1. Flows for which viscosity is not neglected are called viscous flows . 2. Flows for which viscosity cannot be neglected are called viscous flows . 3. Osborne Reynolds ( 1866 ) derived the equation of viscous flow . 4. Thus, in cases of very viscous flows ( e . g. 5. The distinction lies in the ability to respond to an applied shear force via macroscopic viscous flow . 6. Also, Lamb derived for the first time a solution for the viscous flow around a circular cylinder. 7. These materials do show viscous flow is the dominant source of plastic deformation, and is also very slow. 8. This viscous flow is at least 50 m thick, thus leaving an irregularity in the profile of the volcano. 9. After this " elastic " phase, uplift proceed by " slow viscous flow " so the rate decreased exponentially after that. 10. The Galilei number is used in viscous flow and thermal expansion calculations, for example to describe fluid film flow over walls.