Type of Flows Type of Flows Type of Flows
External fluid flow External fluid flow Internal fluid flow
Along surface Around an obstacle
\(\mathbf{\text{Re}}_{\mathbf{\text{cr}}}\mathbf{\geq 5}\mathbf{e+5}\) \(\mathbf{\text{Re}}_{\mathbf{\text{cr}}}\mathbf{\geq 2}\mathbf{e+4}\) \(\mathbf{\text{Re}}_{\mathbf{\text{cr}}}\mathbf{\geq 2300}\)