渗透管 meaning in English

osmos tube
permeability tube
permeation tube

Standard practice for calibration techniques using permeation tubes
使用渗透管的校准技术标准实施规范
Standard guide for intercomparing permeation tubes to establish traceability
相互比较渗透管以确定示踪能力的标准指南
Uncoupling method in unsteady transport problems across the wall of the network of permeable tubes
可渗透管网络非定常跨壁传输问题的解耦算法