Chemical Engineering Basics - Engineering

Q1:

In Newton's law of viscosity, which states that the shear stress is proportional to the __________ Co-efficient of viscosity is called dynamic or absolute viscosity(where, V = velocity, Vg = velocity gradient ).

A V2

B 1/V2

C 1/Vg

D Vg

ANS:D - Vg

In Newton's law of viscosity, the shear stress (τ) is proportional to the velocity gradient (dy/dV​). The proportionality constant is the dynamic or absolute viscosity (μ). Mathematically, it can be represented as: τ=μ dy/dV​ Here, μ is the coefficient of viscosity, and dy/dV​ represents the velocity gradient. So, the correct option is Vg.