Methods to determine Coefficient of viscosity by capillary
tube method

__Capillary Tube
Method :__

In this method we use
Hagen Poiseuille law to determine the viscosity of the liquid . In this method
we measure viscosity by measuring the pressure for a particular length of the
capillary tube.

As shown in the below figure

Here h = Difference of pressure head for length L

Q = Flow rate in m^3

D = capillary tube diameter

L = Tube length for which we know the pressre difference

ρ = Density of the liquid

µ = Coefficient of viscosity

By using Hagen Poiseuille's Formula we get this equation to calculate viscosity in real life

$μ=128QLπρghD_{4} $

## 0 Comments

if you are not getting it then ask i am glad to help