CFD modeling and simulation of flows and experienced drag over abnormal-shaped particles, such as sphere, hexahedron, trihedron, cylinder and wheel shapes,were investigated over a range of Reynolds number from 10 to 400. Based on simulation results, the conventional method characterizing an abnormal-shaped particle by using the grain volume or surface area-mean diameters was re-evaluated and was found to be improper in terms of their use in particle drag prediction. Accordingly, a new parameter was defined to take account of the geometrical effects involved and put forword a new correlation of drag coefficients for the above four non-spherical particles. The prediction of drag coefficients was grealty improved.
{{custom_sec.title}}
{{custom_sec.title}}
{{custom_sec.content}}
References
[1]巴切勒 G K. 流体动力学引论[M]. 北京:科学出版社,1997
[2]Peter D, Noymer, Leon R Glicksman, Anand Devendran. Drag on a permeable cylinder in steady flow at moderate Reynolds numbers[J]. Chemical Engineering Science, 1998,53(16):2859-2869
[3]陈甘棠. 化学反应工程[M]. 北京:化学工业出版社, 1981,211
[4]Benkrid K, Rode S, Midoux N. Prediction of pressure drop and liquid saturation in trickle-bed reactors operated in high interaction regimes[J]. Chemical Engineering Science, 1997,52(21/22):4021-4032
[5]赵庆国,廖晖,李绍芬. 气体的温度和压力以及颗粒形状对固定床压降的影响[J]. 化学反应工程与工艺,2000,16(1):1-6
[6]Smirnov W I, Muzykantov A V, Kuzmin V A, et al. Radial heat transfer in cylindrical beds packed by shaped particles[C]. ∥17th International Chemical Reaction Engineering Symposium. Hong Kong: The Hong Kong Polytechnic University, 2002. 25-28
[7]陶文铨. 数值传热学[M]. 西安:西安交通大学出版社,1988,431-439
[8]刘大有. 两相流体动力学[M]. 北京:科学出版社,1993
[9]MacDonald I F, El-Sayed M S, Mow K, Dullien F A L. Flow through porous media: the Ergun equation revisited[J]. Ind Eng Chem Res, 1979, 18: 199-208
{{custom_fnGroup.title_en}}
Footnotes
{{custom_fn.content}}