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Heat and mass transfer study in fluidized bed granulation-Prediction of entry length 被引量:2
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作者 Papiya Roy Manish Vashishtha +1 位作者 Rajesh Khanna Duvvuri Subbarao 《Particuology》 SCIE EI CAS CSCD 2009年第3期215-219,共5页
Fluidized bed granulation is a process by which granules or coated particles are produced in a single piece of equipment by spraying a hinder as solution, suspension, or melt on the fluidized powder bed. Heat and mass... Fluidized bed granulation is a process by which granules or coated particles are produced in a single piece of equipment by spraying a hinder as solution, suspension, or melt on the fluidized powder bed. Heat and mass transfer correlation useful for designing a granulator has been derived based on the equivalence of evaporation rate of the liquid to the heat transferred from hot gas to particles: (m/A)Dp^2λ/Lmf(1-εmf)(Tg-Tl)Kg=hDp/Kg.This equation is applied to data on granulation experiments by different workers to calculate Reynolds number and Nusselt number to obtain a relation between heat and mass transfer from gas to particles during granulation on a logarithmic scale from which the following empirical relation is obtained: Nu=0.0205Re^1.3876 which is comparable to Kothari's correlation Nu=0.03Re^1.3.By using the heat and mass transfer correlation obtained, the entry length, that is the length of granulator up to which effective heat transfer from gas to bed particles takes place, is estimated, which is also validated with experimental study. The correct estimation of entry length is useful in optimal design of a granulator. 展开更多
关键词 granulation Fluidized bed Gas to particle heat transfer Entry length
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Variation of granule mass fraction with coordination number in wet granulation process
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作者 Papiya Roy Manish Vashishtha +1 位作者 Rajesh Khanna Duvvuri Subbarao 《Particuology》 SCIE EI CAS CSCD 2009年第5期408-413,共6页
In granulation, fine particles combine to form a coarse granule in the form of a particle matrix partially or fully saturated with a binder liquid. The final product of granulation possesses a wide variety of granule ... In granulation, fine particles combine to form a coarse granule in the form of a particle matrix partially or fully saturated with a binder liquid. The final product of granulation possesses a wide variety of granule size distributions with surface mean diameters which differ with operating conditions. The final granule size depends on the operating conditions, e.g. operating gas velocity, inlet air temperature, initial feed particle size, and viscosity of the binder. The objective of this paper is to find out the uniformity in the relation between the granule mass fraction in the final granule size distribution and the number of feed particles present in the granules. The total number of granules obtained depends on the experimental conditions but the granule mass fraction and the number of feed particles forming a single granule are independent of operating variables, feed material and method of granulation. The paper purports further to compare the uniform nature of mass fraction of the granules in final granule size distribution and the primary particles required to form that particular granule size irrespective of experimental conditions of granulation. 展开更多
关键词 Granules Primary particle Coordination number
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Determination of particle exchange rates at over-flow weirs in horizontal fluidised beds by particle tracking velocimetry 被引量:1
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作者 Katja Meyer Andreas Buck Evangelos Tsotsas 《Particuology》 SCIE EI CAS CSCD 2017年第3期1-9,共9页
Residence time distributions (RTDs) in horizontal fluidised beds have a huge effect on solid product properties and are infuenced by the internal design of the apparatus, e.g. the separation into different compartme... Residence time distributions (RTDs) in horizontal fluidised beds have a huge effect on solid product properties and are infuenced by the internal design of the apparatus, e.g. the separation into different compartments by weirs. Weirs can be passed in or against the overall solid transport direction, with the back-flow resulting in axial dispersion, which is a measure of the spread of the RTD. Therefore, the ratio of exchange rates at weirs under different fluidisation conditions provides information on axial dispersion. In this work, a methodology based on particle tracking velocimetry is presented to obtain information on the exchange rates of particles at weirs in horizontal fluidised beds. The internal recirculation is studied for over-flow weirs with respect to different fluidisation conditions, providing a first step towards determining the effects of weirs and fluidisation conditions on axial dispersion and RTDs in horizontal fluidised beds. 展开更多
关键词 Particle tracking velocimetry Horizontal fluidised bedAxial dispersion granulation Drying
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