About AAQR

Aims and Scope

Articles online
For contributors
Call for Papers
Guideline for the
Special Issue Proposal


Contact Us
Search for  in   Search  Advanced search  


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




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.



Copyright © 2009-2014 AAQR All right reserved.