Article
Optics
Vassily Kornienko, David Andersson, Mehdi Stiti, Jonas Ravelid, Simon Ek, Andreas Ehn, Edouard Berrocal, Elias Kristensson
Summary: In this paper, the authors propose a novel solution to the problem of time and spatial resolution in monitoring fast transient events. By combining multiplexed imaging with high-speed sensor technology, they are able to capture high-quality image series at two simultaneous time scales, enabling the tracking of rapidly evolving structures and the extraction of acceleration fields.
PHOTONICS RESEARCH
(2022)
Article
Nanoscience & Nanotechnology
Monica Sanchez-Barquilla, Francisco J. Garcia-Vidal, Antonio Fernandez-Dominguez, Johannes Feist
Summary: This article presents a method that allows a quantized description of the full electromagnetic field through a small number of discrete modes, addressing the challenging task of theoretical description for complex nanostructures. The low computational demand of this method makes it suitable for studying dynamics for a wide range of parameters.
Article
Thermodynamics
Qisi Wang, Zhentao Wang, Yimin Jiang, Shiqi Yang
Summary: The study investigated the electro-spraying of liquid from capillaries under high electric voltage, capturing the characteristics and changes in droplets under different modes. Experimental findings showed a close relationship between droplet size, shape, and dispersion with applied potential and flow rate.
EXPERIMENTAL AND COMPUTATIONAL MULTIPHASE FLOW
(2021)
Article
Mechanics
Andrea Palumbo, Onofrio Semeraro, Jean-Christophe Robinet, Luigi de Luca
Summary: The effect of low-speed circular synthetic jets (SJ) on the turbulent transition of a laminar boundary layer is investigated through direct numerical simulations in this study. It is found that SJ can promote transition and generate hairpin-like vortices. The effect of free-stream turbulence (FST) on the vortical structures generated by SJ is also analyzed. The study provides valuable information for the practical implementation of low-speed SJ actuators as active turbulators.
Article
Physics, Applied
Bo Zhao, Jiahui Wang, Zhexin Zhao, Cheng Guo, Zongfu Yu, Shanhui Fan
Summary: This study investigates a new type of nonreciprocal thermal emitters that can simultaneously couple to multiple diffraction channels, breaking the symmetry relation between absorptivity and emissivity in previous diffraction emitters and significantly broadening the angular range of the nonreciprocal effect. These multichannel emitters can function as one-way energy splitters, expanding the flexibility of thermal-radiation control in nonreciprocal thermal-emitter design.
PHYSICAL REVIEW APPLIED
(2021)
Article
Optics
Jumei Shang, Huajiang Chen, Zhan Sui, Qijing Lin, Kaiwen Luo, Lingyun Yu, Wentao Qiu, Heyuan Guan, Zhe Chen, Huihui Lu
Summary: In this paper, an electro-optic on-chip beam shifting device is proposed, which is based on gradient microstructured electrodes and an optical tapered waveguide fabricated using lithium niobate. The refractive index distribution of the optical waveguide can be electrically defined and adjusted by the designed gradient microstructured electrodes, enabling directed beam propagation and shifting. The demonstrated beam shifting device exhibits high electro-optic tunability and fast response time, making it suitable for applications in optical switching, beam scanning and ranging, optical spatial communications, etc.
Article
Multidisciplinary Sciences
Minhyup Song, Minje Song, Seungyoung Lim, Hyunjong Choi, Taehyun Lee, Gyudong Choi, Youngjin Jung, Joon Tae Ahn
Summary: This study presents flat-topped coherent supercontinuum lasers with tunable repetition rates and programmable spectral bandwidths. By merging nonlinearly broadened electro-optic optical frequency combs with optical line-by-line spectrum shaping, supercontinuum sources with ultra-broadband and high-repetition-rate coverage can be achieved. The spectral bandwidth programming is implemented by iterative spectrum shaping and input power control, while the repetition rate tuning is performed by modulation speed control. The coherence of the supercontinuum during tuning and programming is analyzed using a phase-noise analysis method.
