Nonspherical Particles, Drops, and Bubbles

The dependence (4.12.3) can also be used to estimate the intensity of transient mass transfer for nonspherical particles, drops, and bubbles at Pe 1. In this case, all dimensionless variables r, Sh, Shst, and Pe must be defined on the basis of the same characteristic length a. Under this condition, the expression (4.12.3) provides valid asymptotic results for small as well as large times. Equation (4.12.3) can be rewritten as follows  

Later on in Section 5.6 it will be shown that the expression (4.12.7) is also suitable for the description of a broad class of more complicated nonlinear problems of transient diffusion boundary layer. 

---

Formula (5.3.8) and Eq. (5.3.9) can be used for the calculation of the mean Sherwood number for nonspherical particles, drops, and bubbles at high Peclet numbers. 

---