state and explain newtons law of viscosity
Answers
Newton's viscosity law's states that, the shear stress between adjacent fluid layers is proportional to the velocity gradients between the two layers. The ratio of shear stress to shear rate is a constant, for a given temperature and pressure, and is defined as the viscosity or coefficient of viscosity.
Answer:
Newtons law of viscosity:in a steady flow of a fluid past a solid surface,a velocity profile set up such that the viscous drag per unit are on a layer is Directly proportional to the velocity gradient.
Explanation:
when a fluid flows past a solid surface in a streamline flow or when a solid body moves through a fluid, the force of fluid friction opposing the motion is called the viscous drag.The magnitude of the viscous drag of a fluid is given by Newton's law of viscosity.
If dv/dy is the velocity gradient,the viscous drag per unit area on a layer ,
F/A is directly proportional to the dv/dy
:-F/A=n dv/dy
whereas the constant of proportionality,n,is called the coefficient of viscosity of the fluid.