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Effects of secondary current and stratification on suspension concentration in an open channel flow

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Abstract

In this work, a mathematical model on concentration distribution is developed for a steady, uniform open channel turbulent flow laden with sediments by incorporating the effect of secondary current through velocity distribution together with the stratification effect due to presence of sediments. The effect of particle-particle interaction at reference level and the effect of incipient motion probability, non-ceasing probability and pick-up probability of the sediment particles at reference concentration are taken into account. The proposed model is compared with the Rouse equation as well as verified with existing experimental data. Good agreement between computed value and experimental data indicates that secondary current influences the suspension of particles significantly. The direction and magnitude (strength) of secondary current lead to different patterns of concentration distribution and theoretical analysis shows that type II profile (where maximum concentration appears at significant height above channel bed surface) always corresponds to upward direction and greater magnitude of secondary current.

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  1. Department of Mathematics, Indian Institute of Technology, Kharagpur, Kharagpur, 721302, India

    Snehasis Kundu & Koeli Ghoshal

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  1. Snehasis Kundu
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  2. Koeli Ghoshal
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Correspondence to Koeli Ghoshal.

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Kundu, S., Ghoshal, K. Effects of secondary current and stratification on suspension concentration in an open channel flow. Environ Fluid Mech 14, 1357–1380 (2014). https://doi.org/10.1007/s10652-014-9341-8

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