【摘要】 将泡沫流体近似为弥散流,基于有限元法,采用Fluent软件,选择Spalart-Allmaras单方程模型模拟压缩空气泡沫在管道内的运输,对压缩空气A类泡沫的流变特性和水平管道阻力损失进行研究。泡沫在低剪切速率为非牛顿流体,高剪切速率时近似为牛顿流体,黏度值为0.04 Pa·s。Spalar-Allmaras模型计算值的相对误差基本在10%以内,得到范宁摩擦因子与雷诺数拟合关系式为λ=7.281 9/Re0.620 1。更多还原

【Abstract】 Based on finite element method and the foam fluid was approximately dispersed flow,Spalart-Allmaras model was chosen to simulate the compressed air foam transport in tube using Fluent software. The rheological properties and pressure drop of compressed air foam were researched. Foams of class A showed non-Newtonian at low shear rate, otherwise, it could be seen as Newtonian fluid at high shear rate, the value of apparent viscosity was about 0.04 Pa · s. Comparing to experimental value, the relative error of pressure drop in horizontal pipe could be controlled within 10%. The fitting equation of fanning friction factor and Reynolds number is λ = 7.281 9/Re0.620 1.更多还原