TORTUOSITY
Definition
A <TORTUOSITY> is a <Property> that is a measure of the geometric complexity of a porous medium. Tortuosity is a ratio that characterizes the convoluted pathways of fluid diffusion and electrical conduction through porous media. In the fluid mechanics of porous media, tortuosity is the ratio of the length of a streamline&amp;#226;€”a flow line or path&amp;#226;€”between two points to the straight-line distance between those points. Tortuosity is thus related to the ratio of a fluid&amp;amp;amp;#39;s diffusion coefficient when it is not confined by a porous medium to its effective diffusion coefficient when confined in a porous medium. Tortuosity is also related to the formation factor, which is the ratio of electrical resistivity of a conductive fluid in a porous medium to the electrical resistivity of the fluid itself