Vacuum in the furnace

Clif · February 8, 2011, 11:10

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).

ghorrocks · February 8, 2011, 17:20

Can you explain what you are trying to do? I do not understand your explanation.

Clif · February 9, 2011, 03:04

Quote:

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.

ghorrocks · February 9, 2011, 05:32

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.

February 8, 2011, 11:10	Vacuum in the furnace	#1
Clif New Member Join Date: Aug 2009 Posts: 10 Rep Power: 16	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, 17:20		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,700 Rep Power: 143	Can you explain what you are trying to do? I do not understand your explanation.

February 9, 2011, 05:32		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,700 Rep Power: 143	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.