ENTROPIC MEASURES OF MIXING IN APPLICATION TO POLYMER PROCESSING

ENTROPIC MEASURES OF MIXING IN APPLICATION TO POLYMER PROCESSING

Bibliographic Details
Main Author: Alemaskin, Kirill
Language:English
Published: Case Western Reserve University School of Graduate Studies / OhioLINK 2004
Subjects:
Plastics Technology
Mixing
Extrusion
Simulations
Polymer Processing
Online Access:http://rave.ohiolink.edu/etdc/view?acc_num=case1098397260
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spelling ndltd-OhioLink-oai-etd.ohiolink.edu-case10983972602021-08-03T05:31:58Z ENTROPIC MEASURES OF MIXING IN APPLICATION TO POLYMER PROCESSING Alemaskin, Kirill Plastics Technology Mixing Extrusion Simulations Polymer Processing Mixing is an important component in most processing operations including but not limited to polymer processing. Generically, mixing refers to a process that reduces composition nonuniformity. Since the entropy is the rigorous measure of disorder or system homogeneity, in this work we will explore various ways to employ the entropy to characterize the state of mixing in a multi-component system. The various species can be initially present in the system or they can evolve as a result of a dispersive mixing operation involving a cohesive minor component. Computer simulation of agglomerate dispersion and sequential distribution of all particles obtained in the system allows us to evaluate the overall mixing efficiency of processing equipment. Evaluation is based on a specific mixing index, calculated using the Shannon entropies for different size fractions. The index can be tailored to give preference to different particle size distributions, thus relating the quality of mixing to specific properties of the final product. We propose a Shannon entropy based index of color homogeneity to assess color homogeneity as well as deviations from a standard/ideal color. We illustrate the concept by analyzing ABS polymeric samples obtained in a single screw extruder by mixing blue and yellow polymer pellets. Alternatively the proposed technique can be employed to assess the efficiency and degree of distributive mixing attained in polymer processing equipment. We present numerical simulations for an ABS resin extrusion in an industrial conventional single screw extruder. Based upon the flow field patterns obtained in the simulations, a particle tracking procedure was employed to obtain information about the spatial distribution of particle tracers of two colors. Results of the simulation were compared with experimental data obtained under similar extrusion conditions. To evaluate the degree of color mixing and color homogeneity for the system, we also employ the entropy based index of color homogeneity for two species populations. 2004-10-22 English text Case Western Reserve University School of Graduate Studies / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=case1098397260 http://rave.ohiolink.edu/etdc/view?acc_num=case1098397260 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws.
collection NDLTD
language English
sources NDLTD
topic Plastics Technology
Mixing
Extrusion
Simulations
Polymer Processing
spellingShingle Plastics Technology
Mixing
Extrusion
Simulations
Polymer Processing
Alemaskin, Kirill
ENTROPIC MEASURES OF MIXING IN APPLICATION TO POLYMER PROCESSING
author Alemaskin, Kirill
author_facet Alemaskin, Kirill
author_sort Alemaskin, Kirill
title ENTROPIC MEASURES OF MIXING IN APPLICATION TO POLYMER PROCESSING
title_short ENTROPIC MEASURES OF MIXING IN APPLICATION TO POLYMER PROCESSING
title_full ENTROPIC MEASURES OF MIXING IN APPLICATION TO POLYMER PROCESSING
title_fullStr ENTROPIC MEASURES OF MIXING IN APPLICATION TO POLYMER PROCESSING
title_full_unstemmed ENTROPIC MEASURES OF MIXING IN APPLICATION TO POLYMER PROCESSING
title_sort entropic measures of mixing in application to polymer processing
publisher Case Western Reserve University School of Graduate Studies / OhioLINK
publishDate 2004
url http://rave.ohiolink.edu/etdc/view?acc_num=case1098397260
work_keys_str_mv AT alemaskinkirill entropicmeasuresofmixinginapplicationtopolymerprocessing
_version_ 1719421352299986944

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