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Old 11-24-2008, 10:02 PM   #1
Darwin18
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Default Convection Current

I've looked on the forums here but haven't seen this addressed. My beer has been in primary for a few days bubbling away happily. Looking at it, I can see particles in the beer rising up, down, and all around in a convection current. The fermentor is room temperature at 65 degrees with a towel wrapped around it as an insulator.

Is this convection current normal? I'm merely curious, not concerned.
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Old 11-24-2008, 10:08 PM   #2
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Very normal. fermentation is an exothermic reaction (heat is produced).

some fermentations are quite violent:
(random youtube video of a carboy fermenting actively)
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Old 11-24-2008, 10:13 PM   #3
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Thank you Malkore! I find it fascinating but my SWMBO had a....different reaction.
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Old 11-24-2008, 10:33 PM   #4
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Its not just fluid convection, its also Co2 gas nucleation, growth of bubbles and release of co2 at the surface - letting particles fall again.
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Old 11-24-2008, 10:55 PM   #5
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