The Experts below are selected from a list of 522 Experts worldwide ranked by ideXlab platform
Peter W Wypych - One of the best experts on this subject based on the ideXlab platform.
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An experimental investigation into modeling solids friction for fluidized dense-phase pneumatic transport of powders
Particuology, 2017Co-Authors: G Setia, Soumya Suddha Mallick, Renhu Pan, Peter W WypychAbstract:Abstract Results are presented of an ongoing investigation into modeling friction in fluidized dense-phase pneumatic transport of bulk solids. Many popular modeling methods of the solids friction use the dimensionless solids loading ratio and Froude number. When evaluated under proper scale-up conditions of pipe diameter and length, many of these models have resulted in significant inaccuracy. A technique for modeling solids friction has been developed using a new combination of dimensionless numbers, volumetric loading ratio and the ratio of particle free settling Velocity to superficial Conveying Air Velocity, to replace the solids loading ratio and Froude number. The models developed using the new formalism were evaluated for accuracy and stability under significant scale-up conditions for four different products conveyed through four different test rigs (subject to diameter and length scale-up conditions). The new model considerably improves predictions compared with those obtained using the existing model, especially in the dense-phase region. Whereas the latter yields absolute average relative errors varying between 10% and 86%, the former yielded results with errors from 4% to 20% for a wide range of scale-up conditions. This represents a more reliable and narrower range of prediction that is suitable for industrial scale-up requirements.
G Setia - One of the best experts on this subject based on the ideXlab platform.
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An experimental investigation into modeling solids friction for fluidized dense-phase pneumatic transport of powders
Particuology, 2017Co-Authors: G Setia, Soumya Suddha Mallick, Renhu Pan, Peter W WypychAbstract:Abstract Results are presented of an ongoing investigation into modeling friction in fluidized dense-phase pneumatic transport of bulk solids. Many popular modeling methods of the solids friction use the dimensionless solids loading ratio and Froude number. When evaluated under proper scale-up conditions of pipe diameter and length, many of these models have resulted in significant inaccuracy. A technique for modeling solids friction has been developed using a new combination of dimensionless numbers, volumetric loading ratio and the ratio of particle free settling Velocity to superficial Conveying Air Velocity, to replace the solids loading ratio and Froude number. The models developed using the new formalism were evaluated for accuracy and stability under significant scale-up conditions for four different products conveyed through four different test rigs (subject to diameter and length scale-up conditions). The new model considerably improves predictions compared with those obtained using the existing model, especially in the dense-phase region. Whereas the latter yields absolute average relative errors varying between 10% and 86%, the former yielded results with errors from 4% to 20% for a wide range of scale-up conditions. This represents a more reliable and narrower range of prediction that is suitable for industrial scale-up requirements.
Vijay K. Agarwal - One of the best experts on this subject based on the ideXlab platform.
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influence of particle attrition on erosive wear of bends in dilute phase pneumatic Conveying
Wear, 2020Co-Authors: Yassin Alkassar, Vijay K. Agarwal, R K Pandey, Niranjana BeheraAbstract:Abstract Bulk materials like sand particle/alumina, which do not possess good Air retention properties or high permeability are generally conveyed in the dilute phase, suspension flow in conventional pneumatic Conveying systems. High inlet Conveying Air Velocity is thus necessary to successfully convey such materials. As a result of high Air Velocity, the particles impact on the bend surface and cause erosion of bends and attrition of particles. The study of bend erosion has been a subject of research for a long time and the influence of various operating parameters has been widely investigated. The authors have carried out an extensive experimental plan to study the influence of recirculation of material on the erosion of bends and attrition of particles. It is expected that the severity of erosion may go down as the particles lose sharp edges due to the recirculation of material. Silica sand having a mean particle size of 435 micron was conveyed in the pneumatic Conveying pilot plant. The pipeline test loop is 48 m long and 67 mm bore. The bends were placed in horizontal-horizontal orientation with R/d ratio of 4.0. The solid particle erosion behavior of three test bends (B1, B2 and B3) and particle attrition have been analyzed. A 300 kg batch of sand was recirculated 29 times through the test pipeline, thus Conveying a total of 8.7 tonnes. The mass loss and bend wall thickness were regularly monitored. Material sample during each run was collected to assess the extent of particle attrition and changes in the particle morphology. This paper presents the experimental results of a comprehensive analysis of the erosion and particle degradation with a change in particle morphology. A correlation has been developed between the extent of material recirculated through the test pipeline and its influence on the erosion of bends and degradation of particles.
