By James N., Jr. Pitts
Content material: Advances in Photochemistry; Contents; Vapor part Photochemistry of the impartial Oxides and Sulfides of Carbon; Photolysis of Saturated Alcohols, Ethers, and Amines; Excitation and Deexcitation of Benzene; basic Photoprocesses o f Organo-Transition steel Compounds; Intramolecular Proton move in Electronically Excited Molecules; Excited nation habit of a few Bichromophoric structures; topic Index
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1. Diffusive Fluxes Binary Mixture. Diffusion in the Molecular Regime at Constant Pressure. Fick's Law Our phenomenological description showed that the diffusion of a given species depends directly on the concentration gradient of that species: the larger the gradient, the greater the diffusive flux. 32) where DAB is a proportionality constant that we will call the binary molecular diffusivity of A in B. asses of A and B. 32) is known as Fick's law or as Fick's first law. When this law was first formulated and for a long time afterward, there was no precise statement as to which flux (diffusive or total diffusive) was to be set equal to DAB V nA.
Since in molecule-molecule collisions the molecules simply exchange momenta and the total momentum is conserved, the total momentum lost by all species through molecule-molecule collisions is zero. On the other hand, the total momentum lost by the system through molecule-wall collisions is zero only when the pressure is uniform. This has an important consequence. When the diffusion regime is molecular it is customary and correct to state that wall effects are negligible for diffusion. But this is not to be confused with the absence of walls.
A volume element centered on z 0 , and the molecular flux vectors at z 0 , z 0 - ktlz, and z 0 + ktlz. t ',...... I I I I z. I Az- z 30 Chapter 1 Sec. 4 properties are defined for an arbitrary given point. This means that az~o and fluxes are defined for the arbitrary plane at z = z 0 (the fact that a one-dimensional example is being considered enables us to define properties for a plane rather than for a point). Let us assume that a quasi-steady-state has been reached by the system (cf. 3). , the average molecular velocity -IJM = 0.