A new model for settling velocity of non-spherical particles
A new model for settling velocity of non-spherical particles
复制标题
非球形颗粒沉降速度的新模型
DOI：
10.1007/s11356-021-14880-9
复制
发表时间：
2021-03
影响因子：
5.8
通讯作者：
Huai Wenxin
中科院分区：
文献类型：
--
作者：
Yang Fan;Zeng Yuhong;Huai Wenxin
在河流生态系统中，经常观察到非球形颗粒的沉降，如植物繁殖体和自然沉积物。沉降过程受颗粒特性(大小、密度和形状)和流体特性(密度和粘度)的影响。因此，非球形颗粒的阻力定律是颗粒雷诺数和颗粒形状的函数。其中，共收集了828个沉降数据，涵盖了广泛的颗粒雷诺数范围(10000-0.008)。为了表征颗粒形状的影响，采用球度作为综合形状因子，其变化范围为0.421~1。通过将测量的阻力与球体的标准阻力曲线进行比较，我们用三个形状相关函数对球形阻力定律进行了修正，得到了非球形颗粒的阻力新定律。结合迭代过程，得到了预测各种形状、不同材料的非球形颗粒沉降速度的新模型。在深入了解沉降过程的基础上，展望了其在水孔扩散和泥沙输送方面的进一步应用。
The settlement of non-spherical particles, such as propagules of plants and natural sediments, is commonly observed in riverine ecosystems. The settling process is influenced by both particle properties (size, density, and shape) and fluid properties (density and viscosity). Therefore, the drag law of non-spherical particles is a function of both particle Reynolds number and particle shape. Herein, a total of 828 settling data are collected from the literatures, which cover a wide range of particle Reynolds number (0.008–10000). To characterize the influence of particle shapes, sphericity is adopted as the general shape factor, which varies from 0.421 to 1.0. By comparing the measured drag with the standard drag curve of spheres, we modify the spherical drag law with three shape-dependent functions to develop a new drag law for non-spherical particles. Combined with an iterative procedure, a new model is thus obtained to predict the settling velocity of non-spherical particles of various shapes and materials. Further applications in hydrochorous propagule dispersal and sediment transport are projected based on deeper understanding of the settling process.
登录
查看更多内容
影响因子：
5.4
作者：
DIETRICH, WE
通讯作者：
DIETRICH, WE
影响因子：
5.2
作者：
M. Taylor;E. Garboczi;S. Erdoğan;D. Fowler
通讯作者：
M. Taylor;E. Garboczi;S. Erdoğan;D. Fowler
影响因子：
3.5
作者：
Jinsheng Wang;H. Qi;Junzong Zhu
通讯作者：
Jinsheng Wang;H. Qi;Junzong Zhu
影响因子：
5.2
作者：
Raymond Lau;Hong Kai Lawrence Chuah
通讯作者：
Raymond Lau;Hong Kai Lawrence Chuah
影响因子：
5.2
作者：
S. Tran-Cong;E. Michaelides
通讯作者：
S. Tran-Cong;E. Michaelides