Question

5) Express the Reynolds number in terms of mass flowrate . a. Explain why chemical engineers would usually use this definition for analysis to compare with experiments 6) Why does the diverge to infinity as . this is where a pipe meets a reservoir in the entrance region? 7) Explain why Turbulent flows have larger entrance lengths?

applied fluid mechanics

Please answer these questions

Answer 1

Ans 5 )

DV 4Q Re DVP u 4m π Dμ V a Dv

Ans 5a Chemical Engineers would usually use this defination to check the nature of fluid flow laminar or turbulent

Ans 6.

Lower the velocity of flow it would take more time to become a fully develop flow due to those shear stress along the boundary layer.

When pipe meets a reservoir the velocity is very low in reservoir. thats why they diverge to infinity.

Ans 7 Turbulent flow have larger entrance length because the velocity profile of turbulent flow is higher than laminar flow

entially V= f(x,0) Flow is Parabolic After HEL v=f(r) utf(0) = ķ LA (Hydrodynamically ISmox of Hydrodgnamically fully Entrance length developed region (HEL) (HFDR) Smarx =/ distance) ar cradial

- ISmx LA (Hydrodynamically Entrance length (HEL) & Hydrodynamically fully developed region (HFDR) f-vary (friction factor) f = Constant f Entrance Region Fully develop region > x →