I am calculating the air mass flow rate in kg/s for air in a numerical model, and i want to compare the results with an experimental investigation, the flowmeter unit is l/min. how can I convert l/min to kg/s for air?
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3$\begingroup$ You will need the density which means the temperature. Minutes to seconds is a factor of 60. $\endgroup$– Solar MikeMay 23 at 10:10
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2 Answers
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Given the density of air at 15 Deg C is 1.225kg/m^3, then
assuming 10 litres/min is 0.1666667 litres per second as there are 60 seconds in 1 minute.
1000 litres is 1.225 kg/m^3 so 1.225/1000*0.1666667 = 0.00025 kg/s.
But do use the density of your flow based on its temperature.
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1$\begingroup$ +1, but worth reiterating what you mentioned in your comment to the question: the correct density must be determined. $\endgroup$– Wasabi ♦May 23 at 15:03
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Density is a function of both temperature and pressure. You can use the ideal gas law to calculate the density of air:
$\rho=\frac{P}{RT}$
where $T$ is temperature, $P$ is pressure, and $R=287 \frac{J}{kg\cdot K}$ is the specific gas constant for air. Make sure you use the right units; you'll need temperature in Kelvin and pressure in Pascals.
