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Joined: Jan 2003
Posts: 20
Fingerling
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OP
Fingerling
Joined: Jan 2003
Posts: 20 |
Will aeration increase or decrease evaporation in the summer?. I am thinking moving water interacts with air more readily but that cooler water coming up from the bottom will not evaporate as quickly. any thoughts?
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Joined: Jan 2009
Posts: 28,502 Likes: 827
Moderator Ambassador Field Correspondent Lunker
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Moderator Ambassador Field Correspondent Lunker
Joined: Jan 2009
Posts: 28,502 Likes: 827 |
Will aeration increase or decrease evaporation in the summer?. I am thinking moving water interacts with air more readily but that cooler water coming up from the bottom will not evaporate as quickly. any thoughts? I normally don't worry about it. If there's not enough O2 in the water, and fish don't have enough to survive, then how much water is a moot point. If water is too warm, evaporation also cools the water.
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Joined: Jan 2003
Posts: 20
Fingerling
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OP
Fingerling
Joined: Jan 2003
Posts: 20 |
I wasn't suggesting it should impact the decision as to whether to aerate or not, although if reducing the heat of the surface level water molecules would reduce evaporation, that would be a good thing. Certainly possible the impact is insignificant. Just curious and wondering whether anyone knew.
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Joined: Jun 2007
Posts: 7,099 Likes: 23
Ambassador Field Correspondent Hall of Fame Lunker
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Ambassador Field Correspondent Hall of Fame Lunker
Joined: Jun 2007
Posts: 7,099 Likes: 23 |
Cooler water will actually evaporate faster in warm/hot dry air, just as warm water freezes faster in cold air due to the temperature spread. The "boil" of bottom diffused air will cause cool water to evaporate faster.
The heat transfer rate is proportionally faster the wider the temperature differential is. The small bubbles of the diffused air that help lift water also provide a huge surface area for the heat to transfer rapidly.
Last edited by Rainman; 09/28/15 12:13 PM.
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Joined: Apr 2002
Posts: 15,139 Likes: 487
Moderator Ambassador Field Correspondent Lunker
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Moderator Ambassador Field Correspondent Lunker
Joined: Apr 2002
Posts: 15,139 Likes: 487 |
I'm not convinced that warm water freezes faster than cold water. When a tray of warm water and 'cold' water are placed in the freezer the warm water tray can freeze faster, but this is due to the warmer water caused melting below it and tray makes better contact the freezer than the cold water tray. Heat in water can be measured in calories. Heat calories have to be lost or removed for water to freeze. Warm water has more heat calories than colder water. Those heat calories have to be removed to the point the water freezes. The more heat calories there are the longer it takes to remove those calorie units and freezing occurs. The same principle should apply to water evaporation. See into in this link. http://www.physlink.com/Education/AskExperts/ae7.cfmHere is an interesting discussion on water evaporation: https://van.physics.illinois.edu/qa/listing.php?id=1474Cold water vs warm water evaporation https://van.physics.illinois.edu/qa/listing.php?id=16382
Last edited by Bill Cody; 09/28/15 01:43 PM.
aka Pond Doctor & Dr. Perca Read Pond Boss Magazine - America's Journal of Pond Management
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Joined: Jun 2007
Posts: 7,099 Likes: 23
Ambassador Field Correspondent Hall of Fame Lunker
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Ambassador Field Correspondent Hall of Fame Lunker
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Posts: 7,099 Likes: 23 |
with all things being equal, cold water will freeze faster. But throw near boiling water into freezing air, and being less dense, and having a wide temp differential, ice crystals form as the water falls. Toss cold water into the air, and it lands wet.
It comes down to the surface area, density, and the temperature differential.
Last edited by Rainman; 09/28/15 01:44 PM.
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Joined: Apr 2002
Posts: 15,139 Likes: 487
Moderator Ambassador Field Correspondent Lunker
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Moderator Ambassador Field Correspondent Lunker
Joined: Apr 2002
Posts: 15,139 Likes: 487 |
Here is more info that reinforces Rainman's statement of warm freezing faster than cold. Water is a unique substance. https://medium.com/the-physics-arxiv-blo...ct-d8a2f611e853
aka Pond Doctor & Dr. Perca Read Pond Boss Magazine - America's Journal of Pond Management
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