|Nov23-10, 03:38 AM||#1|
conversion question: normal litres per min to velocity
1. The problem statement, all variables and given/known data
So, Im going to be doing a simulation of a combustor, with premixed air + fuel, and for input I'll need to put in the velocity. I've been given the flow rate in units of Normal litres/min (air = 2000Nl/min, fuel = 25Nl/min), as well as the normal density (normal density air = 1.293kg/Nm³ and fuel = 0.7 kg/Nm³).
The case Im simulating should be at approx 600K and 2 bar.
2. Relevant equations
mass flow = density*velocity*area, density = mass/volume
3. The attempt at a solution
The main problem Im having here isnt so much the actual conversion, as what to do with the units. From the definition of normal litre: "A unit of mass for gases equal to the mass of 1 litre (0.035 3147 ft3) at a pressure of 1 atmosphere and at a standard temperature, 0 C (273.15K)."
Do I need to calculate what the volume & mass flows will be at the simulation temperature & pressure, and then calculate the velocity?
Or can I just use the values of the normal density and normal volume flow to calculate the inlet velocity, then use this as the input for the simulation?
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