No, the constriction is *before* the heater so the pressure only increases
there.  This also decreases pump effichiency and this is why you get a lower
airflow.

    KreAture

----- Original Message -----
From: "Josh Koffman" <listsjosh@3MTMP.COM>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Sunday, February 02, 2003 4:04 AM
Subject: Re: [EE]: SMT soldering


> I think that was my point...by slightly constricting the tube, you would
> get a higher pressure through the heat exchanger, but lower flow.
> Therefore, wouldn't the air going through linger longer in the exchanger
> and pick up more heat?
>
> Josh
> --
> A common mistake that people make when trying to design something
> completely foolproof is to underestimate the ingenuity of complete
> fools.
>         -Douglas Adams
>
> Kyrre Aalerud wrote:
> >
> > Flow is the result of the inverse relationship between pressure and
> > resistance.  Thus, reducing pressure will reduce flow, reducing
resistance
> > will increase flow *and* reduce overall pressure.
> >
> > Try blowing through a pipe with your hand covering half the end.  Now do
it
> > again without the blocking.  You can use same ammount of force to move
air
> > through, but you will experience less pressure without the block, and
higher
> > flow.
>
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