Question: Slow forced convection mass transfer into a laminar boundary layer, this problem illustrates the use of Eqs. 20.2-55 and 57 and tests their accuracy. (a)
Slow forced convection mass transfer into a laminar boundary layer, this problem illustrates the use of Eqs. 20.2-55 and 57 and tests their accuracy.
(a) Estimate the local evaporation rate, nA0, as a function of x for the drying of a porous water-saturated slab, shaped as in Fig. 20.2-2. The slab is being dried in a rapid current of air, under conditions such that wA0 = 0.05, wA∞ = 0.01, and Sc = 0.6. Use Eq. 20.2-55 for the calculation.
(b) Make an alternate calculation of tIA0 using Eq. 20.2-57.
(c) For comparison with the preceding approximate results, calculate nA0 from Eq. 20.2-47 and Table 20.2-2. The K values found in (a) will be sufficiently accurate for looking up II'(0, Sc, K).
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