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Mon84
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Joined: 21 Apr 2014
Posts: 4
Location: UK
Expertise: I love coffee

Posted Mon Apr 21, 2014, 5:33pm
Subject: Ultrasonic Brewing
 

Hi All

Apologies if this has been discussed before ,search didn't turn up anything...

I am looking into ultrasonic mixing to create cold brew coffee, although without the required 8-12 hours, I'm hoping with additional agitation this can be reduced.
I have experimented with 44Khz 60w ultrasonic transducer but it appears the frequency is to high, I have since ordered a lower 28Khz transducer and driver circuit.
Links:
Video 44Khz
Photo of transducer and driver circuit

Anyway just wondering if anyone has tried this before? , and any thoughts and or suggestions.
Look forward to hearing the forums thoughts.
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Mon84
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Joined: 21 Apr 2014
Posts: 4
Location: UK
Expertise: I love coffee

Posted Wed Apr 23, 2014, 1:26pm
Subject: Re: Ultrasonic Brewing
 

No replies , maybe my idea is just that crazy ?

Any thoughts suggestions would be appreciated even if it's just to reassure me I'm sane and not a crazy scientist :p
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wabbitt
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wabbitt
Joined: 2 Jan 2010
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Posted Wed Apr 23, 2014, 3:47pm
Subject: Re: Ultrasonic Brewing
 

Nice try at a novelty idea, but I think it's useless.  A little transducer is going to do as much for your coffee as serenading the coffee jar with a radio.  You could get more agitation by placing the cold brew on top of a loud bass speaker and play something with a beat.  That might be followed by a visit from an equally agitated neighbor.  Offer him a cup of awesome coffee & biscuit.

My intuition says tu use much lower frequency, like 2 cycles per minute and much more distance/travel.  At first I thought more toward something around the frequency and intensity of a paint mixer.  If you add cream, you could have a coffee whip.  Nah, that's overkill.

How about one of those baby swings to gently sway your jar for a few hours. Some of those swings are a kinetic wind-up thing.  I've seen a bar novelty that would rock from side to side, so that whatever was in the barrel would agitate  as it rolled from one side to the other.  The little barrel was the size of a pickle jar.

When I had high school chemistry, we had this little thing the size of a bean which would magnetically stir the beaker.

When I do a jar of cold brew, I just shake up the jar every couple hours if/when I happen to be within arms reach just to let it know it is loved. One of the benefits to cold brew is the very small energy footprint it leaves, smaller than manual drip, even.
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rasqual
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rasqual
Joined: 29 Jun 2005
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Posted Wed Apr 23, 2014, 5:14pm
Subject: Re: Ultrasonic Brewing
 

How about one o' them hardware store paint-shakin' machines?    ;-D

Heck, a decent blender...

How about those cold beverage machines they use to dispense stuff in some restaurants? Their designs vary. Some have mechanical agitators, some have fluid flowing over the top. A mod or two could make an interesting brewing device for cold/cool/tepid/lukewarm/warm brewing. 32
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CoffeeRoastersClub
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Posted Wed Apr 23, 2014, 5:28pm
Subject: Re: Ultrasonic Brewing
 

Mon84 Said:

No replies , maybe my idea is just that crazy ?

Any thoughts suggestions would be appreciated even if it's just to reassure me I'm sane and not a crazy scientist :p

Posted April 23, 2014 link

A company in Germany produces ultrasonic mixers used in a variety of applications, one being food:
Click Here (www.hielscher.com)

Pretty industrial looking stuff, however maybe you can glean some good info on what they are doing, frequencies involved, etc.

Len

 
"Coffee leads men to trifle away their time, scald their chops, and spend their money, all for a little base, black, thick, nasty, bitter, stinking nauseous puddle water." ~The Women's Petition Against Coffee, 1674

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Mon84
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Joined: 21 Apr 2014
Posts: 4
Location: UK
Expertise: I love coffee

Posted Thu Apr 24, 2014, 1:17am
Subject: Re: Ultrasonic Brewing
 

Thanks for the input guys.

wabbitt
I fear you may be right on the frequency, although thats not stopping me from trying.
My understanding is with cold brew it is the water extracts the water soluble parts from the coffee and this is diffused through the water.
Agitation should increase the diffusion and make the coffee more uniformly distributed among the liquid, hopefully this will reduce the coffee concentration immediately around the coffee grounds and increase the rate of extraction?

rasqual
Indeed i'm sure the paint mixers would increase the extraction rate although not sure I can convince the Mrs to put one in the kitchen... :P
I'm not familiar with the design of commercial machines.. so can't really comment.

CoffeeRoastersClub
Thanks , I have seen that article and my quest into ultrasonics was actually through looking at that site and using it in Biodiesel production, which I believe Hielscher use around 20Khz, although I can't seem to find the reference back too this.


An interesting article seems to support that I'm on the right track dropping the frequency to 28Khz, although to achieve a rapid cold brew make be asking too much?
APPLICATION OF ULTRASOUND THERMAL PROCESS ON EXTRACTING FLAVOR AND CAFFEINE OF COFFEE
Ultrasonics used in biodiesel reduce the reaction time by a factor of 100 compared to mechanical mixing, although this is pure chemistry I'm hoping some of this theory will transfer.

I appreciate all the feedback/thoughts and open to any suggestions that may improve the extraction rate and or taste.
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