Effect of mass transfer rate on the concentration profiles (a) Combine the result in Eq. 18.2-11 with

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Effect of mass transfer rate on the concentration profiles 

(a) Combine the result in Eq. 18.2-11 with that in Eq. 18.2-14 to get

(b) Obtain the same result by integrating Eq. 18.2-1 directly using the fact that NAz is constant. 

(c) Note what happens when the mass transfer rate becomes small. Expand Eq. 18B.3-1 in a Taylor series and keep two terms only, as is appropriate for small NAz. What happens to the slightly curved lines in Fig. 18.2-1 when NAz is very small?

(NAL(z – z,) D AB 1- XA exp 1 - Хл1

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