“…Although computational fluid dynamics (CFD) methods have been implemented to study both, velocity and concentration profiles, it is interesting to provide analytical solutions (Zhang, Xu, & Li, 2012;Xue-Yi, Zhang, & Zheng, 2014) to describe phenomena such as flow in rotor-stator mixers (Barailler, Heniche & Tanguy, 2006. ), in helical coils (Trivedi & Vasudeva, 1975;Daskopoulos & Lenhoff, 1988), mixed convection in horizontal tubes (Chae & Chung, 2014) and free convection from horizontal cylinders (Chandra & Chhabra, 2012), all these under a laminar regime.…”