Article
Mechanics
Ling-xin Zhang, Xin-sheng Cheng, Han Tu, Qi Gao, Xue-ming Shao, Xiang-Wei Liao, Liang Zhao
Summary: The measurement of two-phase velocities in bubble flows using laser Doppler velocimetry (LDV) is investigated. The study proposes a phase discrimination method based on the significant difference in signal amplitude between large bubbles and tracers/micro bubbles. The method is tested in a complex bubble flow and verified by bubble tracking velocimetry (BTV) technology.
JOURNAL OF HYDRODYNAMICS
(2022)
Article
Optics
Yuanyang Zhao, Desheng Zhu, Yourui Tu, Lingling Pi, Hongtao Li, Lin Xu, Zhijia Hu, Yuecheng Shen, Benli Yu, Liang Lu
Summary: This study presents an all-fiber self-mixing laser Doppler velocimetry based on frequency-shifted feedback in a distributed feedback (DFB) fiber laser, utilizing fiber-coupled acousto-optic modulators to adjust the modulation intensity and frequency of the laser self-mixing effect. The results demonstrate that the proposed scheme can adapt to the non-contact measurement requirements of wide-range speed and weak feedback level in complex environments.
Article
Optics
Kevin Rainey, Steve Gilbertson, Daniel Kalb, Thomas Beery
Summary: The study developed a method called Modulation Based Ranging (MBR) for directly measuring displacement of a moving surface in dynamic or high explosive driven experiments. It effectively overcame errors associated with integrating velocity history of objects undergoing non-radial flow, and demonstrated high accuracy in measuring displacement. The MBR technique showed excellent agreement with the Photonic Doppler Velocimetry (PDV) integrated velocity measurements in the absence of non-radial flow, and accurately measured true displacement of surfaces under strong non-radial components.
Article
Optics
Tomoki Tajiri, Tomoaki Kyoden, Shunsuke Akiguchi, Tsugunobu Andoh, Tadashi Hachiga
Summary: The study combined an acousto-optic modulator with two-beam multipoint laser Doppler velocimetry to observe blood flow velocity. The shear rate in pulsatile blood flow was measured to estimate shear stress, with the blood viscosity also considered. Results showed increased blood flow velocity and peak shear stress around obstructions. The research presents a novel blood flow detection system using acousto-optic modulation and LDV with real-time state determination capabilities.
OPTICS COMMUNICATIONS
(2021)
Article
Optics
Yifan Wang, Yuhang Li, Xin Xu, Mingwang Tian, Kaiyi Zhu, Yidong Tan
Summary: A novel interferometry method based on laser feedback technique for long distance transmission is proposed, showing high sensitivity and simple structure. A compensation method is designed to reduce drift and improve displacement resolution, making it promising for practical applications in remote sensing or harsh conditions.
Article
Multidisciplinary Sciences
Alaa E. Fayed, Mohamed M. Thabet, Marwa Metwally Salama, Malak El Shazly
Summary: The purpose of this study was to compare choroidal adjusted flow index (AFI) in healthy, hypertensive, and preeclamptic pregnancies using optical coherence tomography angiography (OCTA). OCTA imaging was performed on third trimester pregnant women in each group. The results showed that preeclamptic pregnancies had the lowest AFI, followed by hypertensive pregnancies, compared to healthy pregnancies. The study found that choroidal ischemia may be responsible for hypertensive and preeclamptic retinochoroidal pathology, and choroidal blood flow on OCTA could serve as a precursor for disease progression.
Article
Physics, Multidisciplinary
N. Nissim, E. Greenberg, M. Werdiger, Y. Horowitz, L. Bakshi, Y. Ferber, B. Glam, A. Fedotov-Gefen, L. Perelmutter, S. Eliezer
Summary: The novel photonic Doppler velocimetry design aims to measure the free-surface velocity of opaque materials at high pressures, providing a solution for velocity diagnostics in laser-driven shock-wave experiments.
MATTER AND RADIATION AT EXTREMES
(2021)
Article
Environmental Sciences
Zhenshan Xu, Chiyuan Xu, Gang Wang, Jiabo Zhang, Yongping Chen
Summary: Rivers play a crucial role in transporting land-based materials to the sea, including fresh water, sediment, pollutants, and nutrients. The interaction between nearshore runoff and seawater shapes the movement characteristics of river plumes. This study investigates the river plume's patterns using particle image velocimetry (PIV) and dye tracing methods. The findings indicate that changes in flow rate and environmental water density affect the shape of the river plume in both aerial and lateral views. The Froude number can describe the combined effect of flow rate and water density on the river plume.
FRONTIERS IN MARINE SCIENCE
(2023)
Article
Multidisciplinary Sciences
Xuefang Li, Sebastien Erpicum, Emmanuel Mignot, Pierre Archambeau, Michel Pirotton, Benjamin Dewals
Summary: This paper presents two datasets obtained from laboratory experiments of urban flooding, which are valuable for validating and improving numerical or analytical models of urban flooding and may contribute to flood risk management and flood-resilient urban design.
