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. 2017 Jan 3;7:39620. doi: 10.1038/srep39620

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Dimensionless particle size versus dimensionless settling velocity for the experimental (both ETB and LSP, a) and numerical (S4W) cases (b). Different colors denote particles settling within variable intervals of particle volume fraction (ϕ_p, note the larger interval for the lowest ϕ_p values, due to the occurrence of fewer particles in this range). Fitting curves (solid and dashed for the experimental and numerical cases, respectively) for the different ϕ_p intervals follow equation (3). Arrows in (b) mark the deviation between spherical (numerical) and irregular (experimental) particles.