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- Newsgroups: sci.engr.mech
- Subject: Re: Warm water freezes first. why?
- Message-ID: <1992Dec17.162456.214@janus.arc.ab.ca>
- From: morgan@arc.ab.ca (Sean Morgan)
- Date: 17 Dec 92 16:24:55 MDT
- References: <1992Nov29.134223.7081@aio.jsc.nasa.gov> <1fliu2INNeou@usenet.INS.CWRU.Edu> <1flklaINNg2l@usenet.INS.CWRU.Edu>
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- Organization: Alberta Research Council
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- In article <1flklaINNg2l@usenet.INS.CWRU.Edu> sxs@r2d2.eeap.cwru.edu (Soheil
- Sayeh) writes:
- >This question is actually asked in one of the Heat Transfer classic text
- books.
- >I belive it was Holman. This is what I think:
- >
- >The combined effect of higher temperature gradient and evaporation is the
- cause.
- >because of low temperature in the freezer the air is extremely dry, so the hot
- >water starts to evaporate, and at the same time it cools down. what happens is
-
- >,we are freezing less amount of water in the warm tray. and the amount of
- >heat requred to do it is less than the cold tray.
- >
- >I hope I could explain clearly what I meant.
- >
- >have a good one,
- >
- >Soheil.
-
- Yes, would INITIALLY have a higher temperature gradient, but after a few hours
- the warm water would be where the cold water was to start with!
-
- I thought it was because there are fewer dissolved gases in the warm water.
- Now how that affects the cooling rate, I don't know. Can't see how it would
- reduce the specific heat very much.
- -----------------+-------------------------------
- Sean Morgan | ALBERTA 6815 - 8 Street N.E.
- | RESEARCH Calgary, AB, Canada
- morgan@arc.ab.ca | COUNCIL T2E 7H7
-
-