Experimental study of sedimentation characteristics of spheroidal particles--颗粒学报PARTICUOLOGY

Wang, J., Qi, H., & You, C. (2009). Experimental study of sedimentation characteristics of spheroidal particles. Particuology, 7(4), 264–268. https://doi.org/10.1016/j.partic.2009.03.008

Experimental study of sedimentation characteristics of spheroidal particles

Jinsheng Wang, Haiying Qi^*, Changfu You

Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Tsinghua University, Beijing 100084, PR China

10.1016/j.partic.2009.03.008

Volume 7, Issue 4, August 2009, Pages 264-268

Received 4 November 2008, Accepted 18 March 2009, Available online 21 June 2009.

E-mail: hyqi@mail.tsinghua.edu.cn

Highlights

Abstract

The drag of non-spherical particles is a basic, important parameter for multi-phase flow. As the first step in research in this area, the terminal velocities, U_t, of hemispherical and spherical segment particles with maximal diameters of 6–21 mm were measured in static fluids by using a high-speed video camera. The drag coefficient, C_D, measured for Reynolds number, Re of 10¹–10⁵, has been obtained and compared with those for a sphere. The Re based on the terminal velocity has a logarithmic linear relationship with Ar number for both the facet facing upwards or downwards for the two experimental spheroidal particles, and their C_D values are greater than those of spheres. A shape function that depends on the initial orientation of the particle facet is presented to correct for the shape effects.

Graphical abstract

Keywords

Spheroidal particles; Terminal velocity; Drag coefficient; Shape function

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