The discussion by Le Roux (hereafter referred to as "the Discussion") erroneously criticizes two points of Chen and Fryrear (2001) and Chen (2003): (1) the "measurements greatly exceeded the settling velocities given by Stokes' Law," and (2) the Equations 22 and 29 of Chen (2003) do not apply when the Reynolds number is 76,670.9.

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Chen and Fryrear (2001) accurately measured and calculated settling velocities of particles falling in air using Stokes' equation (Stokes 1851) for particles settling in the Stokes range. The key point here is that the Discussion misconstrued the geometric and settling diameters of particles...

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