92 citations · 469 across the 40 of their papers we have counts for
40 papers
Numerical Investigation of Airborne Infection Risk in an Elevator Cabin under Different Ventilation Designs
Ata Nazari, Changchang Wang, Ruichen He +2
Airborne transmission of SARS-CoV-2 via virus-laden aerosols in enclosed spaces poses a significant concern. Elevators, commonly utilized enclosed spaces in modern tall buildings,…
Atmospheric aerosol diagnostics with UAV-based holographic imaging and computer vision
Nathaniel R. Bristow, Nikolas Pardoe, Jiarong Hong
Emissions of particulate matter into the atmosphere are essential to characterize, in terms of properties such as particle size, morphology, and composition, to better understand i…
In situ Biological Particle Analyzer based on Digital Inline Holography
Delaney Sanborn, Ruichen He, Lei Feng +1
Obtaining in situ measurements of biological microparticles is crucial for both scientific research and numerous industrial applications (e.g., early detection of harmful algal blo…
Numerical investigation of airborne transmission in low-ceiling rooms under displacement ventilation
Changchang Wang, Jiarong Hong
This study employs computational fluid dynamics (CFD) simulations to evaluate the risk of airborne transmission of COVID-19 in low-ceiling rooms, such as elevator cabins, under mec…
Stochastic particle advection velocimetry (SPAV): theory, simulations, and proof-of-concept experiments
Ke Zhou, Jiaqi Li, Jiarong Hong +1
Particle tracking velocimetry (PTV) is widely used to measure time-resolved, three-dimensional velocity and pressure fields in fluid dynamics research. Inaccurate localization and…
Imaging-based 3D Particle Tracking System for Field Characterization of Particle Dynamics in Atmospheric Flows
Nathaniel Bristow, Jiaqi Li, Peter Hartford +2
A particle tracking velocimetry apparatus is presented that is capable of measuring three-dimensional particle trajectories across large volumes, of the order of several meters, du…
Snow particle analyzer for simultaneous measurements of snow density and morphology
Jiaqi Li, Michele Guala, Jiarong Hong
The detailed characterization of snow particles is critical for understanding the snow settling behavior and modeling the ground snow accumulation for various applications such as…
Direct measurement of vorticity using tracer particles with internal markers
Jiaqi Li, Lei Feng, Chinmayee Panigrahi +1
Current experiment techniques for vorticity measurement suffer from limited spatial and temporal resolution to resolve the small-scale eddy dynamics in turbulence. In this study, w…
Wind Farm Icing Loss Forecast Pertinent to Winter Extremes
Linyue Gao, Teja Dasari, Jiarong Hong
The 2021 Texas power crisis has highlighted the vulnerability of the power system under wind extremes, particularly with the increasing penetration of energy resources that depend…
Probing into gas leakage characteristics of ventilated supercavity through bubbly wake measurement
Siyao Shao, Jiaqi Li, Kyungduck Yoon +1
The stability of ventilated supercavitation is strongly influenced by gas leakage characteristics of the cavity. Here we conduct a systematic investigation of such characteristics…
Characterization of atmospheric coherent structures and their impact on a utility-scale wind turbine
Aliza Abraham, Jiarong Hong
Atmospheric turbulent velocity fluctuations are known to increase wind turbine structural loading and accelerate wake recovery, but the impact of vortical coherent structures in th…
Data-driven yaw misalignment correction for utility-scale wind turbines
Linyue Gao, Jiarong Hong
In recent years, wind turbine yaw misalignment that tends to degrade the turbine power production and impact the blade fatigue loads raises more attention along with the rapid deve…
Evidence of preferential sweeping during snow settling in atmospheric turbulence
Jiaqi Li, Aliza Abraham, Michele Guala +1
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-scal…
Insights into ventilation hysteresis shift due to flow unsteadiness in ventilated supercavitation
Kyungduck Yoon, Jiaqi Li, Siyao Shao +2
Understanding ventilation strategy of a supercavity is important for designing high-speed underwater vehicles wherein an artificial gas pocket is created behind a flow separation d…
Spatially-Resolved Characterization of Oil-in-Water Emulsion Sprays
Cheng Li, Ruichen He, Zilong He +4
This study concerns the effects of pressure, spatial location, and application of oil emulsions on the resulting droplet size, eccentricity, as well as velocity distributions, all…
3D flow motions in the viscous sublayer
Santosh Kumar Sankar, Xinyi Huang, Xiang Yang +1
We employ novel digital Fresnel reflection holography to capture the 3D flows within the viscous sublayer of a smooth-wall turbulent channel flow at Reτ=400. The measurements revea…
Settling and Clustering of Snow Particles in Atmospheric Turbulence
Cheng Li, Kaeul Lim, Tim Berk +5
The effect of turbulence on snow precipitation is not incorporated into present weather forecasting models. Here we show evidence that turbulence is in fact a key influence on both…
Operational-dependent wind turbine wake impact on surface momentum flux revealed by snow-powered flow imaging
Aliza Abraham, Jiarong Hong
As wind energy continues to expand, increased interaction between wind farms and their surroundings can be expected. Using natural snowfall to visualize the air flow in the wake of…
Mechanisms of dynamic near-wake modulation of a utility-scale wind turbine
Aliza Abraham, Luis A. Martinez-Tossas, Jiarong Hong
The current study uses large eddy simulations to investigate the transient response of a utility-scale wind turbine wake to dynamic changes in atmospheric and operational condition…
Evaluation of laser diffraction-based particle size measurements using digital inline holography
Santosh Kumar. S, Zilong He, Christopher Hogan +2
The measurements of size distribution of small particles (e.g. dusts, droplets, bubbles, etc.) are critical for a broad range of applications in environmental science, public healt…
Machine learning shadowgraph for particle size and shape characterization
Jiaqi Li, Siyao Shao, Jiarong Hong
Conventional image processing for particle shadow image is usually time-consuming and suffers degraded image segmentation when dealing with the images consisting of complex-shaped…
Effects of Inflow Turbulence on Structural Deformation of Wind Turbine Blades
Linyue Gao, Shu Yang, Aliza Abraham +1
The present investigation provides the first field characterization of the influence of turbulent inflow on the blade structural response of a utility-scale wind turbine (2.5MW), u…
Machine learning holography for measuring 3D particle size distribution
Siyao Shao, Kevin Mallery, Jiarong Hong
Particle size measurement based on digital holography with conventional algorithms are usually time-consuming and susceptible to noises associated with hologram quality and particl…
Internal flows of ventilated partial cavitation
Kyungduck Yoon, Shijie Qin, Siyao Shao +1
Our study provides the first experimental investigation of the internal flows of ventilated partial cavitation (VPC) formed by air injection behind a backward-facing step. The expe…