SCIENTIFIC REPORTS
(2022)
Article
Optics
Weigang Zhao, Hui Chen, Xiaotian Fu, Fusheng Qiu, Xiaoyong Wei, Zhuo Xu
Summary: An innovative method for measuring the electro-optic coefficient with high precision and repeatability was proposed in this study. The signed EOCs of a congruent LiNbO3 crystal were determined, contributing to the development of potential anisotropic devices of optical crystals. This research may have implications for the field of optical crystal anisotropy.
Article
Computer Science, Information Systems
Abhishek Sharma, Sushank Chaudhary, Jyoteesh Malhotra, Muhammad Saadi, Sattam Al Otaibi, Lunchakorn Wuttisittikulkij
Summary: Recent reports from WHO highlight the impact of human negligence on road accidents and casualties worldwide. This has led to an increased focus on intelligent transportation system (ITS) by researchers. This study focuses on designing a sensor system that can detect and range multiple targets under adverse atmospheric conditions.
CMC-COMPUTERS MATERIALS & CONTINUA
(2022)
Article
Optics
Denghui Song, Ke Yin, Runlin Miao, Chenxi Zhang, Zhongjie Xu, Tian Jiang
Summary: This paper investigates the characteristics of dispersion-managed, polarization-maintaining 1-GHz mode-locked fiber lasers both experimentally and numerically. Three compact and robust 1-GHz fiber lasers operating at different dispersion regimes were demonstrated. The net dispersion of the cavity is adjusted by changing the types of PM erbium-doped fibers and SESAMs. The long-term stability of the lasers is proved without external control.
Article
Optics
Weicheng Dai, Long Jin, Chang Liu, Yuan Dong, Guangyong Jin
Summary: This article introduces a MOPA system with single longitudinal mode and high repetition frequency, using two 444 nm laser diodes for end-pumping a Pr3+:YLF active medium. The Pr3+:YLF MOPA laser system generates an output with a pulse width of 130.2 ns, a maximum pulse energy of 13.5 mu J, and a peak power of approximately 103.7W at a pulse repetition frequency of 20 kHz. The laser system emits at a wavelength of 639.7 nm, with a laser spectra line-width of about 168 MHz. Despite the amplification, the laser beam quality does not decrease significantly at the highest output level.
Article
Optics
D. E. N. G. H. U. Song, K. E. Yin, R. U. N. L. I. N. Miao, C. H. E. N. X. Zhang, Z. H. O. N. G. J. I. E. Xu, T. I. A. N. Jiang
Summary: In this paper, the characteristics of dispersion-managed, polarization-maintaining (PM) 1-GHz mode-locked fiber lasers were investigated both experimentally and numerically. Three compact and robust 1-GHz fiber lasers operating at different dispersion regimes were demonstrated. The long-term stability of the lasers without external control was also proved. A numerical model was constructed to analyze the mode-locking dynamics, and pulse evolution simulations were carried out, showing agreement with experimental results.
Article
Agronomy
Changxi Liu, Jun Hu, Yufei Li, Shengxue Zhao, Qingda Li, Wei Zhang, Mingming Zhao
Summary: The study investigates the movement characteristics of electrostatic droplets from a UAV induction conical electrostatic nozzle using a combination of numerical simulation and high-speed photography. The analysis shows that the charging voltage, droplet falling distance, and airflow velocity are the main factors affecting the settlement of electrostatic droplets.
Article
Optics
Seth Holladay, Zhili Zhang
Summary: The use of linear array focused laser differential interferometry (LA-FLDI) has proliferated due to its ability to collect data from multiple measurement positions simultaneously. High-speed cameras offer an alternative to photodiode arrays, providing easy alignment and expanded ability for larger arrays of FLDI points. The experiments show that while the magnitudes of individual pixel spectra may be smaller than that of photodiodes, the camera results imply the potential for informative estimates of spectral content from arrays of arbitrary sizes and shapes.
