Relative Viscosity

Written by Jerry Ratzlaff on . Posted in Fluid Dynamics

Relative viscosity, abbreviated \(\eta_r\), is the ratio of the viscosity of a solution to the viscosity of a solution used.

 

Relative Viscosity formula

\(\large{ \eta_r = \frac {\eta} {\eta_s}  }\)   

Where:

 Units English SI
\(\large{ \eta_r }\)  (Greek symbol eta) = relative viscosity \(\large{\frac{lbf - sec}{ft^2}}\) \(Pa-s\)
\(\large{ \eta }\)  (Greek symbol eta) = viscosity of a solution \(\large{\frac{lbf - sec}{ft^2}}\) \(Pa-s\)
\(\large{ \eta_s }\)  (Greek symbol eta) = viscosity of a solution used \(\large{\frac{lbf - sec}{ft^2}}\) \(Pa-s\)

 

Piping Designer Logo 1

Tags: Viscosity Equations