Journal of Shandong University(Engineering Science) ›› 2019, Vol. 49 ›› Issue (6): 119-126.doi: 10.6040/j.issn.1672-3961.0.2019.503

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Flow resistance characteristics of wire mesh porous media channel based on pore-scale

Wei HU()   

  1. Licheng Branch, Jinan Municipal Bureau of Ecological Environment, Jinan 250100, Shandong, China
  • Received:2019-09-03 Online:2019-12-20 Published:2019-12-17

Abstract:

Through the pore-scale of the mesh porous media channel numerical analysis, the flow resistance characteristics of wire mesh channel with different geometric parameters were studied, including pressure drop ΔP, viscous resistance Au and inertial resistance Bu2. A three-dimensional steady-state modified k-ωturbulence model was developed by CFD software, and five four-cell pore models with different wire diameters and pore diameters were selected. Numerical analysis on flow resistance characteristics in wire mesh velocity numbers, i.e., from 0.2 m/s to 1.0 m/s were performed. The characteristics of flow in pore-level channels with different configurations under the range of low velocity numbers were obtained. It was shown that the configuration had a significant influence on the nonlinear flow characteristics of the wire mesh channel. The results showed that the smaller the mesh configuration angle (θ=45°~90°), the greater flow resistance in the channel, however, the partial pressure ratio was the same. It also indicated that faster the flow velocity (v=0.2~1.0 m/s), the greater the nonlinear effect and more inertial resistance would be.

Key words: numerical simulation, geometric structure, wire mesh porous media, Forchheimer model, pressure drop

CLC Number: 

  • TB71+2

Fig.1

wire mesh"

Fig.2

The unit of wire mesh"

Table 1

Features of wire screen samples"

丝网构型 纬丝d2/mm 径丝d1/mm 孔径M1/mm 孔径M2/mm 夹角θ1/(°) 夹角θ2/(°)
W45 0.1 0.1 0.3 0.3 45 45
W60 0.1 0.1 0.3 0.3 60 60
W75 0.1 0.1 0.3 0.3 75 75
W90 0.1 0.1 0.3 0.3 90 90

Fig.3

Numerical model, screen with mesh domain"

Fig.4

The W90 verification of grid independence"

Fig.5

W90 comparison between numerical simulation and empirical equation"

Fig.6

W75 comparison between numerical simulation and empirical equation"

Fig.7

W60 comparison between numerical simulation and empirical equation"

Fig.8

W45 comparison between numerical simulation and empirical equation"

Fig.9

W90 pressure drop vs velocity"

Fig.10

W75 pressure drop vs velocity"

Fig.11

W60 pressure drop vs velocity"

Fig.12

W45 pressure drop vs velocity"

Table 2

Fitting coefficients of numercial cases"

丝网 A B K F R2
W90 106.31 439.17 9.93e-10 0.138 99.94
W75 112.81 472.29 9.20e-10 0.143 99.96
W60 140.75 559.53 6.80e-10 0.146 99.67
W45 212.37 832.06 4.70e-10 0.180 99.96

Fig.13

Variation of Forchheimer's coefficients A and B with confining angle"

Fig.14

Pressure drop vs velocity"

Fig.15

Relationship between velocity and proportion of resistance"

Fig.16

Pressure drop vs angle"

Fig.17

Relationship between angle and inertial ratio"

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