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Volume 11, No. 5, October 2011, Pages 482-486 PDF(228 KB)  
doi: 10.4209/aaqr.2011.05.0069   

Drag Coefficient of a Spherical Particle Attached on the Flat Surface

Chun-Nan Liu, Chih-Liang Chien, Chu-Chun Lo, Guan-Yu Lin, Sheng-Chieh Chen, Chuen-Jinn Tsai

Institute of Environmental Engineering, National Chiao Tung University, No. 1001, University Road, Hsin Chu, 300 Taiwan

 

Abstract

 

The previous analytical solution for the drag coefficient (Cd) for a spherical particle attached on the flat surface, which was derived by O’Neill (1968), is only valid in the creeping flow conditions. It is important to extend O’Neill’s formula to cover a wide range of particle Reynolds number (Rep). In this study, the drag coefficient was calculated numerically to cover Rep from 0.1 to 250. For a particle suspended in the air, an empirical drag coefficient exists, which is defined as Cd = f × 24/Rep, where f is a correction factor depending on Rep. The applicability of the correction factor f for O’Neill’s analytical equation for the spherical particle attached on the flat surface for Rep = 0.1 to 250 was examined in this study.

 

 

Keywords: Drag coefficient; Boundary layer; Numerical simulation; Reynolds number.

 

 

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