Asymptotes of maximum friction and heat transfer reductions for drag-reducing surfactant solutions

摘要

A new maximum drag reduction asymptote (MDRA) for surfactant solutions is presented. Various concentrations including cationic and non-ionic surfactant solutions were used to experimentally determine this asymptote. It is shown that if solvent viscosity is used to compute Reynolds and Prandtl numbers for viscous solutions, it leads to underes- timations of the friction coefficient.