By the analysis of strain rate,it can be concluded that the pin can effectually intensify the strain rate of sizing and reduce the low strain rate area near the root of crew thread.

• 通过实验及理论分析,系统研究了取样剪切对管输原油流变性的影响,根据鲁宁线运行工况,计算了阀门节流剪切及过泵剪切时剪切率的大小。