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seal leakage estimation

seal leakage estimation

seal leakage estimation

(OP)
I am reading Stepanoff on leakage flow (chapter 10), but I can't understand how to calculate the Reynolds number for the annular flow. What flow speed do I use?

I suspect the speed to use the charts is the one calculated considering:

v = (2*pi*N/60)* d/2

being N the shaft speed in rpm and d the diameter of the seal.

But I am only guessing, I can't find it there nor in any other book.

RE: seal leakage estimation

Might want to specify which Alexey J. Stepanoff book are you referring to.  

RE: seal leakage estimation

Well that equation is calculating the angular velocity (tangential velocity) of the fluid at the seal face as being in unison with the shaft rotation.  I'm not familiar with Stepanoff's book, but that seems a perfectly reasonable basis for further estimations.

"Annular flow" will be flow in the direction aligned with the shaft centerline.  What does he say about relating the angular velocity to annular flow?  Is that obtained from the charts you mention?

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