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Mazumdar, Asis
- 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 :405 |
PDF Views:3
Authors
Affiliations
1 Department of Mechanical Engineering, Kalyani Government Engineering College, Kalyani - 741235, West Bengal, IN
2 School of Water Resources Engineering, Jadavpur University, Kolkata - 700032, IN
1 Department of Mechanical Engineering, Kalyani Government Engineering College, Kalyani - 741235, West Bengal, IN
2 School of Water Resources Engineering, Jadavpur University, Kolkata - 700032, IN
Source
Indian Science Cruiser, Vol 31, No 4 (2017), Pagination: 36-49Abstract
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
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- A. Dutta, S. Mukherjee, A. Mazumdar, Influence of viscosity on sediment transport along a river bank, Indian Science Cruiser. Vol 27, No. 4, page-13-17, 2013
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- S. Mukherjee, A. Mazumdar, Study of effect of the variation of inter-particle distance on the erodibility of a riverbank under cohesion with a new model, Journal of Hydro-environment Research. Vol 4, page 235-242, 2010
- S.S. Hsiau, S.C. Yang, Numerical simulation of self-diffusion and mixing in a vibrated granular bed with the cohesive effect of liquid bridges, Chemical Engineering Science. Vol 58, page 339-351, 2003
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- Determination of The Escape Velocity of Particles on A Riverbank Using the Truncated Pyramid Model
Abstract Views :213 |
PDF Views:3
Authors
Affiliations
1 Department of Mechanical Engineering, Kalyani Government Engineering College, Kalyani - 741235, West Bengal, IN
2 School of Water Resources Engineering, Jadavpur University, Kolkata - 700032, IN
1 Department of Mechanical Engineering, Kalyani Government Engineering College, Kalyani - 741235, West Bengal, IN
2 School of Water Resources Engineering, Jadavpur University, Kolkata - 700032, IN
Source
Indian Science Cruiser, Vol 24, No 5 (2010), Pagination: 38-46Abstract
In this paper it has been shown that the cohesive force binds the particles on a riverbank. The escape velocity of the particles is a function of the inter-particle distance, the mean radius of the particles and the volume of water entrapped between them. The escape velocity is the velocity required by a particle to get separated from the riverbank. It helps in determination of other relevant parameters like volumetric rate of bank erosion, entrainment rate and so on. Unlike the previous research here light has been thrown on the cohesive force between the adjacent particles in a deterministic manner. The influence of a gradual increase in the volume of water bridge on the escape velocity of a particle has also been studied.
An analysis of the data has been made to find the level of significance of the input parameters. This includes a regression analysis for calculation of the residual values between the predicted and the calculated escape velocities. Corresponding graphs have also been plotted to present these variations pictorially.
Keywords
Cohesive Force, Inter-Particle Distance, Water Bridge, Truncated Pyramid Model.- Influence of Viscosity on Sediment Transport along a River Bank
Abstract Views :217 |
PDF Views:3
Authors
Affiliations
1 Department of Mechanical Engineering, Kalyani Government Engineering College, Kalyani - 741235, West Bengal, IN
2 School of Water Resources Engineering, Jadavpur University, Kolkata - 700032, IN
1 Department of Mechanical Engineering, Kalyani Government Engineering College, Kalyani - 741235, West Bengal, IN
2 School of Water Resources Engineering, Jadavpur University, Kolkata - 700032, IN
Source
Indian Science Cruiser, Vol 27, No 4 (2013), Pagination: 13-17Abstract
A particle on a riverbank is subjected to a number of forces. Among them, cohesive and viscous forces are predominant, hi this present work, an analytical model called the Truncated Pyramid Model has been used to quantify the effect of the viscous force on the particles on a riverbank and the dynamic influence of water entrapped between the particles. For this, the existing model has been suitably modified to incorporate the viscous effect. The whole mechanism involves a good number of variables namely inter-particle distance, separation speed, liquid bridge volume, radius of the sphere particle and radius of the wetted area. In this work, cohesive and viscous force components have been resolved along horizontal and vertical directions and two separate differential equations have been established for horizontal and vertical components of separation speed that is varying with time. Variation of separation speed with separation distance for a particular liquid bridge volume at different times has been evaluated thereafter.
