A long straight pipe of circular cross-section has a radius that varies along the length of the pipe. These is a steady flow in the pipe, with no sources or sinks. At one point P1 in the pipe the radius is r1 and the mass flux through P1 is a constant Q1. Further along the pipe is a point P2 where the radius is r2 = r1/3.(a) The mass flux through P2 is measured to be Q2, where Q2/Q1 is(A) 9.(B) 3.(C) 1.(D) 1/9.(E) dependent on the fluid densities at P1 and P2.(b) The ratio of flow speeds, v2/v1 , is(A) 9.(B) 3.(C) 1.(D) 1/9.(E) dependent on the fluid densities at P1 and P2.

Hrishant Goswami , 9 Years ago

Grade 10