(10 points). Q2. Write down all incorrect sentence(s) (if any) from the list bel

Question

(10 points). Q2. Write down all incorrect sentence(s) (if any) from the list below -In a shearing fluid, normal stresses do not have to be equal to pressure. -There is a maximum of 3 independent shear stress components. -A rheopectic fluid shows higher apparent shear viscosity with an increase in shear rate and time. -A non-stationary fluid undergoes shear. -Viscosity of He (helium) increases proportional to square root of absolute temperature. -The absolute value of shear rate is always equal to V/Y for simple shear flow between parallel nlatee where V is the velocitv of the bottom plate, Y is the distance, and top plate is stationary

Explanation / Answer

Incorrect statements

1. A rheopectic fluid shows higher apparent shear viscosity with increase in shear rate and time.

Explanation - Fluids showing higher apparent shear viscosity with an increase in shear rate are called shear thickening or dialatant fluids.

Rheopectic fluid are those which higher apparent viscosity increase in time.

2. The absolute value of shear rate is always equal to V/Y for simple shear flow between parallel plates.

Explanation - Absolute shear stress concept is valid only when a point is subjected to 3 D state of stress so that there will be 3 planes, i.e. xy, yz and zx.

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