Keywords
Inter Particle Separation Distance, Separation Speed, Liquid Bridge Volume, Truncated Pyramid Model.- Effect of Cohesive and Seepage Force on A Bank Sediment Particle
Abstract Views :300 |
PDF Views:0
Authors
Affiliations
1 Department of Mechanical Engineering, Kalyani Government Engineering College, Kalyani-741235, West Bengal, IN
2 School of Water Resources Engineering, Jadavpur University, Kolkata, Pin-700032., West Bengal, IN
1 Department of Mechanical Engineering, Kalyani Government Engineering College, Kalyani-741235, West Bengal, IN
2 School of Water Resources Engineering, Jadavpur University, Kolkata, Pin-700032., West Bengal, IN
Source
Indian Science Cruiser, Vol 34, No 1 (2020), Pagination: 21-26Abstract
The phenomenon of erosion of a riverbank is extremely complicated and various forces act on bank sediments. Cohesive force between these grains and the force due to seepage of water play an important role among those forces. The present work uses the ‘‘Truncated Pyramid Model (TPM)’’ for the arrangement of grains and proposes generalized equations for calculating escape velocity under cohesion and seepage. The effect of seepage force along with the cohesive force has been studied for different degrees of exposure (fully exposed, half exposed and fully submerged) and compared with the previous study where only the force of cohesion was taken into account. The change in escape velocity due to seepage force for different degrees of exposure has been determined in this paper for three different grain sizes (300 µm, 400 µm and 500 µm of radius) along with different inter-particle distances.Keywords
Sediments, Riverbank Erosion, Truncated Pyramid Model, Cohesive Force, Seepage Force, Escape Velocity.References
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- J.G. Duan, Analytical approach to calculate rate of bank erosion, Journal of Hydraulic Engineering, Vol 131 (11), page 980-989, 2005
- R. Zhang, J. Li, Simulation on mechanical behavior of cohesive soil by Distinct Element Method, Journal of Terramechanics, Vol 43, page 303-316, 2006
- F. Soulie, M.S.E. Youssoufi, F. Cherblanc, C. Saix, Capillary Cohesion and Mechanical Strength of Polydisperse Granular Materials, The European Physics Journal, E Vol 21, page 349 -357, 2006
- M. Achite, S. Ouillon, Suspended sediment transport in a semiarid watershed, Wadi Abd, Algeria (1973-1995), Journal of Hydrology, Vol 343(3-4), page 187-202, 2007
- S. Mukherjee, A. Mazumdar, Study of effect of the variation of inter-particle distance on the erodibility of a riverbank under cohesion with a new model, Journal of Hydro-environment Research, Vol 4 (3), page 235-242, 2010
- S. Mukherjee, Application of Truncated Pyramid Model in determination of escape velocity of particles of different diameters in varying conditions, International Journal of Soft Computing and Engineering (IJSCE), Vol 1(5), page 75-79, 2011
- A. Armanini, C. Gregoretti, Incipient sediment motion at high slopes in uniform flow condition, Water Resources Research, Vol 41, page W12431-8, 2005
- Comparison of Flow Fields around a Horizontal Cylinder Placed at Different Depths on the Water Channel
Abstract Views :254 |
PDF Views:0
Authors
Affiliations
1 School of Water Resources Engineering, Jadavpur University, Kolkata, IN
1 School of Water Resources Engineering, Jadavpur University, Kolkata, IN
Source
Indian Science Cruiser, Vol 34, No 4 (2020), Pagination: 44-50Abstract
A laboratory experiment was conducted by placing a 50 mm diameter horizontal cylinder across the flow and a 50 mm wide vertical plate at 55 mm downstream of it in a flume to observe and compare the surrounding flow fields past these structures. The cylinder vertical position was altered from 0.3 to 0.4 times of flow depth of water. Around these structures, the obtained flow fields, vortex formation, and turbulent characteristics are analyzed, compared and discussed.Keywords
Submerged Cylinder, Vortex-Induced Vibration, Vortices, Flow Fields.References
- S Dey, R V Raikar, Characteristics of Horseshoe Vortex in Developing Scour Holes at Piers, Journal of Hydraulic Engineering, Vol 133, Issue 4, page 399-413, 2007.
