Turbulence decay behind expanded metal screens

An experiment study of the turbulent flow behind expanded metal screens has been carried out in a low-turbulence wind tunnel using an X-probe hot-wire anemometer system. The expanded metal screens turn flow due to a complex a rray of vaned elements. The flow turning was found to vary accordingly with the dimensions of the strands that make up the screen. The turbulence gene rated by the screens decays at a rate proportional to the downstream distan ce to the power - 5/7, consistent with studies in the literature of convent ional screens types, and was found to scale with the thickness of the scree n strands. The mean velocity, pressure drop and turbulence characteristics of expanded metal screens are presented.