Author(s): G. Rehbinder

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Abstract: Non cohesive sediment at the bottom of a water reservoir can easily be removed with a siphon. Theoretical analysis and experiments show that the mechanism that initiates the removal the grains of the sediment is due not only to the horizontal viscous shear at the top of the sediment, but also to the flow in the sediment it self. The lift, acting at the grains, is proportional to the square of the flux and at least to the square of the submersion of the mouthpiece of the siphon. Since the flux is limited, the submersion is the most important parameter. The theory says that right below the mouthpiece, the sediment is not exposed to any lift, but to compression. Simple experiments confirm the theoretical conclusions.

DOI: https://doi.org/10.1080/00221689409498694

Year: 1994