Two-dimensional shear rate field and flow structures of a pseudoplastic fluid in a stirred tank using particle image velocimetry

被引：32

作者：

Ayala, Jenniffer Solange ^{[1
]}

de Moura, Helder Lima ^{[2
]}

Amaral, Rodrigo de Lima ^{[3
]}

Oliveira Junior, Francisco de Assis ^{[1
]}

Nunhez, Jose Roberto ^{[1
]}

de Castilho, Guilherme Jose ^{[1
]}

机构：

[1] Univ Estadual Campinas, Sch Chem Engn, Albert Einstein Ave 500, BR-13083852 Campinas, SP, Brazil

[2] Univ Estadual Campinas, Ctr Petr Studies, Cora Coralina St 350, BR-13083896 Campinas, SP, Brazil

[3] Polytech Sch Univ Sao Paulo, Dept Mech Engn, Prof Mello Moraes Ave 2231, BR-05508030 Sao Paulo, SP, Brazil

来源：

CHEMICAL ENGINEERING SCIENCE | 2022年 / 248卷

关键词：

Shear rate; Pseudoplastic fluid; PIV; Stirred tank; ANGLE-RESOLVED PIV; ENERGY-DISSIPATION; POWER-CONSUMPTION; COMPLEX FLUIDS; CFD; DYNAMICS; HYDRODYNAMICS; DEFORMATION; IMPELLERS; AGITATION;

D O I：

10.1016/j.ces.2021.117198

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

For non-Newtonian fluids, an accurate determination of the shear rate is essential to optimize process parameters, which can lead to the improvement of the process efficiency. This work proposes the evaluation of an aqueous solution of carboxymethylcellulose (CMC) analyzing two azimuthal planes, AZ 0 degrees and 45 degrees, and four blade positions, AR 0 degrees, 22.5 degrees,45 degrees and 67.5 degrees, by ensemble-averaged and angle-resolved PIV measurements, respectively, in a stirred tank equipped with a pitched-turbine impeller. Results are shown in terms of time-averaged velocity, shear rate, apparent viscosity and Reynolds number fields. Differences between both PIV measurements approaches were significant in terms of velocity magnitude and characteristics of trailing vortices. The results demonstrate that the shear rate is strongly influenced by spatial resolution. The highest shear rates were obtained in the impeller region. The presence of a vortex above the blade resulted in high values of local Reynolds number, reflecting the presence of turbulence in that region. (c) 2021 Elsevier Ltd. All rights reserved.

引用

页数：14

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