旋流器内两种非牛顿流体的流动行为分析

Analysis on Flow Characteristics of Two Non-Newtonian Fluids in Hydrocyclone

通过雷诺应力计算方法(RSM)分析了四参数模式与幂律模式钻井液在75mm直径双入口旋流器内的流动行为差异。对物理模型以及计算模型进行了准确性验证并旋流场的速度场、压力场及湍流强度进行分析。结果表明:模拟值与实验结果吻合良好;四参数模式切向速度略低于幂律模式;二者轴向速度与径向速度差异主要出现在溢流管内,四参数模式上行流速度明显低于幂律模式。零轴速包络面形状相似,但四参数模式循环流区域比幂律模式循环流区域大,颗粒停留时间更长。四参数模式旋流场压力损失与压力梯度力均小于幂律模式。

Through the Reynolds stress calculation method(RSM), the difference in the flow behavior of the drilling fluid between the four-parameter mode and the power-law mode in the 75 mm diameter double inlet cyclone was analyzed. The physical model and calculation model were verified for accuracy, and the velocity field, pressure field and turbulence intensity of the swirling field were analyzed. The results showed that the simulated values were in good agreement with the experimental results;the tangential velocity in the four-parameter mode was slightly lower than that in the power law mode;the difference between the axial and radial velocities of the two was mainly in the overflow tube, and the upstream velocity in the four-parameter mode was significantly lower than that in the power law mode. The zero-axis velocity envelope surface was similar in shape, but the four-parameter mode circulating flow area was larger than the power law mode circulating flow area, and the particle residence time was longer. The pressure loss and pressure gradient force of the four-parameter mode swirl field were smaller than those of the power law mode.