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Effect of Bend Geometry on Erosion and Product Degradation in Pneumatic Conveying Pipeline Systems
2015Co-Authors: Amit Suhane, Vijay K. AgarwalAbstract:Conveying hard and the abrasive materials has been one of the major operational problems in industrial situations. The erosion of plant components, especially the pipe bends by abrasive solid particles of a fluid stream makes installation of pneumatic Conveying systems a very costly affAir for industry. Most users have either lived with the problem or have employed expensive bend materials to reduce the bend erosion rate and prolong the life of bends. A number of operating variables such as the impact Velocity and impact angle affect the erosion and product degradation process significantly in a dilute phase suspension flow. It is therefore important that the systems should be designed with the lowest possible Velocity of Conveying. Modification in the pipeline- bend geometry by means of tapered (converging and diverging) sections can also be used for maintaining Conveying Air Velocity constant along the entire length of pipeline.The current work presents erosion of G.I. bends examined in a pneumatic conveyor under two different arrangements of mild steel pipe and G.I. bends of 51mm and 102mm bore in a test loop of 40 m length. Silica sand particles having mean particle size of 212 μm were used as erodent for impingement on the bend surface. This paper discuss the results of comprehensive test program to study the effect of bend geometry on erosion and product degradation in pneumatic Conveying pipeline systems
Renhu Pan - One of the best experts on this subject based on the ideXlab platform.
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An experimental investigation into modeling solids friction for fluidized dense-phase pneumatic transport of powders
Particuology, 2017Co-Authors: G Setia, Soumya Suddha Mallick, Renhu Pan, Peter W WypychAbstract:Abstract Results are presented of an ongoing investigation into modeling friction in fluidized dense-phase pneumatic transport of bulk solids. Many popular modeling methods of the solids friction use the dimensionless solids loading ratio and Froude number. When evaluated under proper scale-up conditions of pipe diameter and length, many of these models have resulted in significant inaccuracy. A technique for modeling solids friction has been developed using a new combination of dimensionless numbers, volumetric loading ratio and the ratio of particle free settling Velocity to superficial Conveying Air Velocity, to replace the solids loading ratio and Froude number. The models developed using the new formalism were evaluated for accuracy and stability under significant scale-up conditions for four different products conveyed through four different test rigs (subject to diameter and length scale-up conditions). The new model considerably improves predictions compared with those obtained using the existing model, especially in the dense-phase region. Whereas the latter yields absolute average relative errors varying between 10% and 86%, the former yielded results with errors from 4% to 20% for a wide range of scale-up conditions. This represents a more reliable and narrower range of prediction that is suitable for industrial scale-up requirements.
Soumya Suddha Mallick - One of the best experts on this subject based on the ideXlab platform.
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An experimental investigation into modeling solids friction for fluidized dense-phase pneumatic transport of powders
Particuology, 2017Co-Authors: G Setia, Soumya Suddha Mallick, Renhu Pan, Peter W WypychAbstract:Abstract Results are presented of an ongoing investigation into modeling friction in fluidized dense-phase pneumatic transport of bulk solids. Many popular modeling methods of the solids friction use the dimensionless solids loading ratio and Froude number. When evaluated under proper scale-up conditions of pipe diameter and length, many of these models have resulted in significant inaccuracy. A technique for modeling solids friction has been developed using a new combination of dimensionless numbers, volumetric loading ratio and the ratio of particle free settling Velocity to superficial Conveying Air Velocity, to replace the solids loading ratio and Froude number. The models developed using the new formalism were evaluated for accuracy and stability under significant scale-up conditions for four different products conveyed through four different test rigs (subject to diameter and length scale-up conditions). The new model considerably improves predictions compared with those obtained using the existing model, especially in the dense-phase region. Whereas the latter yields absolute average relative errors varying between 10% and 86%, the former yielded results with errors from 4% to 20% for a wide range of scale-up conditions. This represents a more reliable and narrower range of prediction that is suitable for industrial scale-up requirements.