• question_answer While water passes through a given pipe at a mean velocity 'V, the flow is found to change from laminar to turbulent. If another fluid of specific gravity 0.8 and coefficient of viscosity 20% of that of water, is passed through the same pipe, the transition of flow from laminar to turbulent is expected if the flow velocity is: A) 2V                               B) VC) V/2                              D) V/4

Re $=\frac{vd}{v}$ $v=\frac{\mu }{\rho },$ ${{v}_{2}}=\frac{0.2\mu }{0.8\rho }=\frac{\mu }{4\rho }=\frac{v}{4}$ $\frac{vd}{v}=\frac{4{{v}_{2}}d}{v}$ ${{v}_{2}}=\frac{v}{4}$