Question

Capillary tube viscometers used for measurement of viscosity are based on -

• A. Hagen - Poiseuille equation
• B. Stoke's Law
• C. Chezy equation
• D. Darcy - Weisbach equation

Answer 1

Answer:

A. Hagen - Poiseuille equation

Capillary tube viscometers measure the viscosity of a fluid by measuring the pressure needed to force the fluid to flow at a specified rate through a narrow tube. This type of viscometer is based on laminar flow through a circular pipe and uses the Hagen-Poiseuille equation to calculate the viscosity of the liquid. The equation is µ=$(\frac {\pi}{128}) \frac {W_lh_fd^4} {QL}$