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Table 1.

Parameters of four data sets collected at different gas pressure (mbar), listed in the second column.

Data set P ReC Rep n ϕ ϵ Tf td dp,St−Ep (μm) dp (μm) Ntraj
kn1_2mb [DS1] 2.71 15 0.0006 1 ±1 2.5e-08 0.06 0.107 0.001 Ep40.0 ± 1.8 40.5 ± 1.8 0.06 5758
kn1_3mb [DS2] 3.63 20 0.0008 15±5 7.1e-07 1.32 0.113 0.018 Ep56.4 ± 0.2 48.3 ± 0.2 0.005 65470
kng1_5mb[DS4] 5.45 31 0.003 7±8 3.8e-07 0.47 0.097 0.014 St62.7 ± 3.0 49.8 ± 3.0 0.09 99816
kng1_8mb[DS3] 8.00 45 0.005 21±3 1.4e-06 1.18 0.099 0.065 St63.4 ± 1.1 54.5 ± 1.2 0.03 172615

Notes. The Reynolds numbers for both the container and particle diameters correspond to laminar gas conditions. The values of the volumetric filling factor, ϕ, andspatially averaged solid-gas ratio, ϵ, depend directly on the mean particle number, n, and/or the value of Vmeas, given in the text. The momentum diffusion time, td, is less than the friction time, Tf, in all cases, and both are in units of s. The particle diameter dp, St−Ep is obtained using Eq. (3), where the prescript Ep or St indicates whether the particles belong to either the Epstein or Stokes drag regime. The particle diameter dp derives from Eq. (5), and is the value assumed for the calculation of Re, ϕ, ϵ, Tf, and td. The variance on the mean settling velocity for all experiments in a data set is and is used to estimate the range in mean particle size dp. The last column reports the number of trajectories in a given data set, which is the total sample size for the mean quantities displayed in the data analysis.

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