- S Das, R Das, A Mazumdar, Vorticity and Circulation of Horseshoe Vortex in Equilibrium Scour Holes at Different Piers, Journal of the Institution of Engineers (India): Series A, Vol 95, Issue 2, page 109-115, 2014.
- S Das, R Das, A Mazumdar, Comparison of Local Scour Characteristics around Two Eccentric Piers of Different Shapes, Arabian Journal for Science and Engineering, Vol 41, Issue 4, page 1199-1213, 2016.
- B Mukherjee, S Das, A Mazumdar, Mathematical Analysis for the Loss of Future Storage Capacity at Maithon Reservoir, India, ARPN Journal of Engineering and Applied Sciences, Vol 8, No 10, page 841-845, 2013.
- B Mukherjee, S Das, A Mazumdar, Environmental Study and Analysis of Silts Deposition at Maithon Reservoir, Indian Journal of Environmental Protection, Vol 35, No 3, page 177-187, 2015.
- R Ettema, G Kirkil, M Muste, Similitude of LargeScale Turbulence in Experiments on Local Scour at Cylinders, Journal of Hydraulic Engineering, Vol 132, Issue 1, page 33-40, 2006.
- T I Eldho, D L Young, Dual Reciprocity Boundary Element Solutions of Stokes Flows Problems Based on Velocity-Vorticity Formulation, Journal of the Chinese Institute of Engineers, Vol 24, Issue 2, page 141-150, 2001.
- S Das, A Mazumdar, Evaluation of Hydrodynamic Consequences for Horseshoe Vortex System developing around two eccentrically arranged Identical Piers of Diverse Shapes, KSCE Journal of Civil Engineering, Vol 22, No 7, page 2300-2314, 2018.
- H Jaman, S Das, R Das, A Mazumdar, Hydrodynamics of flow obstructed by inline and eccentrically-arranged circular piers on a horizontal bed surface, Journal of The Institution of Engineers (India): Series A, Vol 98, No 1-2, page 77-83, 2017.
- H Jaman, S Das, A Kuila, A Mazumdar, Hydrodynamic flow patterns around three inline eccentrically arranged circular piers, Arabian Journal for Science and Engineering, Vol 42, Issue 9, page 3973-3990, 2017.
- S Das, H Jaman, A Chatterjee, R Das, A Mazumdar, Hydrodynamic behaviour of Flow past three typically arranged circular piers on different horizontal planes, International Journal of Fluid Mechanics Research, Vol 44, Issue 5, page 457-468, 2017.
- S Das, R Midya, R Das, A Mazumdar, A Study of Wake Vortex in the Scour Region around a Circular Pier, International Journal of Fluid Mechanics Research, Vol 40, Issue 1, page 42-59, 2013.
- S Das, A Mazumdar, Turbulence flow field around two eccentric circular piers in scour hole, International Journal of River Basin Management, Vol 13, Issue 3, page 343-361, 2015.
- M M Bernitsas, K Raghavan, Y Ben-Simon, E M H Garcia, VIVACE (Vortex Induced Vibration Aquatic Clean Energy): A New Concept in Generation of Clean and Renewable Energy From Fluid Flow, Journal of Offshore Mechanics and Arctic Engineering, Vol 130, Issue 4, page 041101, 2008.
- B Mukherjee, S Das, A Mazumdar, Electrical Energy Generation by Enhancing Flow Induced Vibration, 2nd International Conference on Control, Instrumentation, Energy & Communication, CIEC 2016, Calcutta, India, page 368-371, 2016.
- B Mukherjee, S Das, A Mazumdar, Sustainable electrical Energy Generation Technique in Shallow Water Channels, 2016 IEEE Students’ Technology Symposium, Kharagpur, India, page 147-151, 2016.
- M M Bernitsas, Y Ben-Simon, K Raghavan, E M H Garcia, The VIVACE Converter: Model Tests at High Damping and Reynolds Number Around 105, Journal of Offshore Mechanics and Arctic Engineering, Vol 131, Issue 1, page 011102, 2009.
- B Mukherjee, S Das, A Mazumdar, Complex Flow Phenomena of Horizontally Placed Underwater Cylinder above Water Bed, Water and Energy International, Vol 60, No 8, page 57-64, 2017.