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 Re: Backun Mouthpiece=Zinner Blanks
Author: Tony Beck 
Date:   2006-08-18 20:09

As an engineer who has done a lot of low speed aerodynamics work on remotely piloted vehicles, I’ll crawl way out on this limb. Start sawing Dave and Dr. Henderson!

At very low air speeds, such as in the bore of a clarinet, a smooth (laminar) boundary layer is not necessarily a good thing. Under the wrong conditions it can thicken, stagnate and go into what is called laminar separation. In a pipe, such as a clarinet, this can greatly destabilize and even choke off flow.

Boundary layers generally start off laminar and at some point down stream trip to turbulent. An excellent example of this is the rising smoke from a cigarette. With a turbulent boundary layer, there is energy exchange between free stream flow and air laying on the surface. This energy exchange tends to keep flow attached to the pipe wall with no instability or big dead zones. I suspect that what Morrie is doing is to trip the boundary layer early and thus assure a stable flow through the mouthpiece. This is a very common trick with problem flows on aircraft wings.

Stable, useful, laminar flow doesn’t develop until airspeeds way above anything that’s going through a clarinet (unless you are holding it out the window of your car going 60 mph!) At the flow rates where we live, laminar flow is much more of a problem than a good thing.

Without being able to examine flow through a mouthpiece, the above is a best guess, whatever that's worth.

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 Topics Author  Date
 Backun Mouthpiece=Zinner Blanks  new
Scotti 2006-08-17 16:48 
 Re: Backun Mouthpiece=Zinner Blanks  new
clarnibass 2006-08-17 16:52 
 Re: Backun Mouthpiece=Zinner Blanks  new
Scotti 2006-08-17 16:54 
 Re: Backun Mouthpiece=Zinner Blanks  new
DAVE 2006-08-17 17:10 
 Re: Backun Mouthpiece=Zinner Blanks  new
L. Omar Henderson 2006-08-17 17:14 
 Re: Backun Mouthpiece=Zinner Blanks  new
Mark Charette 2006-08-17 17:44 
 Re: Backun Mouthpiece=Zinner Blanks  new
clarnibass 2006-08-17 18:16 
 Re: Backun Mouthpiece=Zinner Blanks  new
Julian 2006-08-17 19:09 
 Re: Backun Mouthpiece=Zinner Blanks  new
Ed 2006-08-17 21:32 
 Re: Backun Mouthpiece=Zinner Blanks  new
OpusII 2006-08-17 21:36 
 Re: Backun Mouthpiece=Zinner Blanks  new
Old Geezer 2006-08-18 16:05 
 Re: Backun Mouthpiece=Zinner Blanks  new
Mark Charette 2006-08-18 16:09 
 Re: Backun Mouthpiece=Zinner Blanks  new
L. Omar Henderson 2006-08-17 22:16 
 Re: Backun Mouthpiece=Zinner Blanks  new
David Spiegelthal 2006-08-17 22:34 
 Re: Backun Mouthpiece=Zinner Blanks  new
L. Omar Henderson 2006-08-17 23:22 
 Re: Backun Mouthpiece=Zinner Blanks  new
David Spiegelthal 2006-08-17 23:56 
 Re: Backun Mouthpiece=Zinner Blanks  new
EuGeneSee 2006-08-18 00:07 
 Re: Backun Mouthpiece=Zinner Blanks  new
Vytas 2006-08-18 00:25 
 Re: Backun Mouthpiece=Zinner Blanks  new
Vytas 2006-08-20 03:20 
 Re: Backun Mouthpiece=Zinner Blanks  new
Bill 2006-08-22 00:39 
 Re: Backun Mouthpiece=Zinner Blanks  new
Dan Paprocki 2006-08-18 00:52 
 Re: Backun Mouthpiece=Zinner Blanks  new
L. Omar Henderson 2006-08-18 01:02 
 Re: Backun Mouthpiece=Zinner Blanks  new
Gregory Smith 2006-08-18 02:05 
 Re: Backun Mouthpiece=Zinner Blanks  new
David Spiegelthal 2006-08-18 03:36 
 Re: Backun Mouthpiece=Zinner Blanks  new
L. Omar Henderson 2006-08-18 13:14 
 Re: Backun Mouthpiece=Zinner Blanks  new
David Spiegelthal 2006-08-18 15:42 
 Re: Backun Mouthpiece=Zinner Blanks  new
Alseg 2006-08-18 16:31 
 Re: Backun Mouthpiece=Zinner Blanks  new
L. Omar Henderson 2006-08-18 17:45 
 Re: Backun Mouthpiece=Zinner Blanks  new
David Spiegelthal 2006-08-18 18:10 
 Re: Backun Mouthpiece=Zinner Blanks  new
Sylvain 2006-08-18 18:25 
 Re: Backun Mouthpiece=Zinner Blanks  new
Brad Behn 2006-08-18 18:38 
 Re: Backun Mouthpiece=Zinner Blanks  new
L. Omar Henderson 2006-08-18 19:55 
 Re: Backun Mouthpiece=Zinner Blanks  new
Alseg 2006-08-18 20:00 
 Re: Backun Mouthpiece=Zinner Blanks  new
Tony Beck 2006-08-18 20:09 
 Re: Backun Mouthpiece=Zinner Blanks  new
David Spiegelthal 2006-08-18 20:24 
 Re: Backun Mouthpiece=Zinner Blanks  new
Alseg 2006-08-18 21:11 
 Re: Backun Mouthpiece=Zinner Blanks  new
David Spiegelthal 2006-08-18 22:16 
 Re: Backun Mouthpiece=Zinner Blanks  new
Ed 2006-08-18 23:56 
 Re: Backun Mouthpiece=Zinner Blanks  new
L. Omar Henderson 2006-08-19 00:19 
 Re: Backun Mouthpiece=Zinner Blanks  new
Alseg 2006-08-19 00:58 
 Re: Backun Mouthpiece=Zinner Blanks  new
David Spiegelthal 2006-08-19 02:17 
 Re: Backun Mouthpiece=Zinner Blanks  new
clarnibass 2006-08-19 05:40 


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