HomeRoast Digest


Topic: drum fill, effect on mixing (3 msgs / 43 lines)
1) From: dewardh
Dan:
<Snip>
Citation, please . . .
Deward
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2) From: Dan Bollinger
Sorry, don't have one, I just remembered the ratio when doing a search for
drum processing ideas.  Dan

3) From: Ken Mary
<Snip>
Go to your library and dig out Perry's Chemical Engineers Handbook. Look in
the section for gas-solid systems. Everything is there from rotary kilns to
spouted and fluidized beds. Different editions may have different info. In
the spouted bed section, there is data for coffee beans. It looks
interesting enough to me to try to build one.
The fill factor for rotating drums depends on the design. You do not want
beans spilling out the end of an open drum. Flights or lifting vanes will
allow a higher fill due to better mixing. Common non-coffee designs have
fills of 15% by volume. But coffee expands. Do you base the fill on green
volume or roasted? What amount of unevenness will you tolerate? Sounds like
trial and error to me.
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