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Transferring from forum post: https://openqbmm.freeforums.net/thread/48/get-sauter-radius-qbmm
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The Sauter mean diameter is d32 = m3/m2, so the ratio between moment.3.populationBalance and moment.2.populationBalance. The function object here https://github.com/OpenQBMM/OpenQBMM/blob/master/validation/pbeTransportFoam/serraTaylorCouette/75rpm/system/controlDict.populationBalance shows how to find the volume-averaged d43, and can be adapted to your case (note that you will need to make sure no division by zero happens, so add some logic). |
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The Sauter mean diameter is d32 = m3/m2, so the ratio between moment.3.populationBalance and moment.2.populationBalance.
So rSauter = d32/2.
The function object here https://github.com/OpenQBMM/OpenQBMM/blob/master/validation/pbeTransportFoam/serraTaylorCouette/75rpm/system/controlDict.populationBalance shows how to find the volume-averaged d43, and can be adapted to your case (note that you will need to make sure no division by zero happens, so add some logic).