Fick's law


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Fick's law

[′fiks ‚lȯ]
(physics)
The law that the rate of diffusion of matter across a plane is proportional to the negative of the rate of change of the concentration of the diffusing substance in the direction perpendicular to the plane.
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Table 1: Factors and Levels of Experimental design for the study Factors Levels 1 2 3 Sulphiting O ppm 1500 ppm 2500 ppm Sucrose/osmosis 0% 40% 60% Drying condition 70[degrees]C/10 h 50[degrees]C/16 h (Temperature/ Time) Table 2: Effective Diffusion Coefficients Deff from Fick's Law on pretreated pineapple slices during drying [D.
The described changes of the mass transfer characteristics allow us to assume that different mass transfer mechanisms may govern the diffusion process in the various structural areas of the composites: if the dispersed phase is impermeable to penetrant molecules, the mass transfer properties of the composites are characterized by macroscopic diffusion coefficients and the sorption kinetics is governed by Fick's law [13].
Thus, an impermeable reference plane below a measured trace can be considered a "virtual center" for the purposes of this model and will be at the location x = 0 for the purposes of modeling change in transmission line loss due to moisture absorption with Fick's law.
The objective of this work is to examine the solution to Fick's law diffusion equation for the formation of polymer coatings by evaporation from water or other aqueous dispersions.
This supposition correlates also well with the results of Aniskevich (26), where the experimental investigation of water absorption of EDT-10 epoxy was done at different values of relative humidity [Phi] of the air and it was shown that the diffusion of water molecules from the humid air can be described by Fick's law with an acceptable accuracy.
Figure 1 Fick's law of diffusion Fick's law of diffusion F=DA[DELTA]C/l