What is absolute/dynamic viscosity?

Q.  What is the shear stress in fluid per unit velocity gradient called as?
- Published on 23 Sep 15

a. Absolute viscosity
b. Dynamic viscosity
c. Both a. and b.
d. None of the above

ANSWER: Both a. and b.

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    Discussion

  • Sravanthi   -Posted on 05 Oct 15
    • In Newton's equation, constant of proportionality (μ) is known as absolute or dynamic viscosity.

    • Newton's law of viscosity states that, shear stress is directly proportional to rate of change of velocity with respect to distance τ = μ (du / dy)

    • Constant of proportionality (μ) = τ / (du / dy)

    • Fluidity is defined as reciprocal of absolute viscosity.

    • Viscosity is measured in terms of absolute viscosity or dynamic viscosity and kinematic viscosity.

    • N-s / mm2 is the S.I. unit of absolute viscosity.

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