Fluid Dynamics: Finding Speed in Venturi Tube

[victorlee2]

Homework Statement

The horizontal constricted pipe illustrated in
lee (vl3765) – UTHW#34-Dluid Dynamics1 – hamaguchi – (32001) 3
the figure (a Venturi tube), can be used to
measure flow velocities in an incompressible
fluid.
The ratio for the cross section areas of the
tube is A2/A1 = 0.478, the difference in the
pressures is P1 −P2 = dP = 18.2 Pa , and the
density of the fluid is 1.08 kg/m3.
Find the speed of the fluid near the right
hand end of the tube (i.e., find v2).

Homework Equations

Bernoulli's equation

The Attempt at a Solution

alright so i wrote out the bernoulli's equation P1 + 1/2rov1^2 + rogh1 = P2 + 1/2rov2^2 + rogh2

so they told us that P1-_2 = 18.2 so i moved P2 to the other side, thus making it 18.2. then since A2/A1 = .478 that means v1/v2 = .478 as well. doing that i found out that v1 = v2*.478. so i just plugged all these founds into the equation. also since height is = 0m, both sides with the h's are crossed out leaving P1 + 1/2 rov1^2 = P2 + 1/2rov2^2. i cannot get the answer and this homework is due in 1/2 an hr. I've been working on this for 4 hours straight no joke. PLEASE HELP

 

[victorlee2]

forget it.

 

[kerimek]

I would suggest checking your calculations and making sure you have the correct values for all variables. It is also important to double check your units and make sure they are consistent throughout the equation. If you are still having trouble, I would recommend seeking help from a classmate, TA, or professor. It is important to not rush through homework and to take the time to fully understand the problem and solution. Good luck!