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An efficient approach for discrete particles coupled with the continuous fluid based on unstructured meshes is developed by reorganizing gas phase governing equations. The bubble formation caused by a single central jet pulse in a two-dimensional Pulsed Fluidized Bed (PFB) is simulated. The calculation results show good agreement with the experimental observations. Then our work concentrates on the study of the microscopic structures of two PFBs with different width. Pressure drop pulse and force chain breaks to overcome the inter-particle locking are found just as the jet starts. The simulations show that the gas flows in the bed experience from two-main-vortices to multi-vortices then to two-secondary-vortices. Particles in the bed demonstrate three types of characterized behaviors, i.e., raising, downslide along the bubble's boundary, and creeping motion in the corner.
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Keywords:
- discrete particle /
- pulsed fluidized bed /
- bubble /
- force chain
[1] Kuipers J A M, Prins W, van Swaaij W P M 1991 Chem. Eng. Sci. 46 2881
[2] Kuipers J A M, van Duin K J, van Beckum F P H, van Swaaij W P M 1993 Comput. Chem. Eng. 17 839
[3] Gidaspow D 1994 Multiphase Flow and Fluidization: Continuum and Kinetic Theory Descriptions (London: Academic Press) p157
[4] Nieuwland J J, Veenendaal M L, Kuipers J A M, van Swaaij W P M 1996 Chem. Eng. Sci. 51 4087
[5] Wu C L, Zhan J M, Li Y S, Lam K S 2006 Chem. Eng. Sci. 61 5726
[6] Bokkers G A, van Sint Annaland M, Kuipers J A M 2004 Powder Technol. 140 176
[7] Sun Q C, Wang G Q 2008 Acta Phys. Sin. 57 4667(in Chinese) [孙其诚、王光谦 2008 物理学报 57 4667]
[8] Zhao Y Z, Cheng Y 2008 Acta Phys. Sin. 57 322 (in Chinese) [赵永志、程 易 2008 物理学报 57 322]
[9] Zhao Y Z, Jiang M Q, Xu P, Zheng J Y 2009 Acta Phys. Sin. 58 1819 (in Chinese) [赵永志、江茂强、徐 平、郑津洋 2009 物理学报 58 1819]
[10] Yi C H, Mu Q S, Miao T D 2009 Acta Phys. Sin. 58 7750 (in Chinese) [宜晨虹、慕青松、苗天德 2009 物理学报 58 7750]
[11] Crowe C T 2006 Multiphase Flow Handbook (Florida: CRC Press) p12—54
[12] Wu C L, Berrouk A S, Nandakumar K 2009 Chem. Eng. J. 152 514
[13] Bokkers G A 2005 Ph. D. Dissertation (Enschede: Twente University)
[14] Sun Q C, Wang G Q 2009 Introduction to the Mechanics of Granular Material (Beijing: Science Press) p77 (in Chinese) [孙其诚、王光谦 2009 颗粒物质力学导论 (北京:科学出版社) 第77页]
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[1] Kuipers J A M, Prins W, van Swaaij W P M 1991 Chem. Eng. Sci. 46 2881
[2] Kuipers J A M, van Duin K J, van Beckum F P H, van Swaaij W P M 1993 Comput. Chem. Eng. 17 839
[3] Gidaspow D 1994 Multiphase Flow and Fluidization: Continuum and Kinetic Theory Descriptions (London: Academic Press) p157
[4] Nieuwland J J, Veenendaal M L, Kuipers J A M, van Swaaij W P M 1996 Chem. Eng. Sci. 51 4087
[5] Wu C L, Zhan J M, Li Y S, Lam K S 2006 Chem. Eng. Sci. 61 5726
[6] Bokkers G A, van Sint Annaland M, Kuipers J A M 2004 Powder Technol. 140 176
[7] Sun Q C, Wang G Q 2008 Acta Phys. Sin. 57 4667(in Chinese) [孙其诚、王光谦 2008 物理学报 57 4667]
[8] Zhao Y Z, Cheng Y 2008 Acta Phys. Sin. 57 322 (in Chinese) [赵永志、程 易 2008 物理学报 57 322]
[9] Zhao Y Z, Jiang M Q, Xu P, Zheng J Y 2009 Acta Phys. Sin. 58 1819 (in Chinese) [赵永志、江茂强、徐 平、郑津洋 2009 物理学报 58 1819]
[10] Yi C H, Mu Q S, Miao T D 2009 Acta Phys. Sin. 58 7750 (in Chinese) [宜晨虹、慕青松、苗天德 2009 物理学报 58 7750]
[11] Crowe C T 2006 Multiphase Flow Handbook (Florida: CRC Press) p12—54
[12] Wu C L, Berrouk A S, Nandakumar K 2009 Chem. Eng. J. 152 514
[13] Bokkers G A 2005 Ph. D. Dissertation (Enschede: Twente University)
[14] Sun Q C, Wang G Q 2009 Introduction to the Mechanics of Granular Material (Beijing: Science Press) p77 (in Chinese) [孙其诚、王光谦 2009 颗粒物质力学导论 (北京:科学出版社) 第77页]
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