Scale distributions of fluid interfaces in turbulence

Scale distributions of high- and low-dimensional transects of fluid interfaces in turbulence are analyzed and compared. For mixed-fluid interfaces derived from concentration measurements in turbulent jets at Re ∼10 4 and Sc ∼10 3 , the relative coverage dimensions of spatial two-dimensional and one-dimensional transects agree at the smallest and largest scale, as expected, but are found to be different at intermediate scales: the higher-dimensionality transects have a larger relative coverage dimension and, in this sense, exhibit more structure. This behavior has implications for quantifying turbulent mixing in terms of the geometry of fluid interfaces.