92 citations · 469 across the 40 of their papers we have counts for
26 papers · 1 filter
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,…
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…
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…
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…
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…
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…
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…
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…
Holographic Astigmatic Particle Tracking Velocimetry
Zhou Zhou, Santosh Kumar Sankar, Kevin Mallery +2
The formation of twin images in digital inline holography (DIH) prevents the placement of the focal plane in the center of a sample volume for DIH-based particle tracking velocimet…
Snow-powered Research on Utility-scale Wind Turbine Flows
Jiarong Hong, Aliza Abraham
This paper provides a review of the general experimental methodology of snow-powered flow visualization and super-large-scale particle imaging velocimetry (SLPIV), the correspondin…
Investigation of the near-wake behaviour of a utility-scale wind turbine
Aliza Abraham, Teja Dasari, Jiarong Hong
Super-large-scale particle image velocimetry and flow visualization with natural snowfall is used to collect and analyze multiple datasets in the near wake of a 2.5 MW wind turbine…
Investigation on the Atmospheric Incoming Flow of a Utility-Scale Wind Turbine using Super-large-scale Particle Image Velocimetry
Cheng Li, Aliza Abraham, Biao Li +1
The atmospheric incoming flow of a wind turbine is intimately connected to its power production as well as its structural stability. Here we present an incoming flow measurement of…
Numerical study of the behaviors of ventilated supercavities in a periodic gust flow
Renfang Huang, Siyao Shao, Roger E A Arndt +2
We conducted a numerical simulation of ventilated supercavitation from a forward-facing cavitator in unsteady flows generated by a gust generator under different gust angles of att…
Dynamic wake modulation induced by utility-scale wind turbine operation
Aliza Abraham, Jiarong Hong
Understanding wind turbine wake mixing and recovery is critical for improving the power generation and structural stability of downwind turbines in a wind farm. In the field, where…
Effect of turbine nacelle and tower on the near wake of a utility-scale wind turbine
Aliza Abraham, Teja Dasari, Jiarong Hong
Super-large-scale particle image velocimetry (SLPIV) using natural snowfall is used to investigate the influence of nacelle and tower generated flow structures on the near-wake of…
Effect of mounting strut and cavitator shape on the ventilation demand for ventilated supercavitation
Siyao Shao, Arun Balakrishna, Kyungduck Yoon +3
The present work reports behaviors regarding the formation and collapse of a ventilated supercavity while varying the cavitator shapes, including triangle, disk, and cone and varyi…