Experimental and Numerical Study of Dilute Gas-Solid Flow inside a 90° Horizontal Square Pipe Bend
Affiliation(s)
Department of Mechanical Power, Faculty of Energy Engineering, Aswan University, Aswan, Egypt. Upper Egypt Flour Mills Co., Sohag, Egypt.
Department of Mechanical Power, Faculty of Energy Engineering, Aswan University, Aswan, Egypt. Upper Egypt Flour Mills Co., Sohag, Egypt.
ABSTRACT
A pneumatic test rig is built to test a curved 90° square bend in an open-circuit horizontal-to-horizontal suction wind tunnel system. Sand particles are used to represent the solid phase with a wide range of particle diameters. Velocity profiles are constructed by measuring the gas velocity using a 3-hole probe. Flow patterns inside the bend duct are introduced using sparks caused by burning sticks of incense with the air flow inside the piping system for flow visualization purpose. Numerical calculations are performed by Lagrangian-particle tracking model for predicting particle trajectories of dispersed phase, and standard k-ε model for predicting the turbulent gas-solid flows in bends. Comparisons made between the theoretical results and experimental data for the velocity vectors and particle trajectories show good agreement.
A pneumatic test rig is built to test a curved 90° square bend in an open-circuit horizontal-to-horizontal suction wind tunnel system. Sand particles are used to represent the solid phase with a wide range of particle diameters. Velocity profiles are constructed by measuring the gas velocity using a 3-hole probe. Flow patterns inside the bend duct are introduced using sparks caused by burning sticks of incense with the air flow inside the piping system for flow visualization purpose. Numerical calculations are performed by Lagrangian-particle tracking model for predicting particle trajectories of dispersed phase, and standard k-ε model for predicting the turbulent gas-solid flows in bends. Comparisons made between the theoretical results and experimental data for the velocity vectors and particle trajectories show good agreement.
Cite this paper
W. Aissa, T. Mekhail, S. Hassanein and O. Hamdy, "Experimental and Numerical Study of Dilute Gas-Solid Flow inside a 90° Horizontal Square Pipe Bend," Open Journal of Fluid Dynamics, Vol. 3 No. 4, 2013, pp. 331-339. doi: 10.4236/ojfd.2013.34040.
W. Aissa, T. Mekhail, S. Hassanein and O. Hamdy, "Experimental and Numerical Study of Dilute Gas-Solid Flow inside a 90° Horizontal Square Pipe Bend," Open Journal of Fluid Dynamics, Vol. 3 No. 4, 2013, pp. 331-339. doi: 10.4236/ojfd.2013.34040.
References
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[1] G. Sharma, “Direct Numerical Simulation of Particle-Laden Turbulence in a Straight Square Duct,” Master Thesis, Regional Engineering College, Hamirpur, 2004. [2] M. Fairweather and J. Yao, “Large Eddy Simulation of Particle Dispersion in a Straight, Square Duct Flow,” 18th European Symposium on Computer Aided Process Engineering—ESCAPE 18, Computer Aided Chemical Engineering, Lyon, 1-4 June 2008, pp. 829-834. [3] J. A. C. Humphrey, J. H. Whitelaw and G. Yee, “Turbulent Flow in a Square Duct of Strong Curvature,” Journal of Fluid Mechanics, Vol. 103, 1981, pp. 443-463. http://dx.doi.org/10.1017/S0022112081001419 [4] T. A. Mekhail, W. A. Aissa, S. A. Hassanein and O. Hamdy, “CFD Simulation of Dilute Gas-Solid Flow in 90° Square Bend,” Energy and Power Engineering, Vol. 3, No. 3, 2011, pp. 246-252. http://dx.doi.org/10.4236/epe.2011.33031 [5] W. Yang and B. T. Kuan, “Experimental Investigation of Dilute Turbulent Particulate Flow inside a Curved 90° Bend,” Chemical Engineering Science, Vol. 61, No. 11, 2006, pp. 3593-3601. http://dx.doi.org/10.1016/j.ces.2006.01.013 [6] S. Dosanjh and J. A. C. Humphrey, “The Influence of Turbulence on Erosion by a Particle Laden Fluid Jet,” Wear, Vol. 102, No. 4, 1985, pp. 309-330. http://dx.doi.org/10.1016/0043-1648(85)90175-9 [7] R. Mossad, W. Yang and M. P. Schwarz, “Numerical Prediction of Air Flow in a Sharp 90° Elbow,” 7th International Conference on CFD in the Minerals and Process Industries, CSIRO, Melbourne, 9-11 December 2009, pp. 1-5. [8] D. O. Njobuenwu, M. Fairweather and J. Yao, “Prediction of Gas-Solid Flows in a Square Duct with a 90° Bend,” Turbulence, Heat and Mass Transfer, Vol. 6, 2009, pp. 769-772. [9] Y. S. Cheng and C. S. Wang, “Inertial Deposition of Particles in a Bend,” Journal of Aerosol Science, Vol. 6, No. 2, 1975, pp. 139-145. http://dx.doi.org/10.1016/0021-8502(75)90007-5 [10] R. I. Crane and R. L. Evans, “Inertial Deposition of Particles in a Bend Pipe,” Journal of Aerosol Science, Vol. 8, No. 3, 1977, pp. 161-170. http://dx.doi.org/10.1016/0021-8502(77)90003-9 [11] Y. S. Cheng and C. S. Wang “Motion of Particles in Bends of Circular Pipes,” Atmospheric Environment, Vol. 15, No. 3, 1981, pp. 301-306. http://dx.doi.org/10.1016/0004-6981(81)90032-9 [12] A. Keating and S. Nesic, “Prediction of Two-Phase Erosion-Corrosion in Bends,” 2nd International Conference on CFD in the Minerals and Process Industries, CSIRO, Melbourne, 6-8 December 1999, pp. 229-236. [13] C. Ratnayake, “A Comprehensive Scaling up Technique for Pneumatic Transport Systems,” Ph.D. Thesis, The Norwegian University of Science and Technology, Trondheim, 2005. [14] G. M. Faeth, “Mixing, Transport and Combustion in Sprays,” Progress in Energy and Combustion Science, Vol. 13, No. 4, 1987, pp. 293-345. http://dx.doi.org/10.1016/0360-1285(87)90002-5 [15] J. Fan, J. Eves, H. M. Thompson, V. V. Toropov, N. Kapur, D. Copley and A. Mincher, “Computational fluid Dynamic Analysis and Design Optimization of Jet Pumps,” Computers & Fluids, Vol. 46, No. 1, 2001, pp. 212-217. http://dx.doi.org/10.1016/j.compfluid.2010.10.024 [16] “CFXTASC Flow Version 2.9 Theory Documentation,” AEA Technology Engineering Software Limited, Waterloo, N2L 5Z4, 1999.