Originally Posted By: CR94
Originally Posted By: Bud_One
1. ... I under stand what they are (external force resistance Dynamic vs no external force resistance Kinematic), but don't have an answer for their relationship.
In other words, kinematic viscosity is absolute viscosity divided by density of the fluid, therefore is more relevant when the shearing forces are associated with mass (whether through inertia or gravity).
We should remember all that from basic physics or fluid mechanics.
Very good all, and thanks for responding.
Continuing with our series on viscosity, we know the opposition of a fluid to flow is primarily defined by the fluids viscosity.
Absolute or Dynamic viscosity is defined as, The Tangential Force Per Unit Area required to Move one Horizontal Plane with respect to Another Horizontal Plane a Distance Unit Apart. Dynamic or Absolute viscosity is measured in "poise" or centi-poise, or Pascal*seconds (Pa*s).
Kinematic viscosity is defined as, The Ratio of Dynamic Viscosity Divided by the Fluid's Density, or rho, and is measured in stokes or centi-Stokes, or mm^2/s.
Kinematic Viscosity is tested and reported at 40C and 100C in order derive the Viscosity Index of a fluid.
