Flow Pattern and Mixing Characteristics of Highly Viscous Fluid in a Dynamic Mixer

Junhao Wang; Zhipeng Li; Zhengming Gao; J.J. Derksen

Flow Pattern and Mixing Characteristics of Highly Viscous Fluid in a Dynamic Mixer

Junhao Wang, Zhipeng Li^* (Corresponding Author), Zhengming Gao^* (Corresponding Author), J.J. Derksen

^*Corresponding author for this work

Engineering

Beijing University of Chemical Technology

Research output: Contribution to journal › Article › peer-review

Abstract

Computational fluid dynamics (CFD) was used to assess the flow pattern and mixing characteristics of highly viscous fluids in a dynamic mixer. The simulated concentration distribution was validated by the data measured by planar laser induced fluorescence (PLIF). The refractive indices of the two fluids and the
transparent solid material comprising the mixer are matched to minimize bending of sent and received light. Simulated concentration fields agree well with measured concentration fields. The flow pattern and mixing performance were quantitatively evaluated by using the mixing index λ and the coefficient of variation (COV), respectively. After the mixing performance reaches time-independence, a reduction of COV at the outlet is associated with a slight increase of the volume averaged |λ|. The results suggest that elongational flow is more effective than shear flow in obtaining a more uniform concentration distribution in highly viscous fluids.

Original language	English
Journal	Industrial and Engineering Chemistry Research
Publication status	Accepted/In press - 9 Feb 2024

Bibliographical note

Acknowledgements
The authors gratefully acknowledge financial support from the National Natural Science Foundation of China (No.22178014), and it was essential to the success of this research project.

Keywords

Highly viscous fluid
Planar laser-induced fluorescence
Refractive index matching
Species transport
Dynamic mixer

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Cite this

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title = "Flow Pattern and Mixing Characteristics of Highly Viscous Fluid in a Dynamic Mixer",

abstract = "Computational fluid dynamics (CFD) was used to assess the flow pattern and mixing characteristics of highly viscous fluids in a dynamic mixer. The simulated concentration distribution was validated by the data measured by planar laser induced fluorescence (PLIF). The refractive indices of the two fluids and thetransparent solid material comprising the mixer are matched to minimize bending of sent and received light. Simulated concentration fields agree well with measured concentration fields. The flow pattern and mixing performance were quantitatively evaluated by using the mixing index λ and the coefficient of variation (COV), respectively. After the mixing performance reaches time-independence, a reduction of COV at the outlet is associated with a slight increase of the volume averaged |λ|. The results suggest that elongational flow is more effective than shear flow in obtaining a more uniform concentration distribution in highly viscous fluids.",

keywords = "Highly viscous fluid, Planar laser-induced fluorescence, Refractive index matching, Species transport, Dynamic mixer",

author = "Junhao Wang and Zhipeng Li and Zhengming Gao and J.J. Derksen",

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journal = "Industrial and Engineering Chemistry Research",

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T1 - Flow Pattern and Mixing Characteristics of Highly Viscous Fluid in a Dynamic Mixer

AU - Wang, Junhao

AU - Li, Zhipeng

AU - Gao, Zhengming

AU - Derksen, J.J.

N1 - Acknowledgements The authors gratefully acknowledge financial support from the National Natural Science Foundation of China (No.22178014), and it was essential to the success of this research project.

PY - 2024/2/9

Y1 - 2024/2/9

N2 - Computational fluid dynamics (CFD) was used to assess the flow pattern and mixing characteristics of highly viscous fluids in a dynamic mixer. The simulated concentration distribution was validated by the data measured by planar laser induced fluorescence (PLIF). The refractive indices of the two fluids and thetransparent solid material comprising the mixer are matched to minimize bending of sent and received light. Simulated concentration fields agree well with measured concentration fields. The flow pattern and mixing performance were quantitatively evaluated by using the mixing index λ and the coefficient of variation (COV), respectively. After the mixing performance reaches time-independence, a reduction of COV at the outlet is associated with a slight increase of the volume averaged |λ|. The results suggest that elongational flow is more effective than shear flow in obtaining a more uniform concentration distribution in highly viscous fluids.

AB - Computational fluid dynamics (CFD) was used to assess the flow pattern and mixing characteristics of highly viscous fluids in a dynamic mixer. The simulated concentration distribution was validated by the data measured by planar laser induced fluorescence (PLIF). The refractive indices of the two fluids and thetransparent solid material comprising the mixer are matched to minimize bending of sent and received light. Simulated concentration fields agree well with measured concentration fields. The flow pattern and mixing performance were quantitatively evaluated by using the mixing index λ and the coefficient of variation (COV), respectively. After the mixing performance reaches time-independence, a reduction of COV at the outlet is associated with a slight increase of the volume averaged |λ|. The results suggest that elongational flow is more effective than shear flow in obtaining a more uniform concentration distribution in highly viscous fluids.

KW - Highly viscous fluid

KW - Planar laser-induced fluorescence

KW - Refractive index matching

KW - Species transport

KW - Dynamic mixer

M3 - Article

SN - 0888-5885

JO - Industrial and Engineering Chemistry Research

JF - Industrial and Engineering Chemistry Research

ER -

Flow Pattern and Mixing Characteristics of Highly Viscous Fluid in a Dynamic Mixer

Abstract

Bibliographical note

Keywords

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