I use CFD to simulate gas dispersion. In this, through results I get the density contour of NOx. How do I convert the density values to concentration? Is ideal gas law suitable, if so give me the conversion steps?
Hi Prof. Ahmad,
I am using CFD Fluent module to predict NOx concentration in a specific CBL (Convective Boundary Layer) condition with a known background concentration. Through simulations in module, I dont get the concentration of the pollutant in-spite I get the density contour in the CBL of my interest. How do I convert the density value of the pollutant to concentration. For example, My background NOx concentration is 6 PPM, how do I convert this concentration into density? Is ideal gas law suitable. If I do using ideal gas law, with know density I would arrive a value in molar mass and from molar mass how do I convert to concentration, since concentration and density is different.
d = m / V, n = m / Mw, C=n/V, PV=nRT where dis density, m is mass, V is total volume, Mw molecular weight, C is concentration and the other terms are known, so you can get C from d according the unit you use. Also, for perfect gas C=P/RT=XP/RT where X is the mole fraction.
Prof. Saad El-Sayed
Thanks for the suggestions. Will work out with your idea and will get back to you for further doubts if any.
Kindly share me you email ID for further clarification of doubts in detail.
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