Article
Physics, Fluids & Plasmas
A. D. Bragg, D. H. Richter, G. Wang
Summary: The study investigates the motion characteristics of particles in turbulent flow using theory and numerical simulations, revealing that the average vertical velocities and distribution of particles are influenced by various mechanisms such as turbulence effects and particle inertia. These mechanisms vary with the distance of particles from the wall, ultimately affecting the vertical velocity and concentration of particles.
PHYSICAL REVIEW FLUIDS
(2021)
Article
Engineering, Chemical
Wanquan Deng, Zhen Li, Lei Ji, Linmin Shang, Demin Liu, Xiaobing Liu
Summary: This paper investigates the velocity distribution in the draft tube of a Francis pump turbine using laser Doppler velocimetry. The study finds that the velocity pulsation is directly related to the pressure pulsation and is also influenced by the cavitation coefficient.
Article
Engineering, Chemical
Chukwunonso Chinedu Anyaoku, Sati N. Bhattacharya, Rajarathinam Parthasarathy
Summary: This study demonstrates the measurement of batch settling velocities of particles in columns using Electrical Resistance Tomography (ERT) with a high vertical spatial resolution of 1 mm. The novel methodology and analytical equations were used to test suspensions of different concentrations, yielding accurate settling velocity data.
CHEMICAL ENGINEERING SCIENCE
(2022)
Article
Environmental Sciences
Thu Ha Nguyen, Thuy-Chung Kieu-Le, Fiona H. M. Tang, Federico Maggi
Summary: This paper investigates the settling velocity of microplastic fibres in water and proposes that length, curliness, and settling orientation are key factors affecting their settling velocity. Experimental findings support the hypothesis that changing the settling orientation from horizontal to vertical can increase the settling velocity of fibres longer than 1 mm, while fibre curliness can significantly reduce the settling velocity. Fibres shorter than 1 mm mostly settle horizontally, and their settling velocity is unaffected by curliness.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Geosciences, Multidisciplinary
Tao Huang, Yue Li, Jack C. H. Cheng, Jim Haywood, K. K. Hon, David H. Y. Lam, Olivia S. M. Lee, Simone Lolli, Ewan James O'Connor, Harry F. Lee, Mengya Wang, Steve H. L. Yim
Summary: A year-long intensive observation of the atmospheric boundary layer (ABL) at multiple sites in Hong Kong using a four-Doppler Light Detection and Ranging (LiDAR) network with different scanning modes revealed the heterogeneity of the ABL induced by orographic topography, as well as the interaction between local and advected aerosol layers during a transboundary air pollution (TAP) episode.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Optics
Yourui Tu, Yuanyang Zhao, Desheng Zhu, Ruifeng Li, Keyan Liu, Lin Xu, Lei Zhang, Zhigang Cao, Benli Yu, Liang Lu
Summary: This paper introduces an all-fiber self-mixing interferometric method based on laser feedback technology, which enables high-sensitivity measurements over long transmission distances. The experiment demonstrates that the measurement distance of the sensor is not limited by the coherence length of the laser used. This technology has been successfully applied to measuring the velocity of non-cooperative targets, showing great potential for practical applications.
Article
Engineering, Chemical
Francisco J. Higuera, Juan Fernandez de la Mora
Summary: This study investigates a particle condensation device that uses cold and warm humid air streams to achieve water vapor condensation. Compared to existing water condensation particle counters, this configuration offers advantages such as variable saturation ratio, accelerated penetration of water vapor, and a relatively uniform saturation field.
JOURNAL OF AEROSOL SCIENCE
(2024)
Article
Engineering, Chemical
Brijal Prajapati, Vishal Dharaiya, Manoranjan Sahu, Chandra Venkatraman, Pratim Biswas, Kajal Yadav, Delwin Pullokaran, Ramya Sunder Raman, Ruqia Bhat, Tanveer Ahmad Najar, Arshid Jehangir
Summary: This study evaluated the performance of a low-cost particulate matter sensor and proposed a physics-based calibration method. The results showed that the physics-based calibration approach performed better compared to statistical models at both observation sites.
JOURNAL OF AEROSOL SCIENCE
(2024)
Correction
Engineering, Chemical
N. Searle, K. Kaur, K. Kelly
JOURNAL OF AEROSOL SCIENCE
(2024)
Article
Engineering, Chemical
Tianyu Cen, Laura Torrent, Andrea Testino, Christian Ludwig
Summary: In this study, a hyphenated setup consisting of a rotating disk diluter (RDD) with spICP-MS (RDDspICP-MS) was used for online sampling and characterization of metallic nanoparticles (NPs) in ambient pressure aerosols. The RDD allowed for constant flow rate sampling of aerosols and adjusting the dilution ratio for different particle number concentrations (PNCs). The feasibility of this setup was tested with different sizes of AuNPs in argon-based and air-based aerosols, and the results showed a lower limit of detection for number concentration. The capability of the setup to accurately investigate multi-modal samples and the interference of ionic species was also demonstrated.
