[DVBC] Physics question

[Chaga, Debra]

I think that if Bob were to put on say 35 to 50 pounds then maybe he'd
produce more body heat which would radiate towards his bottles and they
wouldn't freeze up so fast.
Debbie

-----Original Message-----
From: dvbc-list-bounces at list.dvbc.org
[mailto:dvbc-list-bounces at list.dvbc.org] On Behalf Of Doug Bower
Sent: Monday, January 22, 2007 12:05 PM
To: dvbc-list at dvbc.org
Subject: RE: [DVBC] Physics question

Dave,

Javier is correct.  If you look at the heat transfer formula, heat
transfer is a function of the Delta temperature between one medium and
the other times the velocity of the material times the surface area of
the transfer area and last but not least the heat transfer of the
material(known as K, how well a plastic bottle transfers heat).  The
surface area of Bob's bottle is fixed, the delta temp is somewhat fixed
but the velocity between the water and air is a variable.  Basically
anything to increase velocity of the air or water will increase heat
transfer.  But this will only speed up the freezing and not affect the
temperature at which Bob's bottle froze.  

Dave, Stick to cell phones. :)


 
-----Original Message-----
From: dvbc-list-bounces at list.dvbc.org
[mailto:dvbc-list-bounces at list.dvbc.org] On Behalf Of Pazos, Javier
Sent: Monday, January 22, 2007 10:56 AM
To: dvbc-list at dvbc.org
Subject: RE: [DVBC] Physics question

A. Your proposal still involves physics.
B. Agitation would increase the surface area of the liquid, accelerating
heat transfer, causing it to freeze faster.

-----Original Message-----
From: dvbc-list-bounces at list.dvbc.org
[mailto:dvbc-list-bounces at list.dvbc.org]On Behalf Of Dave Hartrum
Sent: Monday, January 22, 2007 10:31 AM
To: dvbc-list at dvbc.org; Bob LaDrew
Subject: Re: [DVBC] Physics question


I would like to propose that physics had nothing to do with it.
I think it was Bob's fast and smooth riding form that made his freeze
first.
If you ride smoother with less agitation of the water it will freeze
faster.


Dave Hartrum
dhartrum at mac.com



On Jan 21, 2007, at 4:31 PM, Bob LaDrew wrote:

>    For today's ride I warmed up my bottle so it would go longer 
> without freezing. Bill used cold water in his. Mine froze right up and

> Bill was able to drink out of his the entire ride.
>    What is the operative law of physics at work here?
>    Dougie, you wanna field this one?
>    --Bob LaDrew
>
> _______________________________________________
> DVBC mailing list
> DVBC at list.dvbc.org
> http://list.dvbc.org/mailman/listinfo/dvbc-list


_______________________________________________
DVBC mailing list
DVBC at list.dvbc.org
http://list.dvbc.org/mailman/listinfo/dvbc-list



_______________________________________________
DVBC mailing list
DVBC at list.dvbc.org
http://list.dvbc.org/mailman/listinfo/dvbc-list



_______________________________________________
DVBC mailing list
DVBC at list.dvbc.org
http://list.dvbc.org/mailman/listinfo/dvbc-list