Settling velocity of non-spherical hydrochorous seeds
Settling velocity of non-spherical hydrochorous seeds
复制标题
非球形氢化磷种子的沉降速度
DOI：
10.1016/j.advwatres.2017.03.001
复制
发表时间：
2017-05
影响因子：
4.7
通讯作者：
Huai W. X.
中科院分区：
文献类型：
--
作者：
Zhu X.;Zeng Y. H.;Huai W. X.
不规则颗粒的沉降速度受颗粒性质（密度、大小和形状）和流体性质（密度和粘度）的影响，因此是颗粒雷诺数和颗粒形状的函数。从文献中收集了大范围的颗粒雷诺数（0.03-10,000）的实验数据，以建立非球形颗粒阻力系数和沉降速度的经验公式。采用三个形状因子，并根据颗粒类型推荐不同尺寸的描述符。对于无量纲直径较大的粗颗粒，形状对沉降速度的影响更为显著，为进一步提高预测精度，推导了分段公式。与其他模型相比，新公式更准确地预测了不规则颗粒的沉降速度。同时，对鄱阳湖3种不同类型的水栖种子进行了室内沉降速度测量，并将实测沉降速度与预测沉降速度进行了比较，结果表明经验公式可适用于非球形颗粒型水栖种子，丰富了对水栖动态格局的研究。
The settling velocity of irregular particles is affected by both particle properties (density, size, and shape) and fluid properties (density and viscosity) and is therefore a function of particle Reynolds number and particle shape. Experimental data from the literature have been collected on a wide range of particle Reynolds numbers (0.03–10,000) to develop empirical formulae for drag coefficients and settling velocities of non-spherical particles. Three shape factors were adopted and different dimensions of descriptors were recommended according to the types of particles. For coarse particles with large dimensionless diameter, the effect of shape on settling velocity is more significant, and thus piecewise formulae were derived to further improve prediction accuracy. Compared with other models, the newly presented formulae predict more accurately the settling velocity of irregular particles. Moreover, settling velocities of three types of hydrochorous seeds collected from Poyang Lake were measured in the laboratory and the comparison between the measured and predicted settling velocity shows that the empirical formulae can be applied to non-spherical granular hydrochorous seeds and can enrich the study on the dynamic pattern of hydrochory.
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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：
2.2
作者：
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通讯作者：
J. Goodson;A. Gurnell;P. Angold;I. Morrissey
影响因子：
5.2
作者：
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通讯作者：
Sommerfeld, Martin
影响因子：
1.8
作者：
Wadell, H
通讯作者：
Wadell, H