Date: Fri, 28 Jun 2002 17:08:56 -0500
Reply-To: wilden1@JUNO.COM
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Stan Wilder <wilden1@JUNO.COM>
Subject: Re: Humid Air - Some Comments
Content-Type: text/plain; charset=us-ascii
Darn Frank! that thing below is wonderful.
I thought that the Mr. Wizard series of books was out of print but I see
you've secured a set to work from.
Stan
On Fri, 28 Jun 2002 17:45:46 EDT Frank Grunthaner <FrankGRUN@AOL.COM>
writes:
> What a great day for culture on the list! Avogadro's number and
> Vanagon in
> the same dissertation! There is hope for our society yet. Even the
> mere
> mention of the mole was gave a tingle in the cranium surprisingly
> similar to
> an ounce of Cointreau on ice.
>
> Nonetheless, Stan, Ed and Arlan are all quite correct ... humid air
> is less
> dense than dry. Also, the extraction or heat transfer ability of the
> flowing
> gas is related primarily to temperature and secondarily to velocity
> , then to
> turbulence and finally to macroscopic porosity or surface area per
> unit areal
> dimension.
>
> However, this is not the case when the water has not been fully
> atomized.
> Small water droplets (can range from nanoclusters to sub-mm
> aerosols) offer
> the ability to volatilize (get to use the heat of vaporization).
> This can
> significantly enhance net thermal transport and reduce chamber
> detonation.
> Taken to the extreme, a thin layer of water (2 to 4 monolayers) on
> the
> radiator surface at the turbulent air boundary will give superb heat
> transfer
> . Of course, one needs to keep the water film thickness below the
> level where
> the bulk thermal conductivity of the water would dominate. Such
> thickness
> control is generally beyond the ability of most practitioners of
> the
> automotive arts!
>
> BTW a thin film of Cointreau would work wonderfully as well; what a
> fine
> aroma, but what a waste.
>
> Have a chemically interesting day!
>
> Frank Grunthaner
>
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