Calculate mass flow rate from inlet area
Calculate mass flow rate from inlet area
(OP)

Hi all. I expect this problem is simpler than I think but i'm going around in circles and would appreciate a handy push in the right direction.
I have a combustion situation as shown in the image, note that the blue line represents a grate on which the wood sits, the red lines are an inlet pipe for air
Tw (Temp of wood) is known
Tair (Temp of air) is known
h (vertical displacement between air inlet and fire) is also known
A is the area of opening in the pipe under the fire. (known)
a is the area of opening between the pipe and the outside world and is the variable in my calculation.
From this, does anybody know the link between 'a' and the mass flow rate of air through the pipe and into the fire?
Thanks for any help in advance.





RE: Calculate mass flow rate from inlet area
RE: Calculate mass flow rate from inlet area
RE: Calculate mass flow rate from inlet area
RE: Calculate mass flow rate from inlet area
RE: Calculate mass flow rate from inlet area
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RE: Calculate mass flow rate from inlet area
Renderu, aside from the i let and outlet, the wood is inside a sealed container, hence no air will enter from above. I should also mention that its not the air required by the wood that is key, it is an experiment to see the effect on combustion when adjusting how much air is allowed to the fire.
Mintjulep, I could also mention that the firebox has a constant cross section that is known, what other information would you require?
RE: Calculate mass flow rate from inlet area
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RE: Calculate mass flow rate from inlet area
If you are willing to make enough assumptions and guesses about a dozen or so parameters then I think someone smarter than me could develop some equations that would allow the calculation of an estimate.
RE: Calculate mass flow rate from inlet area
RE: Calculate mass flow rate from inlet area