encroaching on NAC!! Fwd: Re: windshield fluid sprayer

[Chris Dyer]

What if my sunroof's open?  And there's a hole in my wastegate?

from chrisdyer at hotmail.com



>From: Brett Dikeman <brett at cloud9.net>
>To: Robert Myers <robert at s-cars.org>,        "Phil Payne"
><quattro at isham-research.com>, <duane at zk3.dec.com>,        "Quattro List"
><quattro at audifans.com>
>Subject: Re: windshield fluid sprayer
>Date: Fri, 30 Nov 2001 11:52:17 -0500
>
>At 4:17 PM -0500 11/29/01, Robert Myers wrote:
>>--
>>Bullpucky, Phil.  Absolute nonsense.  The colder sample freezes
>>first.  There is simply no way around thermodynamics.
>
>There's simply no way around thermodynamics, but there's nothing
>simple about thermodynamics when it comes to something wacky like
>this :-)  You're assuming temperature is the only factor.
>
>>   The hot sample must
>>first lose heat to reach the starting temperature of the colder
>>sample.  This takes time during which the colder sample has reached a
>>lower
>>temperature and/or has started already to freeze.
>>
>
>There are a variety of effects at work, and some conditions to be
>met, but the near-boiling container will freeze first if both are
>a)uncovered and b)"outside"(I suspect some of the effects below would
>not properly work given a finite amount of air easily saturated with
>moisture) then:
>
>a)the hot water container will loose a substantial amount of heat and
>mass due to evaporation(phase change=massive energy loss)
>b)a skin of ice will form over the cooler container insulating it
>c)the hotter water will get supercooled(Huw mentioned this) so it
>will drop in temperature faster
>
>
>Cover both containers and its a different ball game; there's no loss
>due to evaporation nor phase change, but you still have the
>supercooling effect.
>
>B
>--
>----
>"They that give up essential liberty to obtain temporary
>safety deserve neither liberty nor safety." - Ben Franklin
>http://www.users.cloud9.net/~brett/
>http://www.users.cloud9.net/~brett/bdikeman.asc	(PGP Public Key)


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