Results 301 to 310 of about 860,879 (347)

RESIDENCE TIME DISTRIBUTIONS AND MICROMIXING

Chemical Engineering Communications, 1981
Abstract 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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Residence Time Distributions in Ozone Contactors

Ozone: Science & Engineering, 2008
The 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, W.S.J. Uijttewaal, L.C. Rietveld, G.S. Stelling, J.C. van Dijk, J.A.M.H. Hofman   +5 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, 1968
Abstract 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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Modelling of the residence time distribution in micromixers

Chemical Engineering Journal, 2008
Abstract A technique for the measurement of the residence time distribution (RTD) in microfluidic devices is presented. The measurements were performed by an input–response technique monitoring a dye tracer concentration spectroscopically at the inlet and outlet of a microfluidic device.
D. Bošković, S. Loebbecke
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Tracer curves and the residence time distribution

Chemical Engineering Science, 1970
Abstract 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, B.W. Lai, C.Y. Chatlynne   +2 more
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Use of gamma distributed residence times in pharmacokinetics

European Journal of Clinical Pharmacology, 1983
Using 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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RESIDENCE TIME DISTRIBUTIONS IN A JETLOOP REACTOR

Chemical Engineering Communications, 1995
Abstract The effect of residence time, jet position, jet size, catalyst mass and temperature on the recycle ratio in a jetloop reactor using a residence time distribution model is reported. The recycle ratio goes through a maximum as residence time changes. The recycle ratio increases as jet size, catalyst mass and temperature are reduced.
K. P. MOLLER, J. C. Q. FLETCHER, C. T. O'CONNOR, R. J. BECKER   +3 more
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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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On the residence time distribution in idealized groundwatersheds

Journal of Hydrology, 1995
The 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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Residence time distribution in continuous crystallisers

Journal of Applied Chemistry, 1970
AbstractThe theory of continuous crystallisation (especially of sucrose) in crystallisers connected in series, in which a suspension of growing crystals is fed forward through the system without backmixing, is presented, and the calculation of the minimum coefficient of variation that can be attained under stated conditions is described.
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