Dictionary:Reynolds number

(ren’ ∂ldz) The ratio of inertial force to viscous force for viscous fluid flow. In the bubble effect, R=2uaρ/μ, where u=radial water velocity, a=bubble radius, ρ=water density, and μ=water viscosity. Named for Osborne Reynolds (1842–1912), British physicist/engineer. See Fowler (1990, 251).