Newsgroup sci.mech.fluids 2883

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Re = rho * V * D / mu
V is proprtional to the mass flow rate, V = mdot/(rho*A)
etc.
So if you know the fluid properties and the flow rate, the Re can be
calculated. This is perhaps one simple way.
Syed R. Husain, Ph.D
r  wrote in article <54b2co$t59@hermes.oanet.com>...
> In article , cb@icb.hro.eunet.de
says:
> >
> >Can anyone give help or advice with the folllowing?
> >
> >Imagine a rather complex flow system like the external flow through a
bundle of 
> >tightly packed capillaries. How can be determined whether the local flow
within 
> >the bundle is exhibiting laminar or turbulent characteristics without
having to 
> >use sophisticated (and costly) turbulence measurement techniques?
> >
> Is it possible to compute the Reynolds' Number in the capillaries? If so
> you would then have a good idea if the flow was turbulent or laminar. I
> think there would need to be a very high pressure drop across the 
> capillaries for the flow to be turbulent since the very small diameter of
> the flow passages tends to give very high Reynolds' Numbers - well above 
> the 4000 or so where turbulence starts to manifest itself.
> 
> 

I was wondering if anyone has some experimental results involving
pressure drop or friction factor values in any channels whose hydraulic
diameter was anywhere near 100 microns.
Thank you,
Roy Zeighami

In article <7o02RD4w165w@bwalk.dm.com>,
Dr. Dimitri Vulis  wrote:
[bunch of malice, lies, edited quotes, and incitment to harass deleted]
This was just an honest mistake, right, Dimitri?
--