Note on Reynolds Number

The Reynolds Number is a dimensionless combination of variables important in viscous flow studies for analyzing flows when there is a substantial velocity gradient or shear. The number indicates the relative significance of the viscous effect compared to the inertial effect and is proportional to the inertial force divided by the viscous force.

where D = characteristic length, v = velocity, p = density, x = dynamic (absolute) viscosity, G = mass velocity.

The viscosity above is dynamic viscosity also called absolute viscosity. For a pipe the characteristic length is the diameter of the pipe.

0 0

Post a comment