Does stirring or any other motions, help to cool off a hot liquid?

Question

i understand that having a wider bowl will cool a hot liquid faster what with the larger surface area. but we all know we don't have that privilege esp. when we are outside.

so my question is will stirring a soup for example cool it off faster? is there any empirical evidence to back up a claim?

Answer 1

This is the simple answer ::
Yes, but by much!
If the spoon is ice cold or even room temp it will cool off the spoonful a bit! Blowing on the bowl (or spoonful) will also cool it off a little.
If you're trying to cool it off quickly put ice cubes in a zip lock baggie and immerse!
.

Answer 2

Yes, stirring a hot liquid will help it cool faster.

Part of the equation for heat transfer to/from a fluid is the flowrate of the fluid over the heat sink/source. So, the more you stir the hot liquid, the more it flows over the surface of the bowl. So, the rate of heat transfer out of the sides of the bowl will be greater than if the liquid was not moving.

Conversely, stirring a pot of liquid on a hot stove will increase the rate of heat transfer to the liquid. Then again, you lose a lot of that heat by evaporation with the lid off. So, when heating a liquid that won't burn (like water), it's fastest when you do so in a pot with a lid on it.

Answer 3

yeah i suppose because while the liquid is moving the heat can escape from it, like (ok this is not the best example so i apologise lol) if your laying in bed with the duvet over you, if you stay still the heat stays in but if you move around a lot you stay cooler!