# Vacuum in the furnace

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 February 8, 2011, 12:10 Vacuum in the furnace #1 New Member   Join Date: Aug 2009 Posts: 10 Rep Power: 10 Sponsored Links Question about lesson Chapter 30: Coal Combustion, you want to specify a vacuum in the furnace. In the example, the initial conditions are: Through Coal Inlet air is supplied 1.015e-3 kg / s Through Air Inlet air is supplied 1.035e-2 kg / s At the outlet Outlet average static pressure = 0 Pa How to set the boundary conditions (on Air Inlet and Outlet) to a pressure drop and air flow corresponded to the original value. Tried a bunch of options obtained by either an error or a decision not to converge. P.S. I do not know whether this will affect it at boundary conditions but in a furnace set - Buoyancy (for conv. heat).
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 February 8, 2011, 18:20 #2 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 13,737 Rep Power: 106 Can you explain what you are trying to do? I do not understand your explanation.

February 9, 2011, 04:04
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 Originally Posted by ghorrocks Can you explain what you are trying to do? I do not understand your explanation.

OK.
How to create the boundary conditions on the in and out. (see illustration).
The model included treatment-Buoyancy.

 February 9, 2011, 06:32 #4 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 13,737 Rep Power: 106 I would set the In boundary to be a mass flow boundary at 1.035e-2 kg/s and the outlet to be a pressure opening at 0Pa. Use a reference pressure of 1atm-20Pa. You cannot specify both the pressure and flow rate of an inlet boundary. This would over specify the boundary.

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