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We present reproducible experimental measurements for the onset of grain motion in laminar flow and find a constant critical Shields number for particle erosion, i.e., θc=0.12±0.03, over a large range of small particle Reynolds number: 1.5×10−5⩽Rep⩽0.76. Comparison with previous studies found in the literature is provided.
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Ouriemi et al. (2007) studied this question.
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