Tagged Questions
3
votes
1answer
222 views
How to estimate the Kolmogorov length scale
My understanding of Kolmogorov scales doesn't really go beyond this poem:
Big whirls have little whirls that feed on their velocity, and little whirls have lesser whirls and so on to viscosity. ...
1
vote
2answers
210 views
Fluid flow through a diverging pipe
Relevant diagram loosely based on my real problem:
Description of problem: A fan creates a pressure sink that drives fluid flow through a gently diverging pipe (please note that the diagram is not ...
2
votes
1answer
169 views
Compressible fluid flow through a branched pipe junctions
Backdrop: Designing a dust extraction system (LEV) with a branched junction.
What principles allow for the calculation of volume flow rate and pressure at the inlets if the volume flow rate and ...
1
vote
0answers
312 views
propeller flying physics for the layman
I'm starting a (quad?)copter build, and i can find plenty of knowledge about stabilizing the craft and things related to gyroscopy.
but there's absolutely zero information on things that help me ...
1
vote
0answers
95 views
Can a the volume flow through a positive displacement pump be reliably measured by tracking revolutions of the drive shaft? [closed]
The question refers to non-compressible fluids.
I'm mostly thinking about monopumps (excentric screw pumps), but this also should apply to any type of gear pumps as well, possibly also to piston ...
0
votes
1answer
339 views
Ping pong ball levitation control system question, modeling as a damper?
I am building a control system to levitate a ping pong ball at a given height in a clear plastic tube using an arduino and implementing PID control.
I have to come up with a transfer function... I am ...
0
votes
1answer
177 views
I want to recreate a phenomenon I've noticed from our water tank
I'm trying to recreate a phenomenon I have noticed from our water tank at home. Ok so we have a deep well pump that fills our water tank everyday. But something odd always happen everytime the water ...
3
votes
1answer
263 views
Tear drop shape
i heard that a tear drop shap is the most aerodynamic shape possible or the best is this true? If this isn't true what is since i need to make a fast ROV? Also since i need to have a propeller to ...
4
votes
2answers
1k views
Shape of Fan Blades
How is the shape of the blades of an air fan determined? Trial and error, or is there a theory behind it? What are they trying to maximize, volume of air dislocated per rotation?
4
votes
5answers
356 views
Tsunami dampening mechanisms
Encouraged by the zeitgeist let me ask the following:
Is it feasible (now or in the future) to build systems a certain distance of a vulnerable coastline which can serve to dampen a tsunami before it ...
