Investigation of drag properties for flow through and around square arrays of cylinders at low Reynolds numbers

Tang, Tingting1; Yu, Peng1; Shan, Xiaowen1; Che, Huisu2; Su, Jian1

2019-05-18

10.1016/j.ces.2019.01.017

CHEMICAL ENGINEERING SCIENCE   影响因子和分区

0009-2509

1873-4405

The drag properties of flow through and around square arrays of 10 x 10 evenly spaced circular cylinders with a wide range of solid fraction phi from 9.69 x 10(-11) to 0.785 and Reynold number of the array Re from 1 to 50 are investigated numerically. The purpose of the present study is to better understand the phenomena of flow through and around permeable bodies that appear in bioreactors and fluid-solid reactors, for example. Instead of using the semi-empirical porous medium model, the direct numerical simulation is employed in order to investigate the flow mechanism from a microscopic point of view. A peak in drag coefficient is observed for the range of phi investigated, which appears at a smaller phi as Re increases. Three flow regimes are identified based on the shape effects quantified via the averaged velocity within the array, and the drag property in each regime is analyzed. A novel drag formula is also found by investigating the dependence of drag on phi and R (Reynolds number based on the mean velocity within the array). Finally, the dimensionless macroscopic permeability Da is estimated via the Darcy's law. The drag ratio computed is in a good agreement with the previous results from porous media models. (C) 2019 Elsevier Ltd. All rights reserved.

Permeable body Drag Cylinder array Low-Reynolds number flow Fluid mechanics Computational fluid dynamics

SCI ; EI

英语

第一 ; 通讯

Special Program for Applied Research on Super Computation of the NSFC-Guangdong Joint Fund (second phase)[U1501501]

Engineering

Engineering, Chemical

WOS:000460156700024

PERGAMON-ELSEVIER SCIENCE LTD

20190606474564

Circular cylinders ; Computational fluid dynamics ; Drag ; Fluid mechanics ; Porous materials ; Reynolds number

Fluid Flow, General:631.1 ; Mechanics:931.1 ; Materials Science:951

CHEMISTRY

Web of Science

1.Southern Univ Sci & Technol, Dept Mech & Aerosp Engn, Shenzhen 518055, Peoples R China
2.Southeast Univ, Sch Mat Sci & Engn, Jiangsu Key Lab Construct Mat, Nanjing 210018, Jiangsu, Peoples R China

Tang, Tingting,Yu, Peng,Shan, Xiaowen,et al. Investigation of drag properties for flow through and around square arrays of cylinders at low Reynolds numbers[J]. CHEMICAL ENGINEERING SCIENCE,2019,199:285-301.

Tang, Tingting,Yu, Peng,Shan, Xiaowen,Che, Huisu,&Su, Jian.(2019).Investigation of drag properties for flow through and around square arrays of cylinders at low Reynolds numbers.CHEMICAL ENGINEERING SCIENCE,199,285-301.

Tang, Tingting,et al."Investigation of drag properties for flow through and around square arrays of cylinders at low Reynolds numbers".CHEMICAL ENGINEERING SCIENCE 199(2019):285-301.