Journal ArticleDOI
Estimation of time delay time constant parameters in time, frequency, and laplace domains
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In this paper, four methods are proposed for estimating the dominant time constant and dead time of a given process from a knowledge of its moments, s-plane, frequency or transient response data, which are faster and simpler and, in terms of accuracy and reliabiltiy, are comparable to the time domain least squares procedure for parameter estimation.Abstract:
Four methods are proposed for estimating the dominant time constant and dead time of a given process from a knowledge of its moments, s-plane, frequency or transient response data. The methods are faster and simpler and, in terms of accuracy and reliabiltiy, are comparable to the time domain least squares procedure for parameter estimation. Applications of the methods are illustrated with the aid of a dispersion model. A comparison is also made with other known techniques to demonstrate the superiority of the suggested methods.read more
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References
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Journal ArticleDOI
Handbook of Mathematical Functions
Journal ArticleDOI
Longitudinal dispersion of liquid flowing through fixed and fluidized beds
S. F. Chung,C. Y. Wen +1 more
TL;DR: In this article, a systematical study of liquid phase dispersion by varying particle size, fluid velocity, fraction voids, and particle density was conducted and a generalized correlation applicable to both fixed bed and fluidized bed was obtained.
Journal ArticleDOI
The diffusion model of longitudinal mixing in beds of finite length. Numerical values
TL;DR: In this paper, the authors provided accurate numerical values for the solution of the diffusion model of miscible fluid displacement in beds of finite length, where a solute, uniformly distributed throughout the medium at the outset of the experiment, is displaced by a solvent which may itself contain some of the solute.
Book ChapterDOI
Patterns of Flow in Chemical Process Vessels
TL;DR: This chapter focuses on two idealized patterns, plug flow and back-mix flow, which give information on how long various elements of fluid spend in the reactor but not on the detailed exchange of matter within and among the elements.
Journal ArticleDOI
On the use of the imperfect tracer pulse method for determination of hold-up and axial mixing†
K. Øsstergaard,M. L. Michelsen +1 more
TL;DR: In this article, the authors discussed two problems connected with reduction of the experimental data obtained in such studies and proposed a semi-empirical method for correction of experimental data in such cases.