Discrete element method–computational fluid dynamics analyses of flexible fibre fluidization
Discrete element method–computational fluid dynamics analyses of flexible fibre fluidization
复制标题
离散元法——柔性纤维流化的计算流体动力学分析
DOI：
10.1017/jfm.2020.930
复制
发表时间：
2021-01
影响因子：
3.7
通讯作者：
Jennifer S. Curtis
中科院分区：
文献类型：
--
作者：
Yiyang Jiang;Yu Guo;Zhaosheng Yu;Xia Hua;Jianzhong Lin;Carl R. Wassgren;Jennifer S. Curtis
本文用离散元法和计算流体力学耦合的方法研究了以前很少研究的柔性纤维气体流化床。在本数值方法中，通过计算纤维中每个组成元件的相互作用力来模拟气体-纤维相互作用，并且组成元件上的相互作用力的合成在纤维上产生合成的流体动力和合成的流体动力扭矩。压力降和纤维取向从目前的模拟结果与不同的纤维长径比。与以前的实验和模拟结果吻合良好。对于纤维的柔性效应，得到了一些新的结果。纤维上的较大流体动力（在床被流化之前）和较小的最小流化速度（MFVs）被观察到。更灵活的纤维床由于较小的孔隙率，而较小的流体动力。获得更灵活的纤维时，床被流化与显着的纤维运动。通过使用MFV缩放表观气体速度，压降数据可以崩溃到各种纵横比的刚性纤维的Ergun相关性;然而，对于非常柔性的纤维，压降曲线偏离Ergun相关性，在达到MFV之前显著的纤维床膨胀。due.to纤维的长径比和柔韧性都对固体混合速率有影响，发现固体混合速率基本上由表观气速与MFV的比值决定。
Gas-fluidized beds of flexible fibres, which have been rarely studied before, are.investigated in this work using the coupled approach of the discrete element method and.computational fluid dynamics. In the present numerical method, gas–fibre interaction is.modelled by calculating the interaction force for each constituent element in the fibre, and.the composition of the interaction forces on the constituent elements generates a resultant.hydrodynamic force and a resultant hydrodynamic torque on the fibre. Pressure drops and.fibre orientation results from the present simulations with various fibre aspect ratios are in.good agreement with previous experimental and simulation results. Some novel results are.obtained for the effects of fibre flexibility. Larger hydrodynamic forces on fibres (before.the bed is fluidized) and smaller minimum fluidization velocities (MFVs) are observed for.more flexible fibre beds due to the smaller porosities, while smaller hydrodynamic forces.are obtained for the more flexible fibres when the beds are fluidized with significant fibre.motion. By scaling the superficial gas velocity using the MFVs, the data of pressure drop.can collapse onto the Ergun correlation for stiff fibres of various aspect ratios; however,.the pressure drop curves deviate from the Ergun correlation for very flexible fibres, due.to the significant fibre bed expansion before the MFV is reached. The fibre aspect ratio.and flexibility both have an impact on the solids mixing rate, and it is found that the solids.mixing rates are essentially determined by the ratio of the superficial gas velocity to MFV.
登录
查看更多内容
影响因子：
3.7
作者：
J. Gan;Zongyan Zhou;A. Yu
通讯作者：
J. Gan;Zongyan Zhou;A. Yu
DOI：
10.1002/aic.15854
发表时间：
2017-12
期刊：
AIChE journal. American Institute of Chemical Engineers
影响因子：
--
作者：
Buist KA;Jayaprakash P;Kuipers JAM;Deen NG;Padding JT
通讯作者：
Padding JT
DOI：
10.1063/1.4983046
发表时间：
2017-05
期刊：
The Review of scientific instruments
影响因子：
--
作者：
D. Parker
通讯作者：
D. Parker
影响因子：
5.2
作者：
Hoelzer, Andreas;Sommerfeld, Martin
通讯作者：
Sommerfeld, Martin
影响因子：
3.8
作者：
Jie Cai;Xiao-bao Zhao;Qihe Li;Zhulin Yuan
通讯作者：
Jie Cai;Xiao-bao Zhao;Qihe Li;Zhulin Yuan