Sound increases the efficiency of boiling

Scientists at the Georgia Institute of Technology achieved a 17-percent increase in boiling efficiency by using an acoustic field to enhance heat transfer. The acoustic field does this by efficiently removing vapor bubbles from the heated surface and suppressing the formation of an insulating vapor film.

As reported in the American Institute of Physics' (AIP) journal the Physics of Fluids, bubble removal was enhanced because the acoustic field induces capillary waves on the bubble, causing its contact line to contract and detach the bubble from the surface.

The mechanisms associated with these interactions were explored using three acoustic experiments: an air bubble on the underside of a horizontal surface, a single vapor bubble on the top side of a horizontal heated surface, and pool boiling from a horizontal heated surface.

The researchers were able to isolate and identify the dominant forces involved in these acoustically forced by measuring the capillary waves induced on the bubbles, bubble motion, and heat transfer during boiling.


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More information: Acoustically Enhanced Boiling Heat Transfer, by Zachary Douglas et al. Physics of Fluids, 2012.
Journal information: Physics of Fluids

Citation: Sound increases the efficiency of boiling (2012, May 24) retrieved 19 July 2019 from https://phys.org/news/2012-05-efficiency.html
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May 24, 2012
Ummm.... I know other people who have used this technique. Nothing new here.

KBK
May 26, 2012
This technique was used int he production of HHO gas, or Brown's gas, a few years back. the researcher reported a VERY large increase in the production efficiency of Brown's gas (HHO, or Rhodes gas-official name). Of course he was lambasted.

But .....now it's real.

Before 'science' proves something exists, it can indeed and usually does exist. Science does not create, it only provides a backdrop of quantization, etc. People create, via rumination from observation, and then their acting on such.

Thus, before 'science' comes reports in the field. Whether people believe those reports or not.


May 28, 2012
old news, saw it demonstrated at the royal Christmas lectures when i was a kid. maybe 20 odd years ago

May 29, 2012
This technique was used int he production of HHO gas, or Brown's gas, a few years back. the researcher reported a VERY large increase in the production efficiency of Brown's gas (HHO, or Rhodes gas-official name). Of course he was lambasted.

Just thought I'd point out that Brown's gas doesn't actually exist, so naturally any researcher who went around crowing about making it would be lambasted. Also, you don't have to be a scientist to figure this out. Somebody claiming that they can produce a flame that melts metal but doesn't burn their hand is clearly a crank.

May 29, 2012
Why We Have So Much "Duh" Science... Apparently, the overemployment and lack of money in physics contributes to the triviality of contemporary research. Maybe the above publication really contains some new insights - but after then the author of article failed to explain it the readers.

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