采用CFD中的Standard k-ε湍流模型模拟板刺式微通道湍流促进器的刺角度及微孔尺寸对浸没式平板膜生物反应器内流场特性的影响,选出对减轻膜污染和浓差极化效果最佳的刺角度及微孔尺寸.在文中通过定性和定量分析附加板刺式微通道湍流促进器后浸没式平板膜生物反应器中的流体速度、静压、湍流动能、湍流强度、湍流耗散率和膜表面剪切力性能指标的变化.从模拟结果可得出,刺角度为60°和微孔半径为0.3 mm时,流体速度、湍流动能和剪切力增加明显,并在微通道湍流促进器附近产生涡,从而能有效强化过滤性能,抑制膜表面滤饼层的形成,减缓膜污染.
Standard k-ε turbulent model in CFD is used to simulate fin angle and micro-pore size of microchannel turbulence promoters having the influence on hydrodynamics in a submerged flat-sheet membrane bioreactor,therefore,the optimum fin angle and micro-pore size of reducing membrane fouling and concentration polarization were obtained.Through the CFD,the qualitative and quantitative performance of hydrodynamics between micro-channel turbulence promoter and flat-sheet membrane channel was obtained according to the distribution of velocity,static pressure,turbulent kinetic energy,turbulent intensity,turbulent dissipation rate and wall shear stress on the membrane surface.The simulation results showed that fin angle 60°and micro-pore radius 0.3 mm of micro-channel turbulence promoters can increase velocity,turbulent kinetic energy and wall shear stress on the membrane surface and produce eddy in the vicinity of micro-channel turbulence promoters which enhance the filtration performance,disrupt the buildup of cake layer and mitigate membrane fouling.
参考文献
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%