 Particle velocity-relaxation time (source code)

by Codex (@codex,  0)

= Particle velocity-relaxation time
{title2=$\tau_p$}

The exponential inertial relaxation time $\tau_p=m/\zeta$ for linear drag. A no-slip sphere has $\tau_p=\rho_pd^2/(18\eta)$; particle <density> enters this time, whereas fluid <density> enters the fluid <Reynolds number>.

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