Počet záznamů: 1
The effect of primary and secondary flows on the homogenization process in a vertical bladed mixer.
- 1.
SYSNO ASEP 0543766 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název The effect of primary and secondary flows on the homogenization process in a vertical bladed mixer. Tvůrce(i) Havlica, Jaromír (UCHP-M) RID, ORCID, SAI
Kozakovič, M. (CZ)
Kramoliš, D. (CZ)
Trávníčková, Tereza (UCHP-M) RID, ORCID, SAI
Kohout, M. (CZ)Zdroj.dok. Powder Technology. - : Elsevier - ISSN 0032-5910
Roč. 391, OCT 2021 (2021), s. 253-266Poč.str. 14 s. Jazyk dok. eng - angličtina Země vyd. NL - Nizozemsko Klíč. slova discrete element method (DEM) ; granular dynamics ; granular mixing Vědní obor RIV CI - Průmyslová chemie a chemické inženýrství Obor OECD Chemical process engineering CEP GJ19-21114Y GA ČR - Grantová agentura ČR Způsob publikování Open access s časovým embargem (01.11.2023) Institucionální podpora UCHP-M - RVO:67985858 UT WOS 000678458400011 EID SCOPUS 85108992624 DOI 10.1016/j.powtec.2021.06.015 Anotace This article focuses on numerical simulations of the granular mixing process in a vertical cylindrical mixer with two opposed flat blades with a 45° rake angle. Computer simulations were performed by the discrete element method. The blending was examined for the blades' stirrer speeds in the range from 1.9 to 960 rpm and three different initial spatial configurations. The development of the concentration patterns and the evolution of phase interphase between different types of particles have shown that the homogenization process depends not only on the system's dynamics but also on the initial spatial distribution of particles. The dependence on the initial distribution is provided by involving primary and secondary flows in different time-scale in the homogenization process. This ability of the individual flows to engage in the mixing is granted by the mutual synergy between the direction of movements of particles located on the phase interface and the orientation of the phase interface. Because there is a significant difference between the intensity of primary and secondary flows in most cases, an improperly oriented phase interface will significantly slow down the entire rate of the homogenization process. On the other hand, during the mixing process, the phase interface expands and deforms, which gradually also allows the rest of the flows to get involved in the homogenization process. Based on the results, the basic rules have been identified for effective homogenization. As a mixing index, the relative surface of the phase interface was used. By comparing individual homogenization curves, it follows that the critical factor for the homogenization process is the centrifugal force. When it is in balance with other forces, it encourages homogenization. On the contrary, if it becomes the dominant force in the system, it causes a significant deformation of the surface, and its effect on the homogenization process is destructive. Pracoviště Ústav chemických procesů Kontakt Eva Jirsová, jirsova@icpf.cas.cz, Tel.: 220 390 227 Rok sběru 2022 Elektronická adresa http://hdl.handle.net/11104/0321864
Počet záznamů: 1