Graph of change in shear stress wrt velocity gradient - Fluid Mechanics

Q.  The below diagram is a graph of change in shear stress with respect to velocity gradient in a fluid. What is a type of the fluid?
- Published on 04 Aug 15
FM


a. Newtonian fluid
b. Non-Newtonian fluid
c. Ideal fluid
d. Dilatent fluid

ANSWER: Non-Newtonian fluid

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    Discussion

  • Sravanthi   -Posted on 25 Sep 15
    In Non-Newtonian fluid, the shear stress is not directly proportional to the rate of shear stain or velocity gradient. It does not obey the Newton's law of viscosity. In the given graph of change in shear stress with respect to velocity gradient in a fluid, the shear stress does not proportional to the velocity gradient. The Newtonian fluid and the ideal fluid have straight line graph. Dilatent fluid has flow behavior index greater than one. Hence the fluid shown in graph is Non-Newtonian fluid.

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