Tracer experiments in fixed beds: effects of flow maldistribution on the estimation of transport kinetic parameters |
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| Affiliation: | 1. Chemical and Biochemical Engineering Department, Missouri University of Science and Technology, Rolla, MO 65409, USA;2. Universidad Popular Autónoma del Estado de Puebla (UPAEP), Escuela de Ingeniería Química, Puebla, PUE 72410 Mexico;3. Mining and Nuclear Engineering Department, Missouri University of Science and Technology, Rolla, MO 65409, USA;1. Key Laboratory of Thermo-Fluid Science and Engineering, Ministry of Education, Xi’an Jiaotong University, Xi’an, Shaanxi 710049, China;2. Division of Heat Transfer, Department of Energy Sciences, Lund University, P.O. Box 118, SE-22100 Lund, Sweden;1. Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, Dalian University of Technology, 116024 Dalian, China;2. Key Laboratory of Medium-Low Temperature Thermal Energy Efficient Utilization of Ministry of Education, Department of Thermal Energy Engineering, School of Mechanical Engineering, Tianjin University, China;3. The 760th Research Institute of China Shipbuilding Industry Corporation, 116013 Dalian, China;1. Department of Chemical Engineering, Laval University, Québec, QC G1V 0A6, Canada;2. Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstraβe 400, 01328 Dresden, Germany;1. Santa Catarina State University, Food Engineering Department, BR 282, Km 573, 89870-000 Pinhalzinho, Santa Catarina, Brazil;2. Federal University of Santa Catarina, Chemical Engineering Department, Laboratory of Numerical Simulation of Chemical Systems, Campus Universitário, 88040-900 Florianópolis, SC, Brazil;3. Federal University of Fronteira Sul, Environmental Engineering, Erechim, Rio Grande do Sul, Brazil;4. Federal University of Rio de Janeiro, COPPE/UFRJ – Chemical Engineering Program, Cidade Universitária, 21941-972 Rio de Janeiro, RJ, Brazil;5. Oregon State University, School of Chemical, Biological, and Environmental Engineering, Corvallis, OR 973312, USA |
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| Abstract: | A systematic study of liquid phase axial dispersion was conducted in glass columns (inner diameters, 1 cm and 1.6 cm), packed randomly with granular sand, by varying the fluid flow rate, particle size and bed height. Pulse and step response techniques, with KCl as an inert tracer, were used. The resultant data, covering the Reynolds number range from 1 to 50, are presented as plots of the Peclet number based on particle diameter against Reynolds number.Inert tracer experiments were also carried out in a column (inner diameter, 1.6 cm) packed with activated carbon granules, using different particle sizes, fluid flow rates and bed heights, in order to estimate the effective intraparticle diffusivity. We show that flow maldistribution produces pulse response curves with sharp, narrow peaks which, when compared with theoretical curves, result in small intraparticle diffusivities.We illustrate how the outer-phase transfer function can be obtained from the overall transfer function of the activated carbon bed and we compare it with the transfer function obtained directly using impermeable particles similar to the activated carbon granules. |
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