# boundary condition

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January 3, 2011, 20:36
boundary condition
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Please help, I am intending to model a static combustion process of carbon powder. First I am trying to simulate the mixing process of the carbon powder that put into the small cap inside the chamber attached and the oxygen by using a multiphase model. The problem is that I don't know how to define the mass (kg) of powder to be put in the cap, so it is highly appreciated if anyone can give me a hint to do so.
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 combustion chamber.JPG (36.1 KB, 4 views) sectional view of combustion chamber.JPG (56.8 KB, 2 views)

 January 3, 2011, 22:31 #2 Senior Member   Real Name :) Join Date: Jan 2010 Location: United States Posts: 180 Rep Power: 7 The mass of the powder will be determined by the volume of the cap divided by the density of the carbon powder. If the cap is 2 cm^3, and assuming the density of carbon powder (with 0 porosity) is ~2 g/cm^3, you'd have 2 g of powder. Of course, if you have a maximum packing limit of something other than 1 (~0.74 for HCP), the mass will be fractionally decreased by 1 minus the packing limit. ComputerGuy

 January 6, 2011, 19:57 #3 New Member   Join Date: Mar 2010 Posts: 12 Rep Power: 7 computerguy thanks a lot for your reply and what I mean is the type of boundary condition I have to use in gambit? thanks for your help blaid Last edited by blaid; February 3, 2011 at 10:56.

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