When a liquid of density ' $\rho$ ' flows through a tube of diameter ' $d$ ' with critical velocity '…
When a liquid of density ' $\rho$ ' flows through a tube of diameter ' $d$ ' with critical velocity ' $\mathrm{V}$ ' then the Reynolds number is
$\text { ( } \eta=\text { coefficient of viscosity of liquid) }$
$\frac{\eta \rho}{V d}$
$\frac{\mathrm{Vd}}{\rho \eta}$
$\frac{\mathrm{Vpd}}{\eta}$
$\frac{V \eta d}{\eta}$
Solution
Dimensionless number that helps to find the dominant force between inertial force and viscous force. It is defined as,
$\text { Reynold's number }=\frac{\text { inertial force }}{\text { viscous force }}=\left(\frac{\rho \mathrm{Vd}}{\eta}\right)$