用PROII如何算管道阻力? 这个单元操作应该很简单啊,就是简单的内径长度之类的。 用了一下pipe,提示还好输液体粘度,什么的 ,在哪输呀, 错误信息: ** error *** unit 1, 'pi1' - liquid viscosity, vapor viscosity, and surface tension methods are required by the pipe unit. ensure that methods are declared for them in the thermodynamic method set assigned to this pipe unit. 查看更多