The Experts below are selected from a list of 5409 Experts worldwide ranked by ideXlab platform
Manish Kumar Jain - One of the best experts on this subject based on the ideXlab platform.
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Hydraulic Transportation of coal combustion products for mine fill
Particulate Science and Technology, 2019Co-Authors: Radha Rani, Manish Kumar JainAbstract:Coal combustion product (CCP) is generated after combustion of coal in thermal power plants. Generation of CCP depends on the combustion efficiency and properties of coal. Developing countries are ...
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effect of bottom ash at different ratios on Hydraulic Transportation of fly ash during mine fill
Powder Technology, 2017Co-Authors: Radha Rani, Manish Kumar JainAbstract:Abstract This study examines the suitability of Durgapur Steel Thermal Power Station fly ash and bottom ash for mine fill material based on their physiochemical and rheological properties. The physiochemical properties of both fly ash and bottom ash are suitable for mine fill. Hydraulic Transportation of fly ash for mine fill is a challenge for engineers due to its poor flow properties at higher solid concentration. Rheological properties of fly ash are shown that beyond 40% solid concentration Hydraulic Transportation may not be effective. Therefore an attempt has been made in this study by adding bottom ash to fly ash at various solid to liquid ratios to improve flow behaviour. Viscosity and rheological properties are studied for this purpose. The results show that the mixture of fly ash and bottom ash at 7:3, 6:4 and 5:5 at 50% solid concentration provides the best result by reducing the shear stress and viscosity. These combinations not only improve the rheological properties in terms of energy consumption, but also decrease the use of water for Hydraulic Transportation. Therefore, the present study shows that the addition of bottom ash can improve rheological properties of fly ash at higher solid concentration.
D. Wang - One of the best experts on this subject based on the ideXlab platform.
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water only performance of proportioning jet pumps for Hydraulic Transportation of solids
Powder Technology, 1995Co-Authors: D. WangAbstract:Abstract Experimental observations of water-only performance and pressure losses have been made for a proportioning jet pump feeder with eighteen different configurations and designs. Based on these results, the influence of structure and configuration on the performance of jet pump feeder has been investigated. Optimal configuration and geometrical parameters have been recommended for design practice. Formulae for performance prediction have been proposed and verified.
Radha Rani - One of the best experts on this subject based on the ideXlab platform.
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Hydraulic Transportation of coal combustion products for mine fill
Particulate Science and Technology, 2019Co-Authors: Radha Rani, Manish Kumar JainAbstract:Coal combustion product (CCP) is generated after combustion of coal in thermal power plants. Generation of CCP depends on the combustion efficiency and properties of coal. Developing countries are ...
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effect of bottom ash at different ratios on Hydraulic Transportation of fly ash during mine fill
Powder Technology, 2017Co-Authors: Radha Rani, Manish Kumar JainAbstract:Abstract This study examines the suitability of Durgapur Steel Thermal Power Station fly ash and bottom ash for mine fill material based on their physiochemical and rheological properties. The physiochemical properties of both fly ash and bottom ash are suitable for mine fill. Hydraulic Transportation of fly ash for mine fill is a challenge for engineers due to its poor flow properties at higher solid concentration. Rheological properties of fly ash are shown that beyond 40% solid concentration Hydraulic Transportation may not be effective. Therefore an attempt has been made in this study by adding bottom ash to fly ash at various solid to liquid ratios to improve flow behaviour. Viscosity and rheological properties are studied for this purpose. The results show that the mixture of fly ash and bottom ash at 7:3, 6:4 and 5:5 at 50% solid concentration provides the best result by reducing the shear stress and viscosity. These combinations not only improve the rheological properties in terms of energy consumption, but also decrease the use of water for Hydraulic Transportation. Therefore, the present study shows that the addition of bottom ash can improve rheological properties of fly ash at higher solid concentration.
B K Gandhi - One of the best experts on this subject based on the ideXlab platform.
