Scale distributions of fluid interfaces in turbulence

Scale distributions of high- and low-dimensional transects of fluid interfa ces in turbulence are analyzed and compared. For mixed-fluid interfaces der ived from concentration measurements in turbulent jets at Re similar to 10( 4) and Sc similar to 10(3), the relative coverage dimensions of spatial two -dimensional and one-dimensional transects agree at the smallest and larges t scale, as expected, but are found to be different at intermediate scales: the higher-dimensionality transects have a larger relative coverage dimens ion and, in this sense, exhibit more structure. This behavior has implicati ons for quantifying turbulent mixing in terms of the geometry of fluid inte rfaces. (C) 2000 American Institute of Physics. [S1070-6631(00)50109-8].