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Apparent viscosity for Non- Newtonian fluid is ____________(a) Constant(b) Depends on the shear stress(c) Depends on the shear rate(d) Dynamic |
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Answer» The correct choice is (c) Depends on the shear rate Explanation: Apparent viscosity (sometimes denoted η) is the shear stress applied to a fluid divided by the shear rate. For a Newtonian fluid, the apparent viscosity is constant, and equal to the Newtonian viscosity of the fluid, but for non-Newtonian fluids, the apparent viscosity depends on the shear rate. In such case, the ratio between shear stress and shear rate is not constant; nevertheless, this ratio for non- Newtonian fluids. |
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