University of North Florida
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Stuart Chalk, Ph.D.
Department of Chemistry
University of North Florida
Phone: 1-904-620-1938
Fax: 1-904-620-3535
Email: schalk@unf.edu
Website: @unf

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Octave Levenspiel

Abbrev:
Levenspiel, O.
Other Names:
Address:
Department of Chemical Engineering Oregon State University, 102 Gleeson Hall, Corvallis, OR 97331-2702 USA
Phone:
1-541-737-3618
Fax:
1-541-737-4600

Citations 6

"Longitudinal Mixing Of Fluids Flowing In Circular Pipes"
Ind. Eng. Chem. 1958 Volume 50, Issue 3 Pages 343-346
Octave Levenspiel

Abstract: Charts which were based on the assumption that longitudinal fluid mixing is analogous to the process of diffusion were constructed by using data from literature. These data, which were obtained under widely varying conditions, fell in a narrow band in the turbulent region. However, the charts have only limited application in the streamline region. The diffusion model is based on the use of a straight pipe, which most of the data used did not satisfy. Pipe roughness and curvature have been shown to increase mixing. Further experimentation was recommended for the streamline region, to narrow the range of uncertainty in the curves used in the turbulent region, and to determination the role of the Schmidt number at low Reynolds numbers.
Theory Mixing Diffusion Straight tube Turbulent flow

"Tracer Curves And The Residence Time Distribution"
Chem. Eng. Sci. 1970 Volume 25, Issue 10 Pages 1611-1613
Octave Levenspiel, B. W. Lai and C. Y. Chatlynne

Abstract: For a pulse input, the shape of the output tracer curve depends on the way the tracer is distributed across the flowing fluid, and the way it is measured. The authors properly relate the different curves that may be obtained for flows with negligible cross diffusion, and show which one of these represents directly the residence time distribution of the flowing fluid.
Theory Diffusion

"The Interpretation Of Residence-time Experiments"
Chem. Eng. Sci. 1970 Volume 25, Issue 10 Pages 1605-1609
Octave Levenspiel and J. C. R. Turner

Abstract: The results of tracer experiments can depend on the methods of injection and measurement of the tracer when the fluid velocity is not uniform through the injection and measurement planes. Some simple examples show that incorrect residence-time distributions will be derived if this fact is not considered. For laminar flow in a tube, the results obtained will differ widely, depending on the techniques used.
Theory Injection technique Laminar flow

"Fluid Dispersion-generalization And Comparison Of Mathematical Models. 2. Comparison Of Models"
Chem. Eng. Sci. 1962 Volume 17, Issue 4 Pages 257-264
K. B. Bischoff and Octave Levenspiel

Abstract: The models for axial-dispersed plug flow and dispersed plug flow are interrelated and are also related to more general models which do not assume plug flow and constant values for the dispersion coefficients. These relations are considered with restrictions.
Theory Dispersion Plug flow

"Fluid Dispersion-generalization And Comparison Of Mathematical Models. 1. Generalization Of Models"
Chem. Eng. Sci. 1962 Volume 17, Issue 4 Pages 245-255
K. B. Bischoff and Octave Levenspiel

Abstract: Methods for handling mixing have been based on models that use diffusion equations with modified diffusion coefficients. These are called dispersion models. The relation between all models which have been used is summarized, and the associated measurement techniques are generalized. A quantitative evaluation of the error involved with a given model can be made.
Theory Diffusion Dispersion Diffusion coefficients Mixing

"Diffusion-type Model For The Longitudinal Mixing Of Fluids In Flow"
Chem. Eng. Sci. 1957 Volume 6, Issue 4-5 Pages 227-233
Octave Levenspiel and W. K. Smith

Abstract: Longitudinal mixing may be characterized by a coefficient analogous to the coefficient of molecular diffusion. The Peclet number can be used as a similarity criterion for longitudinal mixing. The skewness of concentration from the concentration peak must be carefully recognized in interpreting experimental data and examined in view of the pertinent Peclet no.
Diffusion Theory Mixing