Froude Number Equations
Froude Number Equations
(OP)
Dear Colleagues,
I found in a literature the different form of the Froude No. equation: Fr= V^2/g*D, instead of the well-known form: Fr= V/SQRT(g*D).
At the same velocity the equations gave the different Froude numbers.
Which of the equations is more correct?
Thank you,
Mike
I found in a literature the different form of the Froude No. equation: Fr= V^2/g*D, instead of the well-known form: Fr= V/SQRT(g*D).
At the same velocity the equations gave the different Froude numbers.
Which of the equations is more correct?
Thank you,
Mike
RE: Froude Number Equations
Ha - trick question. They both are. However: https://en.wikipedia.org/wiki/Froude_number#Defini... suggests the second one is the correct one.
RE: Froude Number Equations
Good Luck,
Latexman
RE: Froude Number Equations
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: Froude Number Equations
That isn't to say that one of them doesn't reduce to the first one, but I don't know of it.
= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, consulting work welcomed
RE: Froude Number Equations
I found the 1st equation in the "Beggs-Brill Two--phase flow in pipes" book. Please see the attached. In the equation Vm is 2-ph mixture velocity.
For which applications the 1st and 2nd forms are applicable?
Thanks, Mike
RE: Froude Number Equations
RE: Froude Number Equations
RE: Froude Number Equations
Squaring is normally done to eliminate negative values; if somehow a negative velocity crept in, that would be taken care of.
I see the same construction in https://www.sciencedirect.com/topics/engineering/f... as used in a number of articles.
RE: Froude Number Equations
If you are using the correlations, charts, graphs, etc. in their book, use their definition.
If you are not using the resources in their book, use v/(gd)1/2.
Or, it's an error in their book. Try to search for errata for the book, or contact the authors, if they are still alive.
My $0.02.
Good Luck,
Latexman
RE: Froude Number Equations