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Reynolds Equation

Reynolds Equation

Reynolds Equation

(OP)
Hi everyone, I'm just drawing a blank here and can't remember the 1d reynolds equation..help?

RE: Reynolds Equation

Emmett04:

There must be over 100,000 references to Reynolds' famous classical relationship on such search engines like Google.  It would certainly behoove you to use that convenient and ample avenue for such basic information.  But, since I already started this post:

Re = Dvd/mu

D = pipe inside diameter
v = fluid's average velocity
d = fluid's density
mu = fluid's absolute viscosity

The result, as you should know, is dimensionless; so make sure all your units cancel out.

Art Montemayor
Spring, TX

RE: Reynolds Equation

Dimensionless Reynolds number, as other famous dimensioneless numbers (Froude, Cauchy, Weber, and Euler), is the ratio of two forces.

In the case of the Re, it is the ratio of inertia forces to viscous forces: ρL2V2/(μVL) = ρVL/μ as given by Montemayor. Where for pipe flow:

V=velocity
ρ=density
L=diameter
μ= viscosity

In consistent units.

RE: Reynolds Equation

Emmett04, kindly clarify whether you refer to the famous Reynolds number as explained by Montemayor, or to Reynolds one-dimensional equation for the "long bearing approximation" as in hydrodynamic lubrication.

RE: Reynolds Equation

And here the on-line freeware to calculate Reynolds and more:

http://www.carf-engineering.com/

Made by myself so it must be good ; )
CARF

RE: Reynolds Equation

Still Emmett004 hasn't clarified whether he's after the Reynolds number equation or after the 1d Reynolds equation of hydrodynamic lubrication.

RE: Reynolds Equation

25362,  From his profile, it looks like he logged in one time, started the thread, and hasn't been back since.

hmmm

rmw

RE: Reynolds Equation

rmw, it also may be that after reading the satisfying answers Emmett004 called it a day.

RE: Reynolds Equation

May be he was asking for an equation to know the length of a straight line(1d) that a Reynolds Pen can draw 0

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