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, Hsinchu, 300, Taiwan

Received: May 24, 2011
Revised: June 24, 2011
Accepted: June 24, 2011
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Cite this article:
Liu, C.N., Chien, C.L., Lo, C.C., Lin, G.Y., Chen, S.C. and Tsai, C.J. (2011). Drag Coefficient of a Spherical Particle Attached on the Flat Surface. Aerosol Air Qual. Res. 11: 482-486.



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

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