Does stirring water help bring it to boil faster?

  • Thread starter AHVincent
  • Start date
17
0
Is it faster to leave the pot alone until it boils or to stir it every few minutes to increase convection?

This is for a very large pot of over 50 litres using a 50 000 BTU commercial gaz burner at full power.
 

sophiecentaur

Science Advisor
Gold Member
23,510
3,931
You would expect faster heat transfer from flame to water when the temperature difference is high. So stirring the water (forced convection) will keep water with lower temperature in contact with the walls of the pan and should ensure more heat goes into the water and less is wasted into the surrounding air.
 

cjl

Science Advisor
1,726
331
My guess is that natural convection will mix it reasonably well in the first place, so there won't be much of a difference. You could always try it as an experiment (all you need is a stopwatch), and let us know the results...
 
And weren't Joule's experiments done by stirring a fluid? Ideally the heat generated by stirring the pot would be added to the heat from the element, I know it would be very small, but that would also shorten the time to boiling.
 
803
8
The stirring element might take some of the heat from the water. Waves caused by the stirring might also increase heat loss...and ultimately, you probably have to take the cover off to stir it.

I say just let it be.
 

Related Threads for: Does stirring water help bring it to boil faster?

Replies
1
Views
4K
Replies
1
Views
7K
Replies
6
Views
1K
Replies
5
Views
855
  • Posted
2
Replies
30
Views
36K
Replies
34
Views
15K
Replies
18
Views
21K

Physics Forums Values

We Value Quality
• Topics based on mainstream science
• Proper English grammar and spelling
We Value Civility
• Positive and compassionate attitudes
• Patience while debating
We Value Productivity
• Disciplined to remain on-topic
• Recognition of own weaknesses
• Solo and co-op problem solving
Top