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For a fluid in motion, pressure at a point is same in all directions, then the fluid is:
  • a)
    Real fluid
  • b)
    Newtonian fluid
  • c)
    Ideal fluid
  • d)
    Non-Newtonian fluid
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
For a fluid in motion, pressure at a point is same in all directions, ...
Newtonian fluids:
  • Newtonian fluids defined as fluids for which the shear stress is linearly proportional to the shear strain rate
  • Newtonian fluids are analogous to elastic solids (Hooke’s law: stress proportional to strain)
  • Any common fluids, such as air and other gases, water, kerosene, gasoline, and other oil-based liquids, are Newtonian fluids
Non-Newtonian fluid:
  • Fluids for which the shear stress is not linearly related to the shear strain rate are called non-Newtonian fluids examples include slurries and colloidal suspensions, polymer solutions, blood, paste, and cake batter
Ideal fluid:
  • Fluids which don’t have viscosity and are incompressible are termed as an ideal fluid such fluid do not offer shear resistance i.e no resistance is encountered as the fluid moves. In ideal fluid, the pressure at a point is the same in all direction.
Real fluid:
  • Fluids which do possess viscosity are termed as real fluids. These fluids always offer shear resistance i.e. Certain amount of resistance is always offered by these fluids as they move.
Hence in practical life, ideal fluid does not exist. It is an imaginary fluid taken into consideration to compare with all other fluids to check how close they are to the ideal fluid.
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For a fluid in motion, pressure at a point is same in all directions, then the fluid is:a)Real fluidb)Newtonian fluidc)Ideal fluidd)Non-Newtonian fluidCorrect answer is option 'C'. Can you explain this answer?
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