CIESC Journal ›› 2019, Vol. 70 ›› Issue (5): 1702-1712.doi: 10.11949/j.issn.0438-1157.20180962

• Fluid dynamics and transport phenomena • Previous Articles     Next Articles

Verification of coarse-grained CFD-DEM method in multiple flow regimes

Junjie LIN(),Kun LUO(),Shuai WANG,Chenshu HU,Jianren FAN   

  1. State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, Zhejiang, China
  • Received:2018-08-27 Revised:2019-02-22 Online:2019-05-05 Published:2019-05-10
  • Contact: Kun LUO E-mail:linjunjie@zju.edu.cn;zjulk@zju.edu.cn

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Abstract:

The computation load for traditional computational fluid dynamics-discrete element method (CFD-DEM) simulations tremendously increases when the number of particles augments in the system. The coarse-grained CFD-DEM method, in which a number of real particles are lumped into a numerical parcel, can remarkably reduce the computation load. It is necessary to extensively verify the coarse-grained CFD-DEM method before it is applied. Therefore, in the current work, the coarse-grained CFD-DEM method is validated in fluidized beds with various fluidization regimes. On one hand, it is found that gas and solid features (i.e., void fraction, pressure signals, and particle velocity) obtained from this method match well with the experiment measurements. On the other hand, as the coarse-grained ratios increase, the calculation time for a specific case is significantly reduced. In summary, the coarse-grained CFD-DEM contributes a great improvement of calculation efficiency while a little loss of numerical accuracy, which is expected to be a powerful tool to simulate gas-solid flow dynamics in large-scale dense particulate systems.

Key words: coarse-grained method, DEM, CFD, fluidized bed, gas-solid flow, computational efficiency

CLC Number: 

  • TQ 018

Fig.1

Experimental setup of bubbling fluidized bed adopted in simulation"

Table 1

Physical properties and parameters(bubbling fluidized bed)"

Parameter Value
particle diameter/mm 3.256
particle density/(kg?m-3) 1131
original number of particles 95000
restitution coefficient 0.97
friction coefficient 0.35
collision spring constant/(N?m-1) 800
parcel diameter of CGP-k1.5/mm 4.884
parcel number of CGP-k1.5 28148
parcel diameter of CGP-k2/mm 6.512
parcel number of CGP-k2 11875
fluid density/(kg?m-3) 1.205
dynamic viscosity/(Pa·s) 1.8 × 10-5
superficial velocity/(m?s-1) 2.1

Fig.2

Transient distribution of particle velocity in bubbling fluidized bed simulated by traditional and coarse-grained CFD-DEM"

Fig.3

Time-averaged distribution of bubbling fluidized bed"

Fig.4

Comparison of pressure drop and frequency spectrum in bubbling fluidized bed"

Fig.5

Comparison of calculation time with different methods in bubbling fluidized bed"

Fig.6

Schematic diagram of spouting fluidized bed used in present simulation"

Table 2

Physical properties and parameters(spouting fluidized bed)"

Parameter Value
particle diameter/mm 4.04
particle density/(kg?m-3) 2526
original number of particles 44800
restitution coefficient 0.97
friction coefficient 0.33
collision spring constant/(N?m-1) 800
parcel diameter of CGP-k1.5/mm 6.06
parcel number of CGP-k1.5 13274
parcel diameter of CGP-k2/mm 8.08
parcel number of CGP-k2 5600
fluid density/(kg?m-3) 1.205
dynamic viscosity/(Pa·s) 1.8 × 10-5
spouting velocity/(m?s-1) 65
background velocity/(m?s-1) 3.5

Fig.7

Transient distribution of particle velocity in spouting fluidized bed simulated by traditional and coarse-grained CFD-DEM"

Fig.8

Time-averaged gas-solid properties in spouting fluidized bed"

Fig.9

Particle vertical velocity in spouting fluidized bed measured with different methods"

Fig.10

Comparison of calculation time with different methods in spouting fluidized bed"

Fig.11

Sketch of 3-D circulating fluidized bed and grid of calculation domain"

Fig.12

Distributions of time-averaged solid holdup at different height of slices x = 0 and y = 0 of riser"

Fig.13

Full-loop distribution of pressure in CFB with time-averaged properties"

