CCalc - Calculating Reynolds Number for an Impinging Jet

[mm391]

I am trying to work out a reynolds number for an impinging jet using air. If I have:

μ=1.8*10^-5 kg/ms
ρ=1.2 kg/m³
Velocity = 90m/s
Nozzle Diameter=15mm

is it Re = ρ u dh / μ

Which is (1.2 kg/m³*90m/s*0.015m)/1.8*10^-5 kg/ms

Thanks

M

 

[boneh3ad]

That depends entirely on the application. That would likely be the most commonly used formulation but there could be others.

 

[Shaun_W]

If that's the data you're given then that's probably the formula you have to use. If you're unsure then check that your final answer is dimensionless i.e. has no units.