Reynolds Stress Model؛ turbulent flow؛ Gas-Particle flow | ||
| مراجع | ||
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[1] C.B. Shephered, C.E. Lapple, Flow pattern and pressure drop in cyclone dust collectors, Industrial & Engineering Chemistry, 31(8), 972-984, (1939).
[2] W. Barth, L. Leineweber, Evaluation of design of cyclone separators, Staub Reinhalt. Luft, 24, 41-55, (1964).
[3] H. Mothes, F. Löffler, Prediction of particle removal in cyclone separators, International Journal of Chemical Engineering, 28(2), 231-240, (1988).
[4] D.L. Iozia, D. Leith, The logistic function and cyclone fractional efficiency, Aerosol Science and Technology, 12(3), 598-606, (1990).
[5] A. Avci, I. Karagoz, Effects of flow and geometrical parameters on the collection efficiency in cyclone separators, Journal of Aerosol Science, 34(7), 937-955, (2003).
[6] W. Barth, Berechnung und auslegung von zyklonabscheidern auf grund neuerer untersuchungen, Brennstoff-Wärme-Kraft, 8(1), 1-9, (1956).
[7] E. Muschelknautz, W. Krambrock, Aerodynamische Beiwerte des Zyklonabscheiders aufgrund neuer und verbesserter Messungen, Chemie Ingenieur Technik, 42(5), 247-255, (1970).
[8] P. Meißner, F. Löffler, Zur berechnung des strömungsfeldes im zyklonabscheider, Chemie Ingenieur Technik, 50(6), 451-471, (1978).
[9] I. Karagoz, A. Avci, Modelling of the pressure drop in tangential inlet cyclone separators. Aerosol Science and Technology, 39(9), 857-865, (2005).
[10] A.C. Hoffmann, M. De Groot, W. Peng, H.W.A. Dries, J. Kater, Advantages and risks in increasing cyclone separator length, AIChE journal, 47(11), 2452-2460, (2001).
[11] Y. Zhu, K.W. Lee, Experimental study on small cyclones operating at high flowrates. Journal of Aerosol Science, 30(10), 1303-1315, (1999).
[12] F. Kaya, I. Karagoz, A. Avci, Effects of surface roughness on the performance of tangential inlet cyclone separators. Aerosol science and technology, 45(8), 988-995, (2011).
[13] B. Wang, D.L. Xu, K.W. Chu, A.B. Yu, Numerical study of gas–solid flow in a cyclone separator. Applied Mathematical Modelling, 30(11), 1326-1342, (2006).
[14] L. Shi, D.J. Bayless, Comparison of boundary conditions for predicting the collection efficiency of cyclones. Powder Technology, 173(1), 29-37, (2007).
[15] A. Raoufi, M. Shams, M. Farzaneh, R. Ebrahimi, Numerical simulation and optimization of fluid flow in cyclone vortex finder. Chemical Engineering and Processing: Process Intensification, 47(1), 128-137, (2008).
[16] A. Kępa, Division of outlet flow in a cyclone vortex finder—The CFD calculations. Separation and Purification Technology, 75(2), 127-131, (2010).
[17] K. Elsayed, C. Lacor, The effect of cyclone inlet dimensions on the flow pattern and performance, Applied Mathematical Modelling, 35(4), 1952–1968, (2011).
[18] B. Zhao, Y. Su, J. Zhang, Simulation of Gas Flow Pattern and Separation Efficiency in Cyclone with Conventional Single and Spiral Double Inlet Configuration, Chemical Engineering Research and Design, 84(12), 1158–1165, (2006).
[19] T. G. Chuah, J. Gimbun, T. S. Y. Choong, A CFD study of the effect of cone dimensions on sampling aerocyclones performance and hydrodynamics, Powder Technology, 162, 126–132, (2006).
[20] R. Xiang, S. H. Park, K. W. Lee, Effects of cone dimension on cyclone performance, Journal of Aerosol Science, 32(4), 549–561, (2001). [21] F. Kaya, I. Karagoz, Numerical investigation of performance characteristics of a cyclone prolonged with a dipleg, Chemical Engineering Journal, 151(1), 39–45, (2009). [22] F. Qian, J. Zhang, M. Zhang, Effects of the prolonged vertical tube on the separation performance of a cyclone, Journal of hazardous materials, 136, 822–829, (2006).
[23] H. Yoshida, Y. Nishimura, K. Fukui, T. Yamamoto, Effect of apex cone shape on fine particle classification of gas-cyclone, Powder Technology, 204(1), 54–62, (2010).
[24] A.J. Hoekstra, Gas flow field and collection efficiency of cyclone separators, Ph.D. thesis, Technical University Delft, Netherland, (2000).
[25] F. Parvaz, S.H. Hosseini, G. Ahmadi, Kh. Elsayed, Impacts of the Vortex Finder Eccentricity on the Flow Pattern and Performance of a Gas Cyclone, Separation and Purification Technology, 187, 1-13, (2017).
[26] B. Zhao, Development of a new method for evaluating cyclone efficiency, Chemical Engineering and Processing: Process Intensification, 44, 447–451 (2005).
[27] J. Gimbun, CFD simulation of aerocyclone hydrodynamics and performance at extreme temperature, Engineering Applications of Computational Fluid Mechanics, 2(1), 22-29 (2008).
[28] Y. Su, A.Zheng, B. Zhao, Numerical simulation of effect of inlet configuration on square cyclone separator performance, Powder technology, 210(3), 293-303 (2011).
[29] N. Fathizadeh, A. Mohebbi, S. Soltaninejad, M. Iranmanesh, Design and simulation of high pressure cyclones for a gas city gate station using semi-empirical models, genetic algorithm and computational fluid dynamics. Journal of Natural Gas Science and Engineering, 26, 313-329 (2015).
[30] L.S. Brar, R.P. Sharma, K. Elsayed, The effect of the cyclone length on the performance of Stairmand high-efficiency cyclone, Powder Technology, 286, 668-677 (2015).
[31] X. Gao, J. Chen, J. Feng, X. Peng, Numerical investigation of the effects of the central channel on the flow field in an oil–gas cyclone separator, Computers & Fluids, 92, 45-55 (2014).
[32] Ansys FLUENT 16 user guide. , Fluent Inc., 2006.
[33] A. C. Hoffmann and L. E. Stein. Gas cyclones and swirl tubes: Principle, Design and Operation. Springer, 2nd edition, 2008.
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