unidirectional flux

u·ni·di·rec·tion·al flux

the flux of a substance from one surface of a boundary layer or membrane to the other, disregarding any counterbalancing flux in the other direction, as measured by tracer technique.
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An energy balance considering unidirectional flux heat through the wall and the reaction term allowed us to predict conversion-temperature trajectories for each thermocouple position (see Fig.

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