Results 211 to 220 of about 204,706 (259)
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Measurement of residence times and residence-time distributions
1986It is not the intention of this chapter to treat exhaustively the theory of residence-time measurements; there are many excellent textbooks on the subject1,2. A brief review of ideal and non-ideal models, together with an indication of how the more important parameters of the models may be calculated, is sufficient for our purposes.
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RESIDENCE TIME DISTRIBUTIONS AND MICROMIXING
Chemical Engineering Communications, 1981Abstract This review is concerned primarily with the Lagrangian approach to mixing. First, the concepts of residence time and residence time distribution are introduced and defined. After a general treatment of this topic in the second chapter, the concept of micromixing is discussed in the third chapter with due emphasis on the application to chemical
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Perspectives in residence-time distributions
Chemical Engineering Science, 1983Abstract A short history is given of the development of interest in residence-time distributions. Attention is concentrated on the role played in this development by Danckwerts' 1953 paper [6]. This defined the residence-time functions in the form now customarily used, and much subsequent development remains based on the approaches laid out in [6 ...
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Residence time distribution in submerged biofilters
Water Research, 1980Abstract A mathematical model is presented for the residence time distribution in a submerged denitrification filter, in which pronounced tailing is experienced due to hold-up in the biofilm. Experiments with a dye tracer, Eosine-Y, and with Tritium show that adsorption of the dye makes it impossible to determine biofilm characteristics.
M. Riemer +2 more
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Determination of residence times and residence time distributions by the integrated pulse method
The International Journal of Applied Radiation and Isotopes, 1968Abstract It is well-known that residence times and residence time distributions of complicated industrial systems can be determined with the aid of radioactive tracers. Most of the methods in use require accurrate determination of the amount of activity which is injected into the system and good calibration of the detecting equipment.
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Remarks on random residence time distributions
The Canadian Journal of Chemical Engineering, 1987AbstractA discrete stochastic mixing model for chemical reactor; is presented here. The turbulent flow system has been modeled as a network of ideally mixed compartments with interconnecting flows that are random variables.The model is particularly useful for studying the statistics of RTD and of the output concentration in a chemical reactor.
Octavian Iordache, Sergiu Corbu
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Use of gamma distributed residence times in pharmacokinetics
European Journal of Clinical Pharmacology, 1983Using a nonclassical statistically based pharmacokinetic concept, a theory is presented which can be applied to the analysis of concentration-time data fitted by power functions of time C = At-ae-bt, which is shown to be equivalent to the assumption of gamma distributed residence times of drugs. The shape and scale parameters a and b, respectively, are
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Tracer curves and the residence time distribution
Chemical Engineering Science, 1970Abstract For a pulse input the shape of the output tracer curve depends on the way tracer is distributed across the flowing fluid, and the way it is measured. This paper properly relates the different curves which may be obtained for flows with negligible cross diffusion, and shows which one of these represents directly the residence time ...
Octave Levenspiel +2 more
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Residence Time Distributions in Ozone Contactors
Ozone: Science & Engineering, 2008The hydraulics in ozone systems, characterized by the residence time distribution, are investigated numerically as well as experimentally. The complex geometry of the ozone contactors requires the application of computational fluid dynamics (CFD), which in combination with experimental results gives insight in the hydraulic processes. Particle tracking
B.A. Wols +5 more
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Residence time distribution in a holding tube
Journal of Food Engineering, 1992Abstract The residence time distribution (RTD) of two Newtonian (water and 12% sucrose solution) and two non-Newtonian liquids (0·2 and 0·4% guar gum solutions), at a minimum of five different flow rates each, was determined in a holding tube consisting of 10 sections with a total length of 33 m, at 25±0·5°C.
Martin F. Sancho, M.A. Rao
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