Abstract Natural particles, such as sand and dust, often have irregular, angular shapes without porosity. Such sedimentary particles can have a significantly different drag coefficients than spherical particles, and a robust drag coefficient model is needed to accurately predict their trajectory in multiphase flows. Such a model requires quantitative characterization of their shape. Herein it is shown that the Corey Shape Factor is a suitable parameter to characterize particle drag coefficient for a wide variety of particles with Reynolds numbers up to 2 × 105. This is accomplished by investigating the shape effects for both the Stokes drag regime and for the Newton drag regime to provide a comprehensive and validated drag model for irregular angular particles as a function of Corey Shape Factor. In addition, the shape of ISO 12103 Arizona Road Dust is measured (for the first time) to allow use of the corresponding drag model.

中文翻译：

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不规则棱角颗粒和试验粉尘的形状和阻力

摘要 自然颗粒，如沙子和灰尘，通常具有不规则的、棱角分明的形状，没有孔隙。这种沉积颗粒的阻力系数可能与球形颗粒明显不同，因此需要一个强大的阻力系数模型来准确预测它们在多相流中的轨迹。这种模型需要对其形状进行定量表征。此处表明，科里形状因子是表征雷诺数高达 2 × 105 的各种颗粒的颗粒阻力系数的合适参数。这是通过研究斯托克斯阻力机制和斯托克斯阻力区域的形状效应来实现的。牛顿阻力机制为作为 Corey 形状因子的函数的不规则角颗粒提供全面且经过验证的阻力模型。此外，