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Is the gas velocity inlet boundary at standard conditions or the actual value?

2017-12-25View Original

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Simulating natural gas combustion: the natural gas flow rate is 200 Nm3/h, the pressure is 100 KPa, and the temperature is 30°C; the pipe diameter being known, the corresponding air flow rate can be calculated. The question now is: what should be the boundary flow velocity at the natural gas inlet? Should it be calculated based on 200 Nm3/h, or should the actual velocity be determined using the equilibrium equation?

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