Related references
Note: Only part of the references are listed.
Article
Optics
Lei Wang et al.
Summary: This study investigates and tracks dispersed kerosene droplets in a swirl spray combustion field through experimental methods. Pulsed high-speed digital off-axis holography is used to visualize and quantify the droplet size, position, and velocity. A particle tracking algorithm is proposed and applied to obtain droplet trajectory. From the Lagrangian viewpoint, droplet momentum and size oscillation are observed.
OPTICS AND LASERS IN ENGINEERING
(2023)
Article
Physics, Multidisciplinary
Javier Tello Marmolejo et al.
Summary: When light scatters off a sphere, it creates a complex Mie spectrum with overlapping resonances. While single resonances can be explained using a quantum analogy and result in Fano profiles, the overall spectrum lacks recognizable patterns and is only understood through numerical simulations. In this study, we demonstrate the directional Mie spectrum of evaporating water droplets arranged in consecutive Fano Combs, and provide a comprehensive explanation by expanding the quantum analogy to treat the droplets as optical atoms with angular momentum, tunneling, and excited states.
PHYSICAL REVIEW LETTERS
(2023)
Article
Mechanics
Vasco Duke-Walker et al.
Summary: Shock-driven multiphase mixing is a common phenomenon in various physical systems. In this study, experiments are conducted to investigate simultaneous droplet-scale phenomena under extreme conditions. The results indicate that the breakup of small droplets at high Weber numbers is likely dominated by the Rayleigh-Taylor mechanism.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2023)
Article
Optics
Xinhao Wang et al.
Summary: This study explores the use of secondary rainbow refractometry for measuring refractive index and size of transparent spherical droplets in sprays. The method shows better sensitivity and accuracy compared to traditional methods, and has been successfully applied to measure monodispersed droplets in isothermal conditions. The results demonstrate the feasibility and high precision of secondary rainbow refractometry in measuring droplet size and refractive index at room temperature.
OPTICS AND LASERS IN ENGINEERING
(2022)
Article
Engineering, Chemical
Gang Zhou et al.
Summary: This study experimentally investigated the droplet breakup and droplet particles diffusion of X-swirl nozzles and revealed the impact of turbulence on the atomization process. The experimental results showed that turbulence can change the trajectory of droplets and have a significant effect on droplet breakup.
CHEMICAL ENGINEERING SCIENCE
(2022)
Article
Engineering, Multidisciplinary
Y. Wu et al.
Summary: Determining the time-resolved 3D-3C velocity is crucial for studying complex turbulent flows. This study extends a recently developed TS 3D-PTV technique for two-view imaging systems, and introduces two improvements to enhance accuracy at high particle image densities. Synthetic particle tests demonstrate the improved algorithm achieves a correctness increase of 4.7%-5.8% at 0.03 ppp. Comparative experiments confirm that the new algorithm outperforms others, providing longer and more reliable trajectories with reduced tracking interruptions caused by particle overlapping. These newly developed algorithms enhance the performance of the TS 3D-PTV system under high seeding density conditions, making it adaptable to various experimental scenarios.
MEASUREMENT SCIENCE AND TECHNOLOGY
(2022)
Article
Optics
Xiaolei Zhang et al.
Summary: Our paper proposes a particle field positioning method based on EfficientNet convolutional neural network and depth-from-defocus method. By classifying the defocus based on characteristics, combined with the lateral positions obtained by traditional methods, the proposed method can determine the 3D position of each particle. Experimental results show that our approach successfully measures the particle field and is suitable for 3D tracking of planktons. Additionally, simulative data generated by a cycle generative adversarial network reduces the workload of training data collection. The high efficiency of the proposed method demonstrates its potential application in various fields.
OPTICS AND LASERS IN ENGINEERING
(2022)
Article
Mechanics
Zhibo Wang et al.
Summary: This paper proposes a deep learning-based method to recover sharp images and infer depth information from defocused blur droplet images. The method consists of a defocus map estimation subnetwork and a defocus deblur subnetwork, optimized with a two-stage strategy. The results demonstrate satisfactory performance in depth location estimation and droplet size measurement, with good generalization and robustness.
Article
Engineering, Mechanical
Julia Lobera et al.
Summary: The three velocity components in a fluid plane can be measured using Digital Image Plane Holography. However, this technique is limited by the laser coherence length. In this study, an improved Optical Path Length Enlarging Device was introduced to measure the velocity in a 2D field four times larger than the laser coherence length, and the issues related to laser coherence and wavelength changes were addressed. The Optical Path Length Enlarging Device and Particle Image Velocimetry were applied to measure the velocity field in the central plane of a cylindrical cavity, showing good agreement with numerical simulations.
EXPERIMENTS IN FLUIDS
(2022)
Article
Mechanics
H. Hessenkemper et al.
Summary: This paper presents an automated and reliable processing method for bubbly flow images. It utilizes Convolutional Neural Networks (CNNs) to identify individual bubbles and tests various methods to handle different image conditions and bubble characteristics. Synthetic images are used to validate the capabilities and limitations of the approach, and the generated data, code, and trained models are provided for research purposes.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2022)
Article
Mechanics
Zhibo Wang et al.
Summary: This paper proposes a deep learning-based method called focus-droplet generative adversarial network (FocGAN) for automatic detection and characterization of focused droplets in shadow images. The proposed method addresses the challenges of noise and background illumination in experimental data by using a generative adversarial network framework and inception blocks for multi-scale feature extraction. The results show that FocGAN outperforms traditional methods in terms of detection accuracy and robustness to noise.
Article
Engineering, Multidisciplinary
Massimiliano Rossi et al.
Summary: The increasing use of microfluidics in industrial, biomedical, and clinical applications requires more precise control of microfluidic flows and suspended particles or cells, leading to higher demands in three-dimensional and automated particle tracking methods. General defocusing particle tracking (GDPT) is a versatile approach suitable for different types of images, with fast and segmentation-free features, suitable for automated and real-time applications.
MEASUREMENT SCIENCE AND TECHNOLOGY
(2021)
Article
Engineering, Chemical
Rafael F. L. Cerqueira et al.
Summary: This study proposes a CNN-based method for the shape reconstruction of bubbles in bubbly flows, using anchor points and boxes for bubble identification and shape reconstruction from high-speed camera images. Experimental results demonstrate the method’s generalization capability and accuracy in different gas-liquid systems, showing the effectiveness of the deep learning approach for bubble detection in high-speed camera images even in dense bubbly flow configurations.
CHEMICAL ENGINEERING SCIENCE
(2021)
Article
Engineering, Electrical & Electronic
Yu-Qi Liu et al.
Summary: This study proposes a more accurate method for describing out-of-focus blur, modeling the blur kernel using a generalized Gaussian (GG) function and simplifying it to a single-parameter model. Experimental results demonstrate the advantages of this method in image deblurring.
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS FOR VIDEO TECHