Reynolds Number

  • Thread starter mm391
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  • #1
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Main Question or Discussion Point

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
 

Answers and Replies

  • #2
boneh3ad
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That depends entirely on the application. That would likely be the most commonly used formulation but there could be others.
 
  • #3
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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.
 

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