Register to reply

Calculate the flow velocity

by supernova1387
Tags: bernoulli, fluid, velocity
Share this thread:
supernova1387
#1
Jul7-13, 09:14 AM
P: 30
This might be simple but I can't remember how to do it.

problem: we have 2 tanks. One filled with atmospheric air at 1 bar and the other is vacuum. The two tanks are connected by a rigid pipe which has a valve. I open the valve and air flows to the vacuum tank. How do I calculate the air velocity?

P.s: I don't think Bernoulli is valid here because the flow isn't steady I guess. Please state your assumptions clearly.

Thanks in advance
Phys.Org News Partner Physics news on Phys.org
'Comb on a chip' powers new atomic clock design
Quantum leap in lasers brightens future for quantum computing
Enhanced NIST instrument enables high-speed chemical imaging of tissues
Baluncore
#2
Jul7-13, 09:37 AM
Sci Advisor
Thanks
P: 1,716
Flow velocity depends on the thickness and length of the pipe, and on the temperature of the air.
SteamKing
#3
Jul7-13, 11:23 PM
Emeritus
Sci Advisor
HW Helper
Thanks
PF Gold
P: 6,265
Instead of 'thickness' of the pipe, the term 'internal diameter' would be more apt.

boneh3ad
#4
Jul7-13, 11:51 PM
PF Gold
boneh3ad's Avatar
P: 1,487
Calculate the flow velocity

Also pay attention to the pressures. The flow is going to start off choked but will eventually un-choke as the pressures equalize.


Register to reply

Related Discussions
Convert an oscillating flow into a flow of constant velocity Advanced Physics Homework 0
Convert an oscillating flow into a flow of constant velocity Engineering, Comp Sci, & Technology Homework 0
Fluids, flow velocity and flow rate. Introductory Physics Homework 2
How to calculate flow velocity in bypass duct Mechanical Engineering 0
Flow rate relation? (velocity distribution in pipe flow) Mechanical Engineering 1