Few authors (for example [9,10]) have conserved the dimensionless
group (kla)
∗ = kla · (l/g2)
1/3 defined by these two pioneer
works for modelling absorption processes. Most of them have
adopted, with or without theoretical backgrounds, others definitions
for making dimensionless kla [11–17]. They include notably
a modified Sherwood number (kla · T2
t /D) or Stanton number
(kla · Vl/Qg) [3].
When shear-thinning fluids are involved, two additional questions
arise unfortunately in a point of view of the theory of
similarity