International audienceThe aim of this note is mainly to report some experimental results obtained for mass transport under controlled flow conditions in a system where convection and diffusion are coupled with chemical reactions. One special point of the process is that the different time scales for convection-diffusion and physico-chemical processes are of the same order thus leading to a possible optimisation of the process. Then a phenomenological description is suggested giving a possible description of the process. The context of the problem is of crucial practical importance in the framework of medical application and can be described in the following way
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