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Reynolds Number


1. General formula
2. Flow regimes - laminar and turbulent
3. Reynolds number for stirred reactors

1. General Formula

For circular pipes only

Calculation Reynolds Number circular pipe

Re=Reynolds number for circular pipe (adimensional)
D=diameter of pipe (m)
<u>=mean velocity (straight section) (m/s)
ρ=Volumic mass of the liquid (kg/m3)
μ=Dynamic viscosity (Pa.s)

2. Flow regimes - laminar and turbulent

Re<2100 : laminar regime
2100<Re<4000 : intermediary regime
Re>4000 : turbulent regime

3. Reynolds number for stirred reactors

Reynolds number for stirred reactor

Calculation Reynolds Number circular pipe


Re<10 : laminar regime
10<Re<10000 : intermediary regime
Re>10000 : turbulent regime

D=diameter of agitator (m)
N=agitator speed (rps)


Source

Mecanique et Rheologie des fluides en genie chimique, Noel Midoux, Lavoisier Tec et Doc, page 139, page 246