physics

The Interfacial Physics Group

Carnegie Mellon University, Department of Physics

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The Effects of Powder Composition on Surfactant Driven Marangoni Transport

by Xin Zhang

Abstract

In this project, the effect of powder with different amounts of sodium dodecyl sulfate (SDS) on Marangoni flow is investigated. The powder is made by using a spray dryer, then it is added on a thin water sub-phase by a scoop. The powder causes the fluid to move outward along the surface tension gradient. In the sub-phase solution, erythrosine is added and its absorbance change is used to indicate the height change of sub-phase, and the absorbance of fluorescein disodium salt (FDS) in the powder is used to calculate the amount of powder added. The results show that the powder composition and SDS mass added would change the Marangoni rate, outflow volume, shape of flows and number of Marangoni waves.