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Newton’s law of viscosity for a fluid states that the shear stress is
Real Fluid
Ideal fluid
A fluid is a substance that deformed continuously when shear stress is applied to it irrespective of the magnitude of the shear stress. Because of the continuous deformation flow of the liquid can be seen. In other words, we can also tell that liquid can not sustain any shear load.
Ideal Fluid: A fluid, which is incompressible and is having no viscosity is known as ideai fluid. Ideal fluid is only an imaginary fluid as all the fluids, which exists have some viscosity.
Which one of the following is defined as force per unit length?
Newton's law of viscosity:
where, τ = shear stress
μ = absolute or dynamic viscosity
⇒ du/dy = velocity gradient
⇒ dα/dt = rate of angular deformation (shear strain)
The fluid which obey’s the Newton’s law of viscosity
The fluid which obeys the Newton’s law of viscosity is known as Newtonion fluid e.g.: Air, water, Kerosene.
The General relationship between shear stress (τ) and velocity Gradient for a fluid can be written as
Then the fluid known as
In the expression:
If n < 1, B = 0
then it is known as pseudo plastic
Surface tension a line force caused by cohesion of fluid particle at the surface, the property of cohesion enables a liquid to resist tensile stress.
Which one of the following is correct dimension of surface tension?
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