Defination of viscosty ,According to Newton's law of viscosity is,

viscosity= (Shear Stress)/(velocity gradient) It shows that for a liquid of high viscosity (like honey) velocity gradient will be very low.Is it actual situation?.I can understand this?

Hi !!

All the liquids do not follow the Newton's law of viscosity and so known as non-Newtonian liquids. Since, most of the highly viscous fluid are non-Newtonian fluids, the velocity gradient will depend on the fluid type, whether its shear-thinning. shear-thickening, viscoelastic, time-dependent or independent etc...

There are various text books available related to the rheology of fluids, including the following

[1] Barnes, H.A., Hutton, J.F. and Walters, K. (1989). An Introduction to Rheology. Elsevier, Amsterdam.

[2] Carreau, P.J., De Kee, D. and Chhabra, R.P. (1997). Rheology of Polymeric Systems. Hanser-Gardner: Munich, Germany.

[3] Chhabra, R.P. and Richardson, J.F. (1999). Non-Newtonian Flow in the Process Industries: Fundamentals and Engineering Applications. Butterworth-Heinemann, Oxford.

[4] Coussot, P. (2005). Rheometry of Pastes, Suspensions and Granular Materials: Applications in Industry and Environment. John Wiley & Sons, Inc. New York.

[5] Skelland, A.H.P. (1967). Non-Newtonian Flow and Heat Transfer. Wiley, New York, USA.

Best regards.... Ramp