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Post by sierramog on Mar 12, 2013 16:52:28 GMT -8
Hi folks, I am going to a Comsol Multiphysics demo tomorrow and hope to learn how to model some of Peters models shown above in computational fluid dynamics within the two week free download period. Other than shown in this thread are there parameters I should know so I can ask good questions? Thanks! |
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Post by peterberg on Mar 13, 2013 2:00:15 GMT -8
I am going to a Comsol Multiphysics demo tomorrow and hope to learn how to model some of Peters models shown above in computational fluid dynamics within the two week free download period. Other than shown in this thread are there parameters I should know so I can ask good questions? Mog, That would be awesome! Please take the cast model if at all possible, that's the most accurate. One of the parameters is the negative pressure of the chimney. In my case, that would be an average of 0.06 millibar to start with. During the run, that could rise up to 0.20 millibar. I haven't got any numbers for the intake, only square millimeters. That would be for the main inlet 2500 mm2, p-channel 896 mm2. Of course a neutral pressure on that side. Take into account that the temperature would rise from 20 C. inlet to 1000 C. in the riser. Air would expand about 4 times in that trajectory. Water would expand much, much more, about 500 times. When you are accounting for 15% moist in the fuel itself, there's also water vapor, one of the by-products of burning wood gas. That could be as much as 600 grams for every kg of dry wood, as far as I know. Could be a little bit too complicated. To make it simple, I would be curious about the gas streams in particular. |
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Post by Deleted on Mar 13, 2013 7:21:37 GMT -8
Water vapour would expand much, much more, about 500 times. Aktually much more. The result of the law of Avogadro is about 1200 times, which is valid at 0 °C = 273,15 K und 1013,25 hPa. At 100°C it is already about 1670 times. I am to lazy to calculate it for higher degrees. The law of Avogadro would allow to calculate the expansion of wood by combustion quite easy, provided the resulting gases and the remaining ash are known. |
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Post by sierramog on Mar 14, 2013 8:29:38 GMT -8
... Mog, That would be awesome! Please take the cast model if at all possible, that's the most accurate. Peter, I have a personal delay  I have to deal with for a couple weeks so COMSOL has graciously made the demo available to me at a more convenient time window  Will let you know when I am able to dig into it. Thanks for the additional detail! Paul |
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I have to deal with for a couple weeks so COMSOL has graciously made the demo available to me at a more convenient time window 