SK型静态混合器流体湍流阻力的研究

为了获得流体在SK型静态混合器中湍流流动时的流动阻力规律,提出一种新的流体阻力的计算模型。在流体不可压缩的假设前提下,将流体在SK型静态混合器中的螺旋形运动分解成轴向直线运动和环向旋转运动。在流体作湍流流动时,运用流体力学理论,分别求解出流体作2种运动时所产生的流体阻力的计算式,然后进行叠加得到SK型静态混合器湍流时流体阻力理论计算式。以水为实验介质,对SK型静态混合器流体湍流阻力进行了实验测量,回归出实验公式。与理论结论进行比较分析,得出流动摩擦系数与雷诺数的负0.25次幂呈线性关系的结论。

Flow resistance researches for SK static mixer tube of turbulent flow

In order to acquire turbulent flow resistance rule in SK static mixer, a new numerical model of fluid resistance was put forward.Under the precondition of incompressible flow,fluid spiral motion in SK static mixer tube was resolved into axial beeline motion and circumferential rotation motion.With the theories of hydromechanics,the fluid resistance expressions of the two motions under the state of turbulent flow were obtained individually.After that,by reduplicating them,the calculating formula of SK static mixer for flow resistance was drawn.With water as experimental fluid,the turbulent fluid resistance in the SK static mixer was measured and the experimental formula was regressed by this experiment.By comparing and analyzing the theoretical results and experimental conclusions,a linear relationship between fluid friction factor and negative one fourth power of Renault number was concluded.