Question: Alternate form of the binary diffusion equation, in the absence of chemical reactions, Eq. 19.1-17 can be written in terms of v rather than v*

Alternate form of the binary diffusion equation, in the absence of chemical reactions, Eq. 19.1-17 can be written in terms of v rather than v* by using a different measure of concentration namely, the logarithm of the mean molecular weight: in which M = x_AM_A + x_BM_B. (Caution: Solution is lengthy.) Equation 19C.1-1 is difficult to solve even for the stagnant gas film of S18.2, because of the variable mass density p that appears in the continuity equation (Eq. A of Table 19.2-3)

: In M + (v:Vin) %3D 9 6 . In M t AB

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