The effect of primary and secondary flows on the homogenization process in a vertical bladed mixer.

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985858%3A_____%2F21%3A00543766" target="_blank" >RIV/67985858:_____/21:00543766 - isvavai.cz</a>

Alternative codes found

RIV/44555601:13440/21:43896490 RIV/60461373:22340/21:43922741

Result on the web

<a href="http://hdl.handle.net/11104/0321864" target="_blank" >http://hdl.handle.net/11104/0321864</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.powtec.2021.06.015" target="_blank" >10.1016/j.powtec.2021.06.015</a>

Result language

angličtina

Original language name

The effect of primary and secondary flows on the homogenization process in a vertical bladed mixer.

Original language description

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.

Czech name

—

Czech description

—

Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

20402 - Chemical process engineering

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2021

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Powder Technology

ISSN

0032-5910

e-ISSN

1873-328X

Volume of the periodical

391

Issue of the periodical within the volume

OCT 2021

Country of publishing house

NL - THE KINGDOM OF THE NETHERLANDS

Number of pages

14

Pages from-to

253-266

UT code for WoS article

000678458400011

EID of the result in the Scopus database

2-s2.0-85108992624