<html><head><style type='text/css'>p { margin: 0; }</style></head><body><div style='font-family: Arial; font-size: 12pt; color: #000000'>Frank and list:<br><br> Need to bring in one more variable: fuel shape. Imagine the fuel is pencil shaped. If placed vertically, they work fine to make char. If horizontal and parallel, they can block most vertical air flow. Anyone able to supply biomass fuel spheres?<br><br>Ron<br><br><hr id="zwchr"><b>From: </b>"Frank Shields" <frank@compostlab.com><br><b>To: </b>"Discussion of biomass cooking stoves" <stoves@lists.bioenergylists.org><br><b>Sent: </b>Tuesday, May 7, 2013 2:46:13 PM<br><b>Subject: </b>Re: [Stoves] Charcoal as space filler in TLUD reactors<br><br>Dear Martin, <br><br>I often determine the particle density here in the lab using free flowing<br>sand. If the particle density of the fuel is determined (g/cc) and you know<br>the weight of fuel packed in a known volume you know the volume of voids and<br>can determine the air speed - I am thinking. <br><br>Frank<br><br><br><br><br>-----Original Message-----<br>From: Stoves [mailto:stoves-bounces@lists.bioenergylists.org] On Behalf Of<br>ajheggie@gmail.com<br>Sent: Tuesday, May 07, 2013 1:26 PM<br>To: Discussion of biomass cooking stoves<br>Subject: Re: [Stoves] Charcoal as space filler in TLUD reactors<br><br>[Default] On Tue, 7 May 2013 09:22:19 +0200,"Boll, Martin Dr."<br><boll.bn@t-online.de> wrote:<br><br>>You have to calculate the free space in order to get the real air-speed in<br>this area.<br>>I think even if that is naturally not the true surface-speed on the fuel,<br>it is a good number to deal with.<br><br>I think in gasification they use the term "superficial velocity" a fictional<br>speed derived from the air volume and cross section of the chamber, the<br>actual speed of any given bit of air flow through the spaces will be much<br>higher of course.<br><br>AJH<br><br>_______________________________________________<br>Stoves mailing list<br><br>to Send a Message to the list, use the email address<br>stoves@lists.bioenergylists.org<br><br>to UNSUBSCRIBE or Change your List Settings use the web page<br>http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylists<br>.org<br><br>for more Biomass Cooking Stoves, News and Information see our web site:<br>http://stoves.bioenergylists.org/<br><br><br><br>_______________________________________________<br>Stoves mailing list<br><br>to Send a Message to the list, use the email address<br>stoves@lists.bioenergylists.org<br><br>to UNSUBSCRIBE or Change your List Settings use the web page<br>http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylists.org<br><br>for more Biomass Cooking Stoves, News and Information see our web site:<br>http://stoves.bioenergylists.org/<br><br></div></body></html>