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Question

Which of the following graph shows the relation between shear stress and velocity gradient for a non-Newtonian fluid?

A
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B
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C
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D
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Solution

The correct option is A
For non-Newtonian fluid, the linear relationship between the shear stress and the deformation rate (velocity gradient in parallel flow) as expressed by the τ=ηdudy is not valid. For these fluids the viscosity varies with rate of deformation.
Graph between shear stress vs velocity gradient can be drawn as


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