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A comment on Unimpeded Permeation of Water Through Helium-Leak–Tight Graphene-Based Membranes. Parent comment

Re:Unimpeded Permeation of Water Through Helium-Leak–Tight G... by jojobas on Wednesday February 15, 2023 @09:00PM (#34813973)
No, it's just that there is a friction-like loss for getting any amount of water through the membrane. See here. https://sci-hub.ru/10.1016/j.desal.2015.01.005
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Re:Unimpeded Permeation of Water Through Helium-Leak–Tight G... by twawaaay on Wednesday February 15, 2023 @09:08PM (#34814041)
"The trends from the analysis presented in this paper show that in both seawater and brackish desalination we are approaching thermodynamic limitations."

That's excerpt from the article you linked.

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Re:Unimpeded Permeation of Water Through Helium-Leak–Tight G... by jojobas on Wednesday February 15, 2023 @09:12PM (#34814071)
No, it's not quite like that.

With pipes there's a linear (or quadratic for turbulent flow) resistance, low pressure still results in some flow.

With membranes you have a threshold pressure below which you get no flow at all.

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