Results 291 to 300 of about 215,638 (342)
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Residence time distributions in mills
Cement and Concrete Research, 1971Abstract The determination of mean residence time is a powerful method for studying the hold-up in a cement mill, and hence whether the mill is operating in the required steel to clinker ratio. To determine the mean residence time accurately it is necessary to correct for the recycle of tracer, and a method of correction is given.
L.G. Austin, P.T. Luckie, B.G. Ateya
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Residence Time Distribution Model for Soil Filters
Water Environment Research, 2004Pulse tracer tests were carried out to determine the residence time distribution (RTD) in earthworm‐cultured and uncultured, laboratory‐scale soil filters. A two‐parallel‐cell dispersion model for the mixing behavior in soil filters is presented; the model showed excellent fit to experimental data.
PATTANAIK, BR, GUPTA, A, SHANKAR, HS
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Understanding Residence Time, Residence Time Distribution, and Impact of Surge Vessels
2020Axial dispersion and residence time distribution (RTD) have significant process implications in the design of continuous processes. Low dispersion is better for minimizing time for complete reaction and minimizing deviation boundaries. High dispersion is better for dampening out process fluctuations or disturbances.
Martin D. Johnson +8 more
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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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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 times and distribution of residence times in dispersed flow systems
Chemical Engineering Science, 1959Abstract Mathematical expressions are derived for the residence time and the distribution of residence times of falling particles in a turbulent flow system.
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RESIDENCE TIME DISTRIBUTIONS IN A JETLOOP REACTOR
Chemical Engineering Communications, 1995Abstract 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 +3 more
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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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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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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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