Study may explain counterintuitive effect of why hotter systems can cool more quickly

phys.org ^ | October 23, 2017 | Lisa Zyga

[IronJack]

This actually poses an interesting conundrum. Since the rate of heat transfer is dependent on the temperature differential, if the goal is to freeze water, say, then the temperature to which the liquid water is exposed must be at least slightly lower than 32 degree F. Otherwise, the heat transfer rate would approach zero as the liquid being cooled approached freezing, so would never actually get there.

And that's ignoring the fact that as the hotter liquid cools, the cooler liquid heats up, and eventually the two reach an equilibrium. Unless the cooling liquid is periodically refreshed.

[IronJack]

This actually poses an interesting conundrum. Since the rate of heat transfer is dependent on the temperature differential, if the goal is to freeze water, say, then the temperature to which the liquid water is exposed must be at least slightly lower than 32 degree F. Otherwise, the heat transfer rate would approach zero as the liquid being cooled approached freezing, so would never actually get there.

And that's ignoring the fact that as the hotter liquid cools, the cooler liquid heats up, and eventually the two reach an equilibrium. Unless the cooling liquid is periodically refreshed.

[reed13k]

Well another way to look at is is accleration/velocity/distance vs heat transfer rate/temperature differential/temperature.

And we all know that gravity has an acceleration impact on masses based on the distance.... sooo....

I think its just that the difference is so great that the electrons ‘accelerate’ to the colder area. Since the acceleration will continue until another force acts on it then the change in temps between zones continues to increase at an increasing rate with the lower temp zone increase only slowing it down as a reactive force with a limited ability due to the lack of energy in that zone to begin with.

Sort of like when we do a pushup we push the world away an infintesimal amount in comparison to the amount that we push the lower mass of ourselves away. Perhaps the better comparison would be Temp to mass instead of temp to distance....

[Neoliberalnot]

There is a lot of energy that must be released when a liquid undergoes a phase change to a solid; this is why the change in temp in winter often seems to get stuck, or rather slows dramatically when It reaches the freezing point. Nevertheless, this has little to do with the ridiculous notion of the pnemba bull chit.

[HLPhat]

>>only if it adds another “proof” of global warming ...

QED Coherence and the Thermodynamics of Icecream - in the context of lactose intolerant methane generation as they apply to global warming.

There. Fund Me!

[Boogieman]

Well, that’s how fast the one driver can go. Didn’t say if the other driver had to do the same speed.

[Ozark Tom]

Water does not always freeze at 0 C or 32 F. Water under certain conditions may be super-cooled below the normal freeze point temperature, awaiting a stimulus to change phase.

Changing initial conditions can change an outcome, even if the mechanism behind the alternative result is obscure.

https://www.youtube.com/watch?v=ph8xusY3GTM

[rgboomers]

I have tried it. The cold water made ice cubes first.