turbulent flow velocity profiles

by suvernfraggle
Tags: flow, profiles, turbulent, velocity
suvernfraggle is offline
Apr17-11, 03:31 PM
P: 3
i've been given this question by my lecturer at university and im struggling with where to start with it to be honest. it feels like i don't have enough information. please can someone help?

For turbulent flow, the velocity profile inside a duct and a pipe of diameters Dd and Dp and
both with distance y from the centre line is: vy/vy=0 = (1-y/r)1/7, where vy=0 = vmean/0.817 and vmean=Q/A. Plot the velocity profiles for:

(a) Air flowing in a duct measuring Dd = 0.6m and with Re = 105.
(b) Water flowing in a pipe measuring Dp = 0.5m and with Re = 105.
(c) Calculate the vmean and vy=0 for both cases (a) and (b)
(d) If the Blasius equation f = 0.079Re-0.25 applies, calculate the values of f and ΔP/L for (a)
Phys.Org News Partner Engineering news on Phys.org
PsiKick's batteryless sensors poised for coming 'Internet of things'
Researcher launches successful tech start-up to help the blind
Researchers propose network-based evaluation tool to assess relief operations feasibility
cloa513 is offline
Apr19-11, 02:48 AM
P: 21

You have to find the kinematic viscoscity from your textbooks or online.

You have enough. Assume hydrauilic diameter is the the same as actual diameter.

Register to reply

Related Discussions
Fluid Mechanics - Turbulent flow velocity profile Engineering, Comp Sci, & Technology Homework 5
turbulent flow velocity profiles Biology, Chemistry & Other Homework 0
turbulent flow velocity profiles Engineering, Comp Sci, & Technology Homework 0
turbulent gas flow General Engineering 4
effect on Flow measuring device due to turbulent flow of air Mechanical Engineering 5