Flow Through Capillary

Abstract

With introductory remarks about laminar and turbulent flow, expression for rate of discharge of liquid for a laminar flow has been derived. The expression does contain kinetic energy term. Different confusing numerical factors appearing in various literatures in the kinetic energy term have been explained. SI units of dynamic and kinematic viscosities together with their corresponding CGS units have been given. Kinematic viscosity in terms of efflux time for given volume of liquid is given in terms of efflux time. Corrections applicable to viscometer constants to capillary viscometers due to various parameters have been derived. The parameters are gravity, buoyancy, thermal expansion of viscometer bulb, different temperatures of loading and use, surface tension, temperature coefficient of viscosity etc.