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Hydraulic performance and erosive wear of centrifugal slurry pumps a review
Powder Technology, 2017Co-Authors: Rahul Tarodiya, B K GandhiAbstract:Abstract Centrifugal pumps are being extensively used for Hydraulic Transportation of solids over short and medium distances through pipelines where the requirements of head and discharge are moderate. The performance characteristics and erosion wear of the pump components are the most critical design and selection parameters. An improvement in performance reduces the energy expenditure while the reduction in erosion wear enhances the service life. Efforts have been made to estimate the reduction in water performance of the pump for handling different types of solid particles and to find methods to mitigate it. Different correlations were proposed to estimate the pump performance handling slurry. Regarding the erosion of the pump components, different techniques were used to identify the zones of maximum localized wear and to suggest an approach to reduce it. In the present paper, experimental and numerical studies undertaken in this area have been discussed. For the optimized pump design, selection of the pump material, properties of the solid particles, flow characteristic of the slurry and the concentration of the solids play a significant role. The review summarizes the current state of the art of estimation of pump performance and wear characteristics of the pump. The pump design needs to be optimized for handling slurries based on the drop in performance and expected service life.
Yuji Tomita - One of the best experts on this subject based on the ideXlab platform.
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comparative study of pressure drop in multisized particulate slurry flow through pipe and rectangular duct
International Journal of Multiphase Flow, 2003Co-Authors: D R Kaushal, Yuji TomitaAbstract:Abstract Reduction in energy requirement for Hydraulic Transportation of solids has been the main concern of researchers. Investigators have reported considerable reduction of head loss in rectangular ducts than traditional circular pipes. In the present study, concentration profiles for six particle sizes ranging from 38 to 739 μm were measured using a traversing mechanism and isokinetic sampling probe at nine levels in the vertical plane for multisized particulate zinc tailings slurry flowing through rectangular duct having Hydraulic diameter of 80 mm, width of 200 mm and height of 50 mm. The experiments were conducted at different flow velocities ranging from 1 to 4 m/s using five efflux concentrations ranging from 4% to 26% by volume for each velocity. Solids concentration profiles were found to be a function of particle size, velocity of flow and efflux concentration of slurry. Solids concentration varied with the vertical position, except for particle size of 38 μm. Experimental data for pressure drop were also collected at six efflux concentrations ranging from 0% to 26% at flow velocities ranging from 1.0 to 4 m/s for each efflux concentration. Pressure drops and solids concentration profiles data measured in the present study for rectangular duct are compared with previous data for 105 mm diameter pipe.
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concentration at the pipe bottom at deposition velocity for Transportation of commercial slurries through pipeline
Powder Technology, 2002Co-Authors: D R Kaushal, Yuji Tomita, R R DighadeAbstract:In commercial slurries, the solids being transported are multisized and their size may span three orders of magnitude. The minimum operating velocity is usually kept as 0.5 m/s more than the deposition velocity. Deposition velocity is the flow velocity at which the deposition of solids occurs. In the present study, Kaushal [D.R. Kaushal, Prediction of particle distribution in the flow of multisized particulate slurries through closed ducts and open channels, PhD Thesis, Department of Applied Mechanics, I.I.T. Delhi, 1995], Mukhtar [A. Mukhtar, Investigations of the flow of multisized heterogeneous slurries in straight pipe and pipe Bends, PhD Thesis, Department of Applied Mechanics, I.I.T. Delhi, 1991] and Seshadri et al. [V. Seshadri, R.C. Malhotra, S. Anand, Hydraulic Transportation of mineral ores, a state of the art report, Internal Report, Fluid Mechanics Laboratory, I.I.T. Delhi, 1975; V. Seshadri, R.C. Malhotra, Rheological properties of iron ore slimes slurries at high concentrations, Internal Report, Fluid Mechanics Laboratory, I.I.T. Delhi, 1980] data with multisized particulate iron ore slimes, copper tailings and zinc tailings slurries flowing through 105 and 55 mm diameter pipelines have been considered. Based on extensive analysis of experimental data, the Karabelas [AIChE J. 23 (1977) 426] model for prediction of concentration profile has been modified. On the basis of predicted concentration profiles, it is concluded that solid concentration at the pipe bottom reaches approximately 3.0 times the product of efflux concentration and static settled concentration by volume at deposition velocity.
