Granular Dynamics in a Vertical Bladed Mixer: Secondary Flow Patterns.

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985858%3A_____%2F19%3A00497842" target="_blank" >RIV/67985858:_____/19:00497842 - isvavai.cz</a>

Alternative codes found

RIV/60461373:22340/19:43918365 RIV/44555601:13430/19:43895283 RIV/44555601:13440/19:43895283

Result on the web

<a href="http://hdl.handle.net/11104/0294052" target="_blank" >http://hdl.handle.net/11104/0294052</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.powtec.2018.11.094" target="_blank" >10.1016/j.powtec.2018.11.094</a>

Result language

angličtina

Original language name

Granular Dynamics in a Vertical Bladed Mixer: Secondary Flow Patterns.

Original language description

This article deals with numerical simulations and experimental measurements of the granular mixing process in a vertical cylindrical mixer with two opposed flat blades with a 45° rake angle. The computer simulations were conducted via discrete element method. The experimental measurements were recorded by a color high-speed camera. Both approaches describe the mixing process in the same way with significant agreement in observations. Even though the geometry and operating conditions are simple, the dynamics of the system is often very complex and a variety of flow structures can be created. For that reason, the behavior of individual flows patterns was analyzed and discussed. The effect of the centrifugal force on deformation of the free level of the granular material and the formation of empty spaces behind the stirrer blades was described. In addition, the behavior of individual particles in specific regions was characterized. At low rotational speed of the blades, particles tend to move close to the bottom of the vessel behind the stirrer blade towards the shaft. At high values, particles are moving in the exact opposite direction. Described movements near the base of the vessel create secondary flow in the form of recirculation zones. Presence of the secondary flow during the mixing process was also confirmed by the experimental measurements. Based on the acquired knowledge, two competing mechanisms of secondary flow formation were presented: (i) the different contact time of the particles with the blade, (ii) the different magnitude of inertial forces acting on the particles around the stirrer blade.

Czech name

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Czech description

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Type

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

CEP classification

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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

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2019

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

—

Volume of the periodical

344

Issue of the periodical within the volume

FEB 15

Country of publishing house

NL - THE KINGDOM OF THE NETHERLANDS

Number of pages

10

Pages from-to

79-88

UT code for WoS article

000461262200009

EID of the result in the Scopus database

2-s2.0-85057626636