Evidence of preferential sweeping during snow settling in atmospheric turbulence

  title={Evidence of preferential sweeping during snow settling in atmospheric turbulence},
  author={Jiaqi Li and Aliza Abraham and Michele Guala and Jiarong Hong},
  journal={Journal of Fluid Mechanics},
  • Jiaqi Li, Aliza Abraham, +1 author Jiarong Hong
  • Published 10 September 2021
  • Physics
  • Journal of Fluid Mechanics
Abstract We present a field study of snow settling dynamics based on simultaneous measurements of the atmospheric flow field and snow particle trajectories. Specifically, a super-large-scale particle image velocimetry (SLPIV) system using natural snow particles as tracers is deployed to quantify the velocity field and identify vortex structures in a 22 m $\times$ 39 m field of view centred 18 m above the ground. Simultaneously, we track individual snow particles in a 3 m $\times$ 5 m sample… Expand


Snowflakes in the atmospheric surface layer: observation of particle–turbulence dynamics
We report on optical field measurements of snow settling in atmospheric turbulence at $Re_{\unicode[STIX]{x1D706}}=940$ . It is found that the snowflakes exhibit hallmark features of inertialExpand
Measurement of atmospheric boundary layer based on super-large-scale particle image velocimetry using natural snowfall
We present an implementation of super-large-scale particle image velocimetry (SLPIV) to characterize spatially the turbulent atmospheric boundary layer using natural snowfall as flow tracers. TheExpand
Experimental study of inertial particles clustering and settling in homogeneous turbulence
We study experimentally the spatial distribution, settling and interaction of sub-Kolmogorov inertial particles with homogeneous turbulence. Utilizing a zero-mean-flow air turbulence chamber, we dropExpand
Settling velocity and concentration distribution of heavy particles in homogeneous isotropic turbulence
The average settling velocity in homogeneous turbulence of a small rigid spherical particle, subject to a Stokes drag force, has been shown to differ from that in still fluid owing to a bias from theExpand
Advances in the Estimation of Ice Particle Fall Speeds Using Laboratory and Field Measurements
Accurate estimates for the fall speed of natural hydrometeors are vital if their evolution in clouds is to be understood quantitatively. In this study, laboratory measurements of the terminalExpand
Settling velocity of small inertial particles in homogeneous isotropic turbulence from high-resolution DNS
Abstract The gravitational settling velocity of small heavy particles in a three-dimensional turbulent flow remains a controversial topic. In a homogeneous turbulence of zero mean velocity, bothExpand
Settling regimes of inertial particles in isotropic turbulence
Abstract We investigate the settling speeds and root mean square (r.m.s.) velocities of inertial particles in isotropic turbulence with gravity using experiments with water droplets in air turbulenceExpand
Near-wake behaviour of a utility-scale wind turbine
Super-large-scale particle image velocimetry (SLPIV) and the associated flow visualization technique using natural snowfall have been shown to be effective tools to probe the turbulent velocity fieldExpand
Turbulence Effects on the Settling of Suspended Particles
ABSTRACT The reducing and enhancing effects of turbulence on the settling velocities of single particles is discussed in terms of theory and the available experimental data. The coherent eddyExpand
Stochastic modeling of direct radiation transmission in particle-laden turbulent flow
Abstract Direct radiation transmission in turbulent flows laden with heavy particles plays a fundamental role in systems such as clouds and particle solar receivers. Owing to their inertia, particlesExpand