+1 vote

Why does velocity increase when water flowing in broader pipe enters a narrow pipe?

in Chapter2:Mechanical Properties of Fluids by Expert (11.5k points) | 53 views

1 Answer

0 votes
Best answer

When a tube narrows, the same volume occupies a greater length, as schematically shown in Fig.  A1 is the cross section of the broader pipe and that of narrower pipe is A2

By the equation of continuity, v2, =(A1/A2)v1


Fig. Speed of fluid increases as it enters a narrower pipe

Since A1/A> v2 > v1

For the same volume to pass points 1 and 2 in a given time, the speed must be greater at point 2.

The process is exactly reversible. If the fluid flows in the opposite direction, its speed decreases when the tube widens

by Expert (11.5k points)
970 questions
844 answers
25 users