Question
Download Solution PDFWhich of the following forces does NOT act on fluid which is at rest?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFExplanation:
Static fluid
- Static fluid, fluid at rest has no shear stress.
- Consequently, any force developed is only due to normal stresses i.e., pressure.
- The fluid is to be at rest if there is no relative movement between the adjacent particles of the fluid i.e. no shear stress is acting on the fluid.
- Hence, the viscous force is inconsiderable in this case.
- However, fluid particles are always acted upon by external pressure and their own self-weight.
- Surface tension acts only for fluid at rest condition.
Additional Information
Viscous Force:
- It is equal to the product of shear stress (τ) due to the viscosity and surface area of the flow.
- It is present in fluid flow problems where viscosity is having an important role to play.
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