Sanjeevi Sathish K P, Padding Johan T
Process and Energy Department Delft University of Technology Delft The Netherlands.
AIChE J. 2020 Jun;66(6):e16951. doi: 10.1002/aic.16951. Epub 2020 Feb 25.
We investigate the average drag, lift, and torque on static assemblies of capsule-like particles of aspect ratio 4. The performed simulations are from Stokes flow to high Reynolds numbers (0.1 ≤ Re ≤ 1,000) at different solids volume fraction (0.1 ≤ ≤ 0.5). Individual particle forces as a function of the incident angle with respect to the average flow are scattered. However, the average particle force as a function of is found to be independent of mutual particle orientations for all but the highest volume fractions. On average, a sine-squared scaling of drag and sine-cosine scaling of lift holds for static multiparticle systems of elongated particles. For a packed bed, our findings can be utilized to compute the pressure drop with knowledge of the particle-orientation distribution, and the average particle drag at = 0° and 90°. We propose closures for average forces to be used in Euler-Lagrange simulations of particles of aspect ratio 4.
我们研究了长径比为4的胶囊状颗粒静态组件上的平均阻力、升力和扭矩。所进行的模拟涵盖了从斯托克斯流到不同固体体积分数（0.1≤≤0.5）下的高雷诺数（0.1≤Re≤1000）情况。单个颗粒的力作为相对于平均流的入射角的函数呈离散分布。然而，除了最高体积分数外，发现平均颗粒力作为的函数与颗粒间的相互取向无关。对于细长颗粒的静态多颗粒系统，平均而言，阻力的正弦平方标度和升力的正弦余弦标度成立。对于填充床，我们的研究结果可用于在已知颗粒取向分布以及=0°和90°时的平均颗粒阻力的情况下计算压降。我们提出了用于长径比为4的颗粒的欧拉 - 拉格朗日模拟中的平均力封闭形式。
