Flow Velocity- Guranteed to be Laminar

AI Thread Summary
To determine the maximum average flow velocity for laminar flow in a pipe with a diameter of 50.0 mm, the Reynolds number must be calculated using the formula Re = (pvd)/n. For water at 20°C, with a density (p) of 998 kg/m^3 and a dynamic viscosity (n) of 1.0 x 10^-3 Pa.s, laminar flow is guaranteed when the Reynolds number is less than 2000. The discussion emphasizes that the missing component for the calculation is selecting an appropriate Reynolds number that ensures laminar flow. Participants suggest using the established threshold values for Reynolds numbers to find the maximum flow velocity. Understanding these parameters is crucial for solving the problem effectively.
flash_659
Messages
5
Reaction score
0

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.
 
Physics news on Phys.org
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.
 
Thread 'Collision of a bullet on a rod-string system: query'

Thread 'Collision of a bullet on a rod-string system: query'

In this question, I have a question. I am NOT trying to solve it, but it is just a conceptual question. Consider the point on the rod, which connects the string and the rod. My question: just before and after the collision, is ANGULAR momentum CONSERVED about this point? Lets call the point which connects the string and rod as P. Why am I asking this? : it is clear from the scenario that the point of concern, which connects the string and the rod, moves in a circular path due to the string...
View full post »
Thread 'A cylinder connected to a hanged mass'

Thread 'A cylinder connected to a hanged mass'

Let's declare that for the cylinder, mass = M = 10 kg Radius = R = 4 m For the wall and the floor, Friction coeff = ##\mu## = 0.5 For the hanging mass, mass = m = 11 kg First, we divide the force according to their respective plane (x and y thing, correct me if I'm wrong) and according to which, cylinder or the hanging mass, they're working on. Force on the hanging mass $$mg - T = ma$$ Force(Cylinder) on y $$N_f + f_w - Mg = 0$$ Force(Cylinder) on x $$T + f_f - N_w = Ma$$ There's also...
View full post »

Similar threads

A fun, engaging and visual way of showing laminar flow for young kids
Replies
1
Views
2K
Flow Velocity- Guranteed to be Laminar
Replies
3
Views
2K
Sanity check on falling steel ball in water
Replies
5
Views
2K
Is the Flow Laminar or Turbulent? Determining with Reynolds Number
Replies
1
Views
3K
How to Calculate Velocity in Pipe Using Friction Factor and Kinematic Viscosity?
Replies
6
Views
2K
B Beam of air: Extending the range of a fan
Replies
17
Views
3K
Can Reynolds Number < 70 Cause Turbulence in Elbow Fittings?
Replies
20
Views
4K
Finding height of buffer regions and viscous sublayer turbulent flow
Replies
4
Views
2K
Maximum height for water from a fire hose
Replies
4
Views
4K
Using the steady flow energy equation, find the power required
Replies
11
Views
4K

Hot Threads

Recent Insights

Back
Top