OPTICS COMMUNICATIONS
(2023)
Article
Engineering, Mechanical
Tomaz Bregar, Klemen Zaletelj, Gregor Cepon, Janko Slavic, Miha Boltezar
Summary: This paper introduces a novel methodology for an improved experimental estimation of full-field FRFs using a dynamic substructuring approach, by forming a hybrid model from two different experimental models of the same system through System Equivalent Model Mixing. The hybrid model demonstrates increased accuracy in estimating FRFs, especially in the high-frequency range, compared to existing methods.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2021)
Article
Thermodynamics
Jue Wang, Zhentao Wang, Sirong He, Bin Li, Junfeng Wang
Summary: In this study, a saturated pool boiling experiment and numerical simulation were conducted to investigate the relationship between dry spots and critical heat flux (CHF) in the boiling of pure water and Rhodamine B (RB) solution. The results showed that RB solution has a lower onset of nucleate boiling (ONB) and a higher CHF than pure water. Additionally, the size of dry spots in RB solution was only about 15.4% of that in pure water, and the optimal concentration of RB solution for the wetting of the heating surface was 2000 ppm. It was also found that the solutal Marangoni effect in RB solution inhibits the evaporation of the micro-layer and increases the liquid distribution on the heating surface.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2023)
Article
Engineering, Chemical
Jiang Li, Jiawei Ma, Goodarz Ahmadi, Jingliang Dong, Wei Yang, Jiyuan Tu, Lin Tian
Summary: Lateral migration plays a significant role in fiber deposition in wall-bounded flows. This study systematically examines the transport and deposition of non-neutrally buoyant ellipsoidal fibers in low Reynolds number flows, and identifies shear-induced lift and rotation as the major driving force for fiber deposition.
JOURNAL OF AEROSOL SCIENCE
(2023)
Review
Mechanics
Wei Zhang, Junfeng Wang, Zhentao Wang, Bin Li, Kai Yu, Shuiqing Zhan, Yuanping Huo, Hai Wang, Haojie Xu
Summary: This article introduces the concept of charged multiphase flow and analyzes the bubble dynamics on charged liquid-gas flow objects, including the important dynamic behaviors during bubble generation, motion, and interaction. It also expands the traditional gas-liquid-solid three-phase flow system into a broader range of multiphase flow systems involving plasma, enriching the theoretical and frontier scientific problems of multiphase flow.
Article
Chemistry, Physical
Kai Yu, Liuhao Chen, Weifeng Zhang, Huagui Zhang, Jianguang Jia, Zhentao Wang, Bin Li, Wei Zhang, Haojie Xu, Lei Zuo, Junfeng Wang, Jianming Pan, David Harbottle
Summary: The dynamics of polymer-coated silica composite nanoparticles (CPs) during bubble coarsening are primarily influenced by the behavior of the polymer layer, while in-situ particle aggregation leads to accelerated bubble coalescence.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Article
Chemistry, Physical
Yunchao Li, Zhentao Wang, Bin Li, Mingdong Ju, Kai Yu
Summary: Electrohydrodynamic (EHD) atomization is a physical process where a liquid is disintegrated into monodisperse fine drops under the influence of an external electric field and pumped through a capillary tube. This study used molecular dynamics (MD) methods to numerically investigate the EHD atomization behaviors under various operating parameters. The effects of electric potential, liquid flowrate, sodium chloride concentration, and temperature on the atomization process were systematically examined and analyzed. The findings provide a microscopic insight into EHD atomization and have the potential to optimize operating parameters and improve efficiency.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Mechanics
Shuiqing Zhan, Rui Yuan, Xiaohan Wang, Wei Zhang, Kai Yu, Bin Li, Zhentao Wang, Junfeng Wang
Summary: The growth and detachment dynamics of a single hydrogen bubble on microelectrode surfaces in water electrolysis were investigated using numerical simulation, force balance analysis, and experimental data. Multiple simulation cases with different bubble diameters were conducted to study the unsteady growth and detachment behavior. A force balance model was developed to predict bubble detachment diameter using simulated physical parameters and experimental results. The models were validated with previous experimental data and were found to accurately predict bubble detachment diameter.
Article
Computer Science, Interdisciplinary Applications
Zhiwei Shen, Jingliang Dong, Liam Milton-McGurk, Xinyu Cai, Hanieh Gholizadeh, Hak-Kim Chan, Ann Lee, Agisilaos Kourmatzis, Shaokoon Cheng
Summary: Understanding the effects of anatomical structures on nasal flow and particle deposition is important for drug delivery optimization and assessing the impact of pollutants and toxins inhalation. This study found that simplifying the geometry of the nasal cavity had minimal effect on airflow but influenced the location and quantity of particle deposition.
