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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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On the residence time distribution in idealized groundwatersheds
Journal of Hydrology, 1995The relative cumulative frequency distribution of residence times F(T) is calculated for an entire groundwatershed under steady-state conditions and assuming Dupuit-Forchheimer flow. It appears that F(T) is always the same: F(T) = 1 -exp(−TT), provided that the aquifer recharge rate and T are constant over the groundwatershed.
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INTERNAL AND EXTERNAL RESIDENCE-TIME DISTRIBUTIONS
Chemical Engineering Communications, 1983(1983). INTERNAL AND EXTERNAL RESIDENCE-TIME DISTRIBUTIONS. Chemical Engineering Communications: Vol. 22, No. 1-2, pp. 105-107.
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