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Effect of the Variation of Inter-Particle Separation Distance and Separation Time on Escape Velocity of Sediment Particles of a River Bank under the Action of Cohesive and Viscous Forces


Affiliations
1 Department of Mechanical Engineering, Kalyani Government Engineering College, Kalyani - 741235, West Bengal, India
2 School of Water Resources Engineering, Jadavpur University, Kolkata - 700032, India
     

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Mechanism of erosion along a riverbank is full of complexity in nature. Among many forces on the sediment particles along a riverbank, cohesive and viscous forces are predominant. A family of similar particles surrounds every particle and they are bound together under the action of cohesive and viscous forces. In this paper, sediment particles are arranged according to the truncated pyramid model and a general equation for the escape velocity of a particle has been suggested. It is observed that this escape velocity is very much dependent on the inter-particle separation distance for a given liquid bridge volume between a pair of adjacent particles. Determination of the escape velocity is an approach to quantification of volumetric erosion rate. In this paper, a comparison has been made between the values of the escape velocity obtained from a previous study considering only cohesive force and the values of the escape velocity obtained considering both cohesive and viscous forces for a particular liquid bridge volume. All the other parameters remain the same for both the cases. It has been shown that the values of the escape velocity obtained in the present study considering both cohesive and viscous forces increase a considerable amount than the values obtained in the previous study considering cohesive force only for the same input parameters.

Keywords

Riverbank Erosion, Sediment Particle, Cohesive Force, Viscous Force, Separation Distance, Separation Time, Escape Velocity.
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  • Effect of the Variation of Inter-Particle Separation Distance and Separation Time on Escape Velocity of Sediment Particles of a River Bank under the Action of Cohesive and Viscous Forces

Abstract Views: 491  |  PDF Views: 3

Authors

Arijit Dutta
Department of Mechanical Engineering, Kalyani Government Engineering College, Kalyani - 741235, West Bengal, India
Sanchayan Mukherjee
Department of Mechanical Engineering, Kalyani Government Engineering College, Kalyani - 741235, West Bengal, India
Asis Mazumdar
School of Water Resources Engineering, Jadavpur University, Kolkata - 700032, India

Abstract


Mechanism of erosion along a riverbank is full of complexity in nature. Among many forces on the sediment particles along a riverbank, cohesive and viscous forces are predominant. A family of similar particles surrounds every particle and they are bound together under the action of cohesive and viscous forces. In this paper, sediment particles are arranged according to the truncated pyramid model and a general equation for the escape velocity of a particle has been suggested. It is observed that this escape velocity is very much dependent on the inter-particle separation distance for a given liquid bridge volume between a pair of adjacent particles. Determination of the escape velocity is an approach to quantification of volumetric erosion rate. In this paper, a comparison has been made between the values of the escape velocity obtained from a previous study considering only cohesive force and the values of the escape velocity obtained considering both cohesive and viscous forces for a particular liquid bridge volume. All the other parameters remain the same for both the cases. It has been shown that the values of the escape velocity obtained in the present study considering both cohesive and viscous forces increase a considerable amount than the values obtained in the previous study considering cohesive force only for the same input parameters.

Keywords


Riverbank Erosion, Sediment Particle, Cohesive Force, Viscous Force, Separation Distance, Separation Time, Escape Velocity.

References





DOI: https://doi.org/10.24906/isc%2F2017%2Fv31%2Fi4%2F158609