COMPUTER METHODS AND PROGRAMS IN BIOMEDICINE
(2023)
Article
Biology
Jiang Li, Jiawei Ma, Jingliang Dong, Wei Yang, Jiyuan Tu, Lin Tian
Summary: This study utilized a realistic respiratory airway model to investigate the transport and deposition of fibers in the respiratory system. It found that the upstream airway geometry and flow condition have a significant impact on fiber transport and deposition in the downstream airway regions.
COMPUTERS IN BIOLOGY AND MEDICINE
(2023)
Article
Thermodynamics
Mingdong Ju, Bin Li, Wei Xiang, Zhentao Wang, Junfeng Wang
Summary: The electro-deformation and breakup dynamics of nanoparticle-laden droplets under electric fields were investigated using molecular dynamics simulations. It was found that SiO2 nanoparticles can stabilize the droplets and improve their stability. The droplet stability is higher under alternating current fields compared to direct current fields, and increasing the AC frequency enhances stability. These findings are valuable for optimizing the design of compact and efficient oil-water separators.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Thermodynamics
Yunchao Li, Zhentao Wang, Bin Li, Jiameng Tian, Kai Yu
Summary: Electrospray in the cone-jet regime can produce highly charged and fine monodisperse drops, further disintegrating into nanoscale drops and ions. The jet and its breakup instability are significantly affected by liquid properties and the addition of surfactants. This study focuses on the atomization of ethanol containing surfactants in the cone-jet to investigate the synergistic effect of surfactant types, concentrations, and surfactant-salt on jet evolution behaviors. The results show that different surfactants have varying effects on jet length and dispersion, and the addition of surfactants and salt ions can transform the atomization morphology of ethanol. The conclusions of this study can contribute to the optimization of physical parameters in electrospray.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Biology
Xinyu Cai, Jingliang Dong, Liam Milton-McGurk, Ann Lee, Zhiwei Shen, Hak-Kim Chan, Agisilaos Kourmatzis, Shaokoon Cheng
Summary: The study uses computational fluid dynamics to investigate the impact of inhaler resistance on particle deposition characteristics in an anatomically realistic human oropharynx and USP throat models. Results show that higher inhaler resistance leads to significant changes in flow dynamics in the oropharynx, affecting particle deposition beyond the oral cavity, which is not observed in the USP throat model. The study suggests that the complex interaction between inhaler resistance and pharynx geometry influences local pressure, velocity variation, and kinetic energy profiles in the airway.
COMPUTERS IN BIOLOGY AND MEDICINE
(2023)
Article
Biology
Ya Zhang, Zhenzhen Hu, Yusheng Wang, Miao Lou, Ruiping Ma, Minjie Gong, Jingliang Dong, Guoxi Zheng, Botao Wang
Summary: This study investigates the transport and deposition characteristics of inhaled nanoparticles in pediatric nasal airways with adenoid hypertrophy (AH), focusing on the olfactory region. Virtual nanoparticle inhalation studies were conducted on anatomically accurate child nasal airway models using computational fluid-particle dynamics (CFPD) method. The results show that nasopharyngeal obstruction leads to uneven airflow distribution and concentration of deposited nanoparticles in specific regions. The deposition efficiency in the olfactory region decreases with increasing nanoparticle size during inhalation. After adenoidectomy, ventilation and particle deposition in the olfactory region are significantly improved. Inhalation rate and exhalation process have a significant impact on nanoparticle deposition in the olfactory region.
COMPUTERS IN BIOLOGY AND MEDICINE
(2023)
Article
Chemistry, Physical
Muhammad Naveed Khan, Shafiq Ahmad, Haifaa F. Alrihieli, Zhentao Wang, Mostafa A. Hussien, Mohammad Afikuzzaman
Summary: The key focus of this study is to explore the flow and heat transfer characteristics of blood-based composite nanoparticles consisting of Al2O3, SiC, and MWCNT. The study found that these nanomaterials have high thermal conductivity attributes and enhance heat transfer in fluids. The study also considers the impact of velocity partial slip and thermal convective conditions. Numerical calculations are performed to obtain a detailed description of the nanoparticles and unary nanoparticles under different parameters. The results show a significant reduction in fluid velocity and slip parameter for nanofluids in the presence of the Darcy-Forchheimer model.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