JOURNAL OF AEROSOL SCIENCE
(2024)
Article
Engineering, Chemical
A. Valenzuela, E. Bazo, R. A. Rica, L. Alados-Arboledas, F. J. Olmo-Reyes
Summary: This article introduces a method to measure the extinction cross section of levitated particles using an electrodynamic trap and double-cavity ring down spectroscopy technique, and demonstrates the potential of this method in 1,2,6-hexanetriol particles through simulations and experiments. Unlike traditional methods, this technique provides crucial information about the extinction cross section of sodium chloride particles during dehydration and hydration processes.
JOURNAL OF AEROSOL SCIENCE
(2024)
Article
Engineering, Chemical
Shadi Yaqoubi, Mohaddese Sokuti, Sahand Mazloum-Ravasan, Kofi Asare-Addo, Hamed Hamishehkar, Ali Nokhodchi
Summary: In this study, a modified version of ultrasonic spray pyrolysis was used to prepare salbutamol sulfate dry powder. The engineered particles showed suitable characteristics for effective drug delivery to the lungs and demonstrated acceptable aerosolization performance. This newly introduced method appears to be capable of producing dry powder formulations of different drugs without the need for surfactants or stabilizers.
JOURNAL OF AEROSOL SCIENCE
(2024)
Article
Engineering, Chemical
Ashley L. Nord, Patrice Dosset, Pierre Slangen, Manouk Abkarian
Summary: Phonation has been found to be a potent transmission route for the COVID-19 virus. To control transmission, it is important to measure the amount of aerosols produced by speech. Researchers used digital in-line holography to overcome experimental challenges and successfully imaged the formation and deformation of saliva filaments in the mouth during speech, as well as the resulting aerosolized droplets.
JOURNAL OF AEROSOL SCIENCE
(2024)
Article
Engineering, Chemical
Yating Wang, Yiyang Zhang, Zhu Fang, Xinxin Wu
Summary: The research investigates the energy dissipation in particle-wall collision with roughness using the finite element method. The results show that the presence of surface roughness leads to lower viscoelastic dissipation and higher restitution coefficient compared to a smooth surface. The collision time is identified as a key factor in predicting the energy dissipation.
JOURNAL OF AEROSOL SCIENCE
(2024)
Article
Engineering, Chemical
Shaamrit Balendra, Akshay Kale, Julie Pongetti, Mohsen Kazemimanesh, Molly Haugen, Lee Weller, Adam Boies
Summary: The measurement of airborne particles is important for detecting and characterising air pollution, emissions, fire detection, occupational and climate impacts. However, current optical particle counters (OPCs) cannot measure ultrafine particles. This study explores the limitations of miniaturising a condensation particle counter (CPC) growth chamber and provides a toolkit for optimising the design of miniaturised CPC-GCs.
JOURNAL OF AEROSOL SCIENCE
(2024)
Article
Engineering, Chemical
Markus Snellman, Namsoon Eom, Maria E. Messing, Knut Deppert, Chris Hogan
Summary: Segregated bimetallic nanoparticles, such as core-shell nanoparticles, have attracted widespread interest in various fields like biomedicine, catalysis, and optoelectronics. Aerosol technology provides an optimal platform for controlling the size, structure, and composition of nanoparticles, which are crucial parameters for tuning the material performance for specific applications. In this study, researchers developed a novel evaporator design that allows on-line coating of core particles with a shell directly in the gas phase. By utilizing a local heater, the researchers were able to decouple the heating process of the evaporating material from the aerosol particles, thereby limiting core-shell alloying. The resulting core-shell particle formation with controllable shell thickness was demonstrated using evaporation of zinc onto core particles of gold, tin, and bismuth. Simple models were also discussed to explain the observed growth process inside the evaporator and the formation of the shell.
JOURNAL OF AEROSOL SCIENCE
(2024)
Article
Engineering, Chemical
Kentaro Misawa, Yuto Kasai
Summary: In this study, the laser-induced fluorescence technique was used to observe scattered and fluorescent signals from fluorescent polystyrene latex particles. The ratio of fluorescence to scattered signal intensities was found to be almost equal for particles of the same size, allowing for the separate observation of mixed-size fluorescent particles. Relative fluorescence intensities were obtained by incorporating ratios of fluorescence to scattered signal and relative scattered signal intensities.
JOURNAL OF AEROSOL SCIENCE
(2024)
Article
Engineering, Chemical
Sripriya Nannu Shankar, William B. Vass, John A. Lednicky, Tracey Logan, Rebeccah L. Messcher, Arantzazu Eiguren-Fernandez, Stavros Amanatidis, Tara Sabo-Attwood, Chang-Yu Wu
Summary: This study introduces a testing system that allows for direct exposure of aerosolized viruses onto host cells. By collecting particles of different sizes and analyzing them, researchers obtained information on the concentration and viability of the virus at different particle sizes.
JOURNAL OF AEROSOL SCIENCE
(2024)