Flow Velocity- Guranteed to be Laminar

[flash_659]

Homework Statement

Q) Water (p = 998 kg/m^3
, n = 1.0*10^-3 Pa.s at 20C) at 20C flows through a pipe of
diameter 50.0 mm. What is the maximum average flow velocity if the flow is
guaranteed to be laminar? Give your answer in mm/s.

Homework Equations

Reynolds number=(pvd)/n

The Attempt at a Solution

I am absolutely stumped on this last question for my assignment, I have no idea what to or how to calculate the flow from just these given constants.

 

[Spinnor]

I can't answer your question but this page looks like it does.

http://www.cs.cdu.edu.au/homepages/jmitroy/eng243/sect09.pdf

From search,

https://www.google.com/#hl=en&safe=...61bb298ce55c926&bpcl=35243188&biw=981&bih=647

 

[2h2o]

You're given everything you need for the equation, except for the "soft" values Reynolds numbers that are a result of laminar flow. Most agree on the following:

for circular pipe flow only

laminar: Re < 2000
transitional: 2000 < Re < 4000
turbulent: Re > 4000

So, pick a Re that you think will "guarantee" laminar flow, plug n chug.

Hope I didn't just give it away too easily, but the values of Re were the only thing that you were missing.