RE: Regarding flow element installation in piping

From: <Geoff>
Date: Sun Jun 15 2003 - 17:34:00 EDT

You might like to investigate some research by Dr Alan Thomas (Australia) in respective of slurry transport. In the basic work he investigated the micro eddies at the pipe wall and how these break away and cause turbulence. The micro eddies allow solids to be transported away fom the boundary wall. The popular concepts (myths) of laminar versus turbulent flow are explained in depth.

Geoff Stone
--- Steve McKenzie <Mechproj@xtra.co.nz> wrote:
> It doesnt matter how long the pipe is; if the Reynolds number says the flow
> is turbulent, then it will remain so. The main point of the upstream and
> downstream "D"s is to remove spin from the fluid and to promote an
> axisymmetric flow profile.
>
> Cheers
>
> Steve McKenzie
>
> -----Original Message-----
> From: Paul Bowers [mailto:pbowers@pipingdesign.com]
> Sent: Friday, June 13, 2003 3:23 PM
> To: PipingDesign@yahoogroups.com
> Subject: Re: [PipingDesign] Regarding flow element installation in
> piping
>
>
> The ideal flow profile is laminar, so the less turbulent, the better (as
> mentioned below - I'm just adding a nifty keyword).
>
> http://hyperphysics.phy-astr.gsu.edu/hbase/pfric.html
>
> Paul
>
> ----- Original Message -----
> From: "Sharma, R" <RSharma@mcdermott.com>
> To: <PipingDesign@yahoogroups.com>
> Sent: Wednesday, June 11, 2003 8:51 AM
> Subject: RE: [PipingDesign] Regarding flow element installation in piping
>
>
> > Upstream and downstream straight length requirement depends on
> > the fluid, flow conditions and the type of meter used.
> > It is merely to straighten / streamline the flow (from turbulence)
> > for accurate measurement. Process / Instrument guys can help
> > you in deriving this stuff. If you have problems in acheiving this
> > straight length in the layout, you can go for flow straightners,
> > which are simply a bundle of tubes inserted in the line pipe !
>
>
>
>
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