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 Fluidbed Bean Spouting Changes
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| CharcoalRoaster |
Posted on 10/13/2018 1:15 PM
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 1 1/2 Pounder  Posts: 616 Location: Chattanooga, TN Joined: April 13, 2012 |
I've noticed something interested with my FB roaster that just dawned on me during my roast today. At the beginning of the roast my beans spout and recirculate right up the center. However, as air heats up, beans lose moisture, the roast progresses the bean mass begins to spout and recirculate from the side along one of the bakearound walls. My roasts aren't negatively affected ( I don't think). Anyone know why the bean mass would change spouting locations during the roast? |
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| snwcmpr |
Posted on 10/14/2018 10:30 AM
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 1 1/2 Pounder Posts: 920 Location: Western NC Joined: March 03, 2011 |
My Bake-A-Round style roaster has air come up on the side, the 'other' side is an angled plate, so mine always circulate UP one side -- ACROSS -- DOWN the other side. See Allens 1 lb build, that is my roaster. The only variation I notice is that the beans fly higher as the roast continues, and in 1C they go even higher, until they cool down. --------------
Backwoods Roaster "I wish I could taste as well as I wish I could roast." As Abraham Lincoln said "Do not trust everything you read on the internet". |
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| ChicagoJohn |
Posted on 10/14/2018 12:58 PM
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 Pounder  Posts: 511 Location: Chicagoland Joined: June 15, 2015 |
I have a 5" diameter glass cylinder and notice the effect you are describing where they spout up the center and back down the sides initially and then change type of motion as bulk density decreases. In mine, the entire bean mass tends to bounce up and down as pressure builds and is released, but I think the details would depend upon the symmetry of the air flow in the RC. I can't imagine there would be an effect in large enough to significantly affect the uniformity of a roast. So many beans; so little time.... |
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| Sinobi |
Posted on 02/09/2019 3:17 AM
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 Newbie  Posts: 18 Location: Joined: October 21, 2018 |
I have noticed this as well. Spouting in the center in the beginning Later on spouting up the side wall of the glass. Sometimes the sidewall up-spouting location moves randomly around during the last half of the roasting session and also centers from time to time. At other times (meaning in other roast sessions) it stays at the same side instead of moving around randomly. I suspect that when it stays on one side, it is because the glass is tilted slightly to one side, and when it moves around randomly it is because the glass and the airflow direction is balanced. But why it doesn't stay in the middle center all the time has made me wonder many times... |
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| greencardigan |
Posted on 02/10/2019 6:43 PM
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 1 1/2 Pounder Posts: 1142 Location: Australia Joined: November 21, 2010 |
It depends on the geometry of the roast chamber I think. My smaller roasters have the changing circulation as described, but my bigger 6" diameter one doesn't. Maybe the ratio between the chamber diameter and perforated diameter? My thought: The flow up the wall is probably the path of least resistance (no adjacent beans returning in the opposite direction). When the bed depth gets taller, the spout has greater length to wander around, and when it hits the edge it usually stays there. |
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| Ooij01 |
Posted on 07/28/2019 8:48 AM
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Newbie Posts: 21 Location: Joined: June 25, 2018 |
I also notice this happening on my roaster which has a 10cm diameter but never gave it much thought. |
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