Question

Difference between reynolds number and particle reynolds number

Answer 1

Reynolds number is a dimensionless number (i.e. it has no units) that is a measure of the type of flow through a fluid. In the case of falling particles, this describes the way that air flows around the particle. ... Small pyroclasts, <1/16 mm, fall in laminar flow regime (Re<0.4).

Particle Reynolds number is defined as:[15]Re=ρf|vr|deqμ,where vr is the relative velocity between the particle and air, and μ is the fluid dynamic viscosity.

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