Hydraulics, Flow rate from Bernoulli Equation

[warrio1010]

Homework Statement

Flow rate in Venturi meter of Petrol (SG 0.85).

Diam₁ - 0.2m Diam₂ - 0.15m

Height Diff in manometer of Mercury (SG 13.6) 0.012m, so Δp= 13600 x 9.81 x 0.012 = 1601?

C_d = 0.98

Homework Equations

Bernoulli,
p/ρg + U²/2g + Z

U=Q/A

The Attempt at a Solution

Inserting and equating the values into bernoulli i ended up with,

0.192 = Q₂²/0.093 - Q₁²/0.058

Not sure if this i right because i can't seem to go anywhere from here.

THE GIVEN ANSWER IS 39.3 l/s

Thanks a lot for any help.

 

[LawrenceC]

Q1 equals Q2. How are the numbers 0.093 and 0.058 computed?

 

[warrio1010]

They are calculated from 2g x A after subbing u for Q/A.