Chemical Engineering - Fluid Mechanics - Discussion

Discussion Forum : Fluid Mechanics - Section 1 (Q.No. 4)
The normal stress is the same in all directions at a point in a fluid, when the fluid is
both (a) and (b).
having no motion of one fluid layer relative to the other.
Answer: Option
No answer description is available. Let's discuss.
10 comments Page 1 of 1.

Jyoti said:   1 decade ago
Any motion of different layers relative to each other corresponds to the presence and application of stress upon the fluid particles. Without the application of any stress or external force there would not be any relative motion of fluid layers.

Phoenix said:   1 decade ago
When a fluid is in motion shear stresses are developed if the particles of the fluid move relative to one another. When this happens adjacent particles have different velocities. If fluid velocity is the same at every point then there is no shear stress produced: the particles have zero relative velocity.

Anwesa said:   1 decade ago
This is known as pascal's law. Pressure is independent of orientation of area vector for a fluid at rest.

Kalyanchintu said:   1 decade ago
If the fluid move relative to one another the shear stress must developed and the motion of the fluid influenced by shear stress.

Ghazanfer Ali said:   1 decade ago
Right, as we go in the normal direction fluid velocity increases, and this is due to viscosity, so for a fluid with no viscosity, the relative motion of layers should also be zero, i.e. no change in shear stress, option A should also be correct?

NIKHILSHUKLA said:   1 decade ago
My dear friends,

In the fluid normal stress will act only when hydrostatic force will act on fluid isn't it? and our hydrostatic force will act only when our fluid is at rest ok.

Goutham said:   8 years ago
What is the principle of hydrostatic equilibrium?

Jay said:   6 years ago
The principle of hydrostatic equilibrium is the fluid in which vapour liquid state is in contant. Either liquid nor vapour move untill you doesn't provide any external force.

Kamal said:   10 months ago
Basically normal means perpendicular so doesn't move anywhere.

Shubham said:   3 months ago
Hydrostatic equilibrium fluid is at rest condition that's why the answer is D.

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