### 7.4.2. Mean Diameter

For a `Dispersed Solid` or `Dispersed Fluid`, you must supply the mean diameter of the dispersed particles, droplets or bubbles constituting the phase. The mean diameter is the actual diameter for spherical particles. For non-spherical particles, you should provide the Sauter mean diameter, that is, the diameter of a sphere possessing the same volume as the particles.

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