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Author Topic: Is there a word for fast, violent evaporation?  (Read 1156 times)

Offline thedoc

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David Card asked the Naked Scientists:
   I understand that "Evaporation" is a slow and non violent process. Last night my Daughter made Pancakes and when she ran the frying pan under the tap, there was an extremley violent reaction and the water just dis-appeared, I grasp the Science behind it, but is there a word to describe this or is it just "vapourisation?
thanx
Davie
What do you think?
« Last Edit: 30/10/2015 18:50:02 by _system »


 

Offline chiralSPO

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Re: Is there a word for fast, violent evaporation?
« Reply #1 on: 30/10/2015 21:05:28 »
I am unaware of any single word that describes the phenomenon, though I have certainly heard of "explosive evaporation"

I don't think there is any fundamental difference between violently fast boiling and "normal" boiling.
 

Online evan_au

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Re: Is there a word for fast, violent evaporation?
« Reply #2 on: 30/10/2015 21:58:26 »
In this case, the water was only confined by its own inertia. The cold water had to be (relatively) slowly raised to boiling point via heat conduction.

However, dramatic "BLEVE" events can occur if a boiling liquid is held in a pressurized container, and the pressure suddenly released, simultaneously flashing the entire liquid into vapor. In this case, the liquid is not slowly raised to boiling point, as the pressurized liquid is already well above the boiling point of this liquid at atmospheric pressure.
http://en.wikipedia.org/wiki/Boiling_liquid_expanding_vapor_explosion

Mythbusters have filmed several episodes on this:

Do not try this at home!
« Last Edit: 30/10/2015 23:30:27 by evan_au »
 

Offline Bored chemist

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Re: Is there a word for fast, violent evaporation?
« Reply #3 on: 31/10/2015 13:17:10 »
This?
Bumping
« Last Edit: 01/11/2015 03:59:36 by evan_au »
 

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Re: Is there a word for fast, violent evaporation?
« Reply #3 on: 31/10/2015 13:17:10 »

 

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