Determination the efficiency of open mixing screws
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DOI 10.1007/s12206-020-0508-6
Journal of Mechanical Science and Technology 34 (6) 2020 Original Article DOI 10.1007/s12206-020-0508-6 Keywords: · Mixing screws · Discrete element method · Granular materials · Mixing efficiency
Correspondence to: Attila Varga [email protected]
Citation: Varga, A., Keppler, I., Fenyvesi, L. (2020). Determination the efficiency of open mixing screws. Journal of Mechanical Science and Technology 34 (6) (2020) ?~?. http://doi.org/10.1007/s12206-020-0508-6
Determination the efficiency of open mixing screws Attila Varga, Istvan Keppler and Laszlo Fenyvesi Faculty of Mechanical Engineering, Szent Istvan University, Pater K. 1, Godollo, Hungary
Abstract
Our goal is the determination of the material flow processes around the mixing screws and introducing a new mixing index which can characterize the performance of open mixing screws. The validation of the new discrete element model is demonstrated by experimental results of our self-developed apparatus. To quantify the mixing efficiency of open mixing screws we use the value of mixed volume around the screws. Sensitivity analysis is used to analyze how the different values of leaf diameter, pitch and angular velocity affect the mixed volume.
1. Introduction Received August 22nd, 2019 Revised
February 10th, 2020
Accepted March 19th, 2020 † Recommended by Editor Chongdu Cho
© The Korean Society of Mechanical Engineers and Springer-Verlag GmbH Germany, part of Springer Nature 2020
Mixing plays a significant role in agricultural and pharmaceutical industry. Modeling the mixing process is one of the most complicated problem within granular matters [1]. It is very important to specify precisely the geometrical characteristics and the operating settings of the mixers and conveyors. Material transport in conveyors is well known field of engineering [2, 3]. Some experimentally investigations were capable to follow or model the motion of the granular assembly in conveyors [4, 5]. The effect of geometrical parameters of the screw augers on the degree of mixing were also investigated [6, 7]. The guidelines for the selections of particle mixers are still not fully developed and predictions of the mixture quality after mixing operations are still not possible [8]. A wide variety of mixing indexes are used to quantify the mixing performance such as average height method, nearest neighbor method, generalized mean mixing index (GMMI), Lacey method, coordination number method, subdomain-based mixing index etc. [9-11]. These indexes are well used tools to determine the mixing performance of rotating drums [12], vibrated vessels [13], fluidized beds [14] etc. All of the experimental and numerical investigations the motion of the granular media is bounded by the wall of the mixer and the mixing element can mix most of the granular media. There are some cases where the open mixing screws operate in a very large storage area such as silos or silo dryers. Researchers and engineers working in this field rely heavily on empirical data in design a
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