1 Erkiaga A , Lopez G , Amutio M , et al . Influence of operating conditions on the steam gasification of biomass in a conical spouted bed reactor[J]. Chemical Engineering Journal, 2014, 237:259-267.
2 Li T , Zhang Y , Grace J R , et al . Numerical investigation of gas mixing in gas-solid fluidized beds[J]. AIChE Journal, 2010, 56(9):2280-2296.
3 Braga M B , Wang Z , Grace J R , et al . Slot-rectangular spouted bed: hydrodynamic stability and effects of operating conditions on drying performance[J]. Drying Technology, 2015, 33(2):216-226.
4 Amirjan M , Khorsand H , Khorasani M . Fluidized bed coating efficiency and morphology of coatings for producing Al-based nanocomposite hollow spheres[J]. International Journal of Minerals, Metallurgy, and Materials, 2014, 21(11):1146-1151.
5 周池楼, 赵永志 . 离散单元法及其在流态化领域的应用 [J]. 化工学报, 2014, 65(7): 2520-2534.
Zhou C L , Zhao Y Z . Discrete element method and its applications in fluidization[J]. CIESC Journal, 2014, 65(7):2520-2534.
6 Zhang K , Luo K , Fan J R . TFM and DEM numerical simulation of bubbling fluidized bed with uniform gas inlet [J]. Journal of Engineering Thermophysics, 2011, 32(12): 2076-2079.
7 Sun L Y , Luo K , Fan J R . Numerical investigation on methanation kinetic and flow behavior in full-loop fluidized bed reactor [J]. Fuel, 2018, 231: 85-93.
8 Sun L Y , Luo K , Fan J R . Production of synthetic natural gas by CO methanation over Ni/Al2O3 catalyst in fluidized bed reactor [J]. Catal. Commun., 2018, 105: 37-42.
9 Sun L Y , Luo K , Fan J R . Numerical study on flow behavior of ultrafine powders in conical spouted bed with coarse particles[J]. Chemical Engineering Research and Design, 2017, 125 :461-470.
10 Wang Q G , Feng Y Q , Lu J F , et al . Numerical study of particle segregation in a coal beneficiation fluidized bed by a TFM-DEM hybrid model: influence of coal particle size and density[J]. Chemical Engineering Journal, 2015, 260:240-257.
11 万晓涛, 郑雨, 魏飞, 等 . 循环流化床提升管气固湍流的计算流体力学模拟——k-ε-k p-ε p-Θ 5参数双流体模型 [J]. 化工学报, 2002, 53(5): 461-468.
Wan X T , Zheng Y , Wei F , et al .Numerical simulation of gas-solid turbulent flow in riser reactor——k-ε-k p-ε p-Θ two-phase flow model[J]. Journal of Chemical Industry and Engineering (China), 2002, 53(5): 461-468.
12 Wang S , Luo K , HU C S , et al . CFD-DEM study of the effect of cyclone arrangements on the gas-solid flow dynamics in the full-loop circulating fluidized bed [J]. Chemical Engineering Science, 2017, 172: 199-215.
13 Luo K , Wang S , Yang S L , et al . Computational fluid dynamics-discrete element method investigation of pressure signals and solid back-mixing in a full-loop circulating fluidized bed [J]. Industrial & Engineering Chemistry Research, 2017, 56(3): 799-813.
14 Yang S L , Luo K , Fan J R , et al . Particle-scale investigation of the solid dispersion and residence properties in a 3-D spout-fluid bed [J]. AIChE Journal, 2014, 60(8): 2788-2804.
15 Yang S L , Sun Y H , Wang J W , et al . Influence of operating parameters and flow regime on solid dispersion behavior in a gas-solid spout-fluid bed[J]. Chemical Engineering Science, 2016, 142:112-125.
16 Wang S , Luo K , Yang S , et al . Parallel LES-DEM simulation of dense flows in fluidized beds[J]. Applied Thermal Engineering, 2017, 111: 1523-1535.
17 Tsuji Y , Kawaguchi T , Tanaka T . Discrete particle simulation of two-dimensional fluidized bed[J]. Powder Technology, 1993, 77(1): 79-87.
18 Washino K , Hsu C H , Kawaguchi T , et al . Similarity model for DEM simulation of fluidized bed[J]. Journal of the Society of Powder Technology, 2007, 44(3): 198-205.
19 Sakai M , Abe M , Shigeto Y , et al . Verification and validation of a coarse grain model of the DEM in a bubbling fluidized bed[J]. Chemical Engineering Journal, 2014, 244:33-43.
