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What is the most appropriate Method for calculating DPM Concentrations

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Old   August 16, 2012, 12:47
Default What is the most appropriate Method for calculating DPM Concentrations
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Steve Gronstal
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I'm using Fluent to investigate the aspiration efficiency of a devices as a function of Particle Diameter.

To do this, I created a bunch of DPM injections (one for each size fraction), and I release them from my inflow surface.

To determine my "base concentration", I count the particle tracks at the inlet and divide by the Volume of flow at the inlet.

To determine the "sampled concentration", I count the particle tracks traversing my Inlet cross section, and divide that by the volume flow rate through the Inlet.

To determine my aspiration efficiency, I divide the two numbers.

I fear that this method might be biased by however, as the injection surfaces does not have a uniform mesh. Is it better to create a new bounded surface to create a more uniform release? Is my method for determining concentration estimates appropriate, or do I need to run a coupled model for each injection?

At this moment, my model uses inert water droplets in Air that trap on all solid surfaces.

Any advice and/or guidance is appreciated.
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