Numerical study on the hydrodynamics of agglomerates at intermediate Reynolds numbers

doi:10.1016/j.cjche.2020.03.032

中国化学工程学报 ›› 2020, Vol. 28 ›› Issue (6): 1533-1541.DOI: 10.1016/j.cjche.2020.03.032

• Fluid Dynamics and Transport Phenomena • 上一篇下一篇

Numerical study on the hydrodynamics of agglomerates at intermediate Reynolds numbers

Huanpeng Liu, Shaowei Wang, Chenyu Yang, Taiping Chen

School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China

收稿日期:2019-11-17 修回日期:2020-02-04 出版日期:2020-06-28 发布日期:2020-07-29
通讯作者: Huanpeng Liu
基金资助:
The authors gratefully acknowledge the financial support of the Natural Science Foundation of Heilongjiang Province of China(E2018031).

Numerical study on the hydrodynamics of agglomerates at intermediate Reynolds numbers

Huanpeng Liu, Shaowei Wang, Chenyu Yang, Taiping Chen

School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China

Received:2019-11-17 Revised:2020-02-04 Online:2020-06-28 Published:2020-07-29
Contact: Huanpeng Liu
Supported by:
The authors gratefully acknowledge the financial support of the Natural Science Foundation of Heilongjiang Province of China(E2018031).

摘要/Abstract

摘要： The flow pattern and hydrodynamics of a heterogeneous permeable agglomerate in a uniform upward flow at intermediate Reynolds numbers (1-40) are analyzed from three-dimensional (3D) computational fluid dynamics simulations. Different from the homogeneous or stepwise-varying permeability models used in previous papers, a continuously radially varying permeability model is used in the present study. The effects of two dimensionless parameters, the Reynolds number and the permeability ratio, on the flow field and the hydrodynamics were investigated in detail. The results reveal that unlike the solid sphere, a small recirculating wake initially forms inside the agglomerate. The critical Reynolds number for the formation of the recirculating wake is lower than that of the solid sphere and it decreases with the increase of permeability ratio. A correlation of drag coefficient as a function of the Reynolds number and permeability ratio is proposed. Comparisons of drag coefficients obtained by different permeability models show that at intermediate Reynolds numbers (1-40), the effect of radially varying permeability on the drag coefficient must be considered.

关键词: Agglomerate, Permeability, Reynolds number, Drag coefficient

Abstract: The flow pattern and hydrodynamics of a heterogeneous permeable agglomerate in a uniform upward flow at intermediate Reynolds numbers (1-40) are analyzed from three-dimensional (3D) computational fluid dynamics simulations. Different from the homogeneous or stepwise-varying permeability models used in previous papers, a continuously radially varying permeability model is used in the present study. The effects of two dimensionless parameters, the Reynolds number and the permeability ratio, on the flow field and the hydrodynamics were investigated in detail. The results reveal that unlike the solid sphere, a small recirculating wake initially forms inside the agglomerate. The critical Reynolds number for the formation of the recirculating wake is lower than that of the solid sphere and it decreases with the increase of permeability ratio. A correlation of drag coefficient as a function of the Reynolds number and permeability ratio is proposed. Comparisons of drag coefficients obtained by different permeability models show that at intermediate Reynolds numbers (1-40), the effect of radially varying permeability on the drag coefficient must be considered.

Key words: Agglomerate, Permeability, Reynolds number, Drag coefficient

Huanpeng Liu, Shaowei Wang, Chenyu Yang, Taiping Chen. Numerical study on the hydrodynamics of agglomerates at intermediate Reynolds numbers[J]. 中国化学工程学报, 2020, 28(6): 1533-1541.

Huanpeng Liu, Shaowei Wang, Chenyu Yang, Taiping Chen. Numerical study on the hydrodynamics of agglomerates at intermediate Reynolds numbers[J]. Chinese Journal of Chemical Engineering, 2020, 28(6): 1533-1541.

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Numerical study on the hydrodynamics of agglomerates at intermediate Reynolds numbers

Numerical study on the hydrodynamics of agglomerates at intermediate Reynolds numbers

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