基于孔隙尺度下丝网多孔介质通道流阻特性

基于丝网多孔介质孔隙通道数值分析,研究不同几何参数的丝网多孔介质通道内的流阻特性ΔP、黏性阻力Au与惯性阻力Bu²等变化特性。通过CFD软件建立三维稳态修正k-ω湍流模型保证计算精度,并选择5种不同丝径和孔径的4单元孔隙模型,开展低入口流速范围内的流阻特性研究。根据数值分析结果,得到不同构型下孔隙级通道的流阻特性,显示出构型对丝网通道内非线性流动阻力特性产生的显著影响。结果表明,丝网构型角度越小(θ=45°~90°),通道内流动阻力越大,而分压占比规律一致;流速越大(v=0.2~1.0 m/s),则非线性作用越大,惯性阻力占比越多。

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

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.