Snowflakes are falling4/4/2024 ![]() I will present laboratory and field experiments demonstrating how turbulence may lead to multifold increase of fall speed of heavy particles in air. Previous numerical investigations identified several mechanisms which may alter particle settling rate as compared to the still-fluid terminal velocity, but different studies often show large qualitative discrepancies. This is of critical importance in meteorology, where an accurate knowledge of the fall speed of hydrometeors, from rain drops to snowflakes, is a necessary prerequisite for reliable precipitation forecasting. The question of how the presence and structure of turbulence affect the particle settling process remains, however, unanswered. The fall speed of heavy particles suspended in a turbulent flow is an important parameter in the modeling of numerous natural phenomena and industrial applications. ![]()
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