20 Sakai M , Yamada Y , Shigeto Y , et al . Large-scale discrete element modeling in a fluidized bed[J]. International Journal for Numerical Methods in Fluids, 2010, 64(10/11/12):1319-1335.
21 Lu L Q , Benyahia S , Li T . An efficient and reliable predictive method for fluidized bed simulation[J]. AIChE Journal, 2017, 63(12): 5320-5334.
22 Yang S L , Cahyadi A , Sun Y , et al . CFD-DEM investigation into the scaling up of spout-fluid beds via two interconnected chambers [J]. AIChE Journal, 2016, 62(6): 1898-1916.
23 Yang S L , Cahyadi A , Wang J , et al . DEM study of granular flow characteristics in the active and passive regions of a three-dimensional rotating drum [J]. AIChE Journal, 2016, 62(11): 3874-3888.
24 Yang S L , Luo K , Qiu K , et al . Coupled computational fluid dynamics and discrete element method study of the solid dispersion behavior in an internally circulating fluidized bed [J]. Industrial & Engineering Chemistry Research, 2014, 53(16): 6759-6772.
25 Yang S L , Luo K , Fang M , et al . Discrete element study of solid mixing behavior with temperature difference in three-dimensional bubbling fluidized bed [J]. Industrial & Engineering Chemistry Research, 2014, 53(17): 7043-7055.
26 Hu C S , Luo K , Yang S L , et al . A comprehensive numerical investigation on the hydrodynamics and erosion characteristics in a pressurized fluidized bed with dense immersed tube bundles [J]. Chemical Engineering Science, 2016, 153: 129-145.
27 Smagorinsky J . General circulation experiments with the primitive equations [J]. Monthly Weather Review, 1963, 91(3): 99-164.
28 Gidaspow D . Multiphase Flow and Fluidization: Continuum and Kinetic Theory Descriptions[M]. New York：Academic Press, 1994.
29 Lu B , Wang W , Li J . Eulerian simulation of gas-solid flows with particles of Geldart groups A, B and D using EMMS-based meso-scale model[J]. Chemical Engineering Science, 2011, 66(20): 4624-4635.
30 Lu L Q , Xu J , Ge W , et al . EMMS-based discrete particle method (EMMS-DPM) for simulation of gas-solid flows[J]. Chemical Engineering Science, 2014, 120:67-87.
31 Gopalan B , Shahnam M , Panday R , et al . Measurements of pressure drop and particle velocity in a pseudo 2-D rectangular bed with Geldart group D particles[J]. Powder Technology, 2016, 291: 299-310.
32 Luo K , Yang S L , Fang M M , et al . LES-DEM investigation of the solid transportation mechanism in a 3-D bubbling fluidized bed（I）: Hydrodynamics [J]. Powder Technology, 2014, 256: 385-394.
33 Link J M , Deen N G , Kuipers J A M , et al . PEPT and discrete particle simulation study of spout‐fluid bed regimes[J]. AIChE Journal, 2008, 54(5): 1189-1202.
34 Yang S L , Luo K , Fang M M , et al . Influences of operating parameters on the hydrodynamics of a 3-D spout-fluid bed based on DEM modeling approach [J]. Chemical Engineering Journal, 2014, 247: 161-173.
35 Wang S , Luo K , Hu C S , et al . Effect of superficial gas velocity on solid behaviors in a full-loop CFB [J]. Powder Technology, 2018, 333: 91-105.
36 Luo K , Wu F , Yang S L , et al . High-fidelity simulation of the 3-D full-loop gas-solid flow characteristics in the circulating fluidized bed [J]. Chemical Engineering Science, 2015, 123: 22-38.
37 燕兰玲, 蓝兴英, 吴迎亚, 等 . FCC提升管内气体流经颗粒聚团流动特性的模拟研究 [J]. 化学反应工程与工艺, 2014, 30(1): 41-47.
Yan L L , Lan X Y , Wu Y Y , et al . Numerical simulation of flow behavior of gas flowing through clusters in FCC risers [J]. Chemical Reaction Engineering and Technology, 2014, 30(1):41-47.
38 Li J , Cheng C , Zhang Z , et al . The EMMS model — its application, development and updated concepts [J]. Chemical Engineering Science, 1999, 54(22): 5409-5425.
39 陈程, 祁海鹰 . EMMS曳力模型及其颗粒团模型的构建和检验 [J]. 化工学报, 2014, 65(6): 2003-2012.
Chen C , Qi H Y . Development and validation of cluster and EMMS drag model[J]. CIESC Journal, 2014, 65(6): 2003-2012.
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