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Flux and Flow rate conversion 
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#1
Jul2810, 07:47 AM

P: 1

Hi,
I am performing a helium leak experiment in which the detector outputs a number in mbar.L/s which is the amount of helium permeating through a specimen at a given pressure per unit of time. I am interested in obtaining a permeability coefficient (K) for this specimen for the given pressure with helium as the working fluid. My equation is: K = J . delta x / delta P (rearrange Fick's 1st Law) I know delta x (thickness) and delta P (pressure), however I am having trouble converting the mbar.L/s (leak rate) to a flux J (which I believe is in (mol /m^2 . s) for the equation. Can somebody please help. Alex 


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