Linear and nonlinear interface model based on the electric double layer theory

Aqueous solutions and liquid metals in contact with other phases or components experience strong Coulomb forces at their interface. To account this effect an electrical double layer at these liquid interfaces is introduced in the classical fluid dynamics. Coupling the electrostatic equations with the hydrodynamic equations, a microscopic model for a surface layer of finite thickness is developed. The model is based on an infinitely thin layer right at the surface, which includes all molecular surface effects empirically and a layer of finite thickness next to it, in which ions are distributed according to a Boltzmann function. A validation is performed by comparing the analytical results for the surface tension with experimental findings for the contact angle of liquid droplets on a solid surface, and the pressure drop in a micro channel. (orig.)SIGLEAvailable from TIB Hannover: ZA 5141(6669) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman