Question

Calculate Reynolds number, if a fluid having viscosity of 0.4 Ns/m2 and relative density of 900 kg/m3 through a pipe of 20mm with a velocity of 2.5 m.

Answer 1

Reynold number is used to determine the flow of fluid which is laminar or turbulent

$R_e= \frac{\rho vd}{\mu}$ , here $\rho= density$ of fluid=$900 \frac{kg}{m^3}$ , v= velocity of the fluid =2.5 m/s

d= diameter of pipe=20 mm= 0.02m, $\mu$ = coefficient of viscosity= 0.4 $\frac {Ns}{m^2}$

$R_e= \frac{\rho vd}{\mu}$

$R_e= \frac{900\times 2.5\times 0.02}{0.4}$

$R_e=$ 112.5

So, The Reynold number for this fluid flow is =112.5