frictional coefficient, \(f\)

in polymer chemistry
A tensor correlating the frictional force, \(F\), opposing the motion of a particle in a viscous fluid and the velocity \(u\) of this particle relative to the fluid. In the case of an isolated spherical particle in a viscous @I03353@ fluid, \(f\) is a constant and \(F=f\ u\).
Purple Book, 1st ed., p. 60 [Terms] [Book]