Campus Units

Mechanical Engineering, Chemical and Biological Engineering

Document Type

Conference Proceeding

Conference

ASME 2014 Fluids Engineering Division Summer Meeting

Publication Version

Published Version

Publication Date

2014

Journal or Book Title

Proceedings of the ASME 2014 4th Joint US-European Fluids Engineering Division Summer Meeting (FEDSM2014)

Volume

1D

Issue

FEDSM2014-21048

First Page

V01DT26A001

DOI

10.1115/FEDSM2014-21048

Conference Date

August 3–7, 2014

City

Chicago, IL

Abstract

Granular mixing processes are commonly used to increase product homogeneity in many industrial applications involving pharmaceuticals, food processing, and energy conversion. Determining the appropriate granular mixing length is necessary to avoid over/under mixing and unnecessary power consumption. The goal of this study is to experimentally characterize the granular mixing process and determine, under various operating conditions, the needed mixing length to achieve adequate mixing in a laboratory-scale double screw mixer. Nine different combinations of screw rotation speeds and dimensionless screw pitches are used to investigate the rate of mixing at dimensionless mixing lengths of L/D = 2, 5, and 10. Composition and statistical analysis methods are employed to assess mixing effectiveness, and it is determined that the dimensionless mixing length is the most influential parameter in terms increasing granular homogeneity. For all the conditions tested, the granular mixture approaches an acceptable level of mixing for all testing conditions when the dimensionless mixing length is L/D = 10. However, the segregation rate throughout the screw mixer is vastly different for various combinations of screw rotation speed and dimensionless screw pitch, and is partly attributed to the influence of entrance effects caused by the material injection process.

Comments

This is a proceeding published as Kingston, T.A., and Heindel, T.J., “Characterizing Granular Mixing Homogeneity at Various Dimensionless Mixing Lengths in a Double Screw Mixer,” Proceedings of the ASME 2014 Fluids Engineering Division Summer Meeting, August 3-7, 2014, Chicago, Illinois Paper FEDSM2014-21048, 2014. DOI: 10.1115/FEDSM2014-21048. Posted with permission.

Copyright Owner

ASME

Language

en

File Format

application/pdf

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