Abstract
Flow properties of several types of surfactant solutions passing through various sizes of small apertures were investigated in this study. Different fl w properties were found for the various surfactant solutions depending on the charge of the solute. For an anionic surfactant solutions, the resultant pressure drops were similar to those for water, whereas in the case of a cationic surfactant solutions, pressure drops decreased greatly in comparison with the other surfactant solutions. A non-ionic surfactant exhibited a steep rise in the pressure drop at a particular value of the Reynolds number. In explaining this behavior, the liquid-solid interface and alignment of the surfactant micelles are considered, and consequently, it is strongly suggested that the elastic stress is a contributing factor.
