Turbulence modulation by large ellipsoidal particles: concentration effects

摘要: We use laboratory measurements to study how suspended ellipsoidal particles affect the velocity statistics of a turbulent flow. The ellipsoids have size, time, and scales corresponding inertial subrange turbulence are nearly neutrally buoyant. These characteristics make them likely candidates for two-way interactions with fluid (i.e., they influence flow influenced by it). vary volume fraction observe effects on one- two-point in phase. Measurements at two different heights indicate that particle buoyancy (0.5 % denser than ambient fluid) significantly changes fraction. see particles’ effect kinetic energy is non-monotonic function also find presence causes redistribution variance from large small within subrange, i.e., slope power spectra flatter single-phase case.