Civil Engineering MCQAE Level Civil Engineering
Dynamic (absolute) viscosity mu is defined as the ratio of:
Fluid MechanicsViscosity DefinitionMEDIUM
Choose the correct answer
A
Shear stress to velocity gradient (du/dy)
B
Shear stress to velocity
C
Velocity to density
D
Density to kinematic viscosity
Correct Answer
A. Shear stress to velocity gradient (du/dy)
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Newton law of viscosity: tau = mu x (du/dy), so mu = tau / (du/dy). Units: Pa.s (N.s/m2). Kinematic viscosity nu = mu/rho (m2/s). Water at 20 C: mu = 1.002 x 10^-3 Pa.s.
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