threshold flow density

例句：

1. 1.The study of the threshold flow density is crucial for understanding the behavior of fluids at the interface between two phases.
   研究门槛流量密度对于理解两种相界面流体的行为至关重要。
2. 2. In this experiment, we measured the threshold flow density of the liquid to determine its viscosity.
   在这个实验中，我们测量了液体的门槛流量密度以确定其粘度。
3. 3. The threshold flow density is a critical parameter in the design of heat exchangers and turbines.
   门槛流量密度是热交换器和涡轮机设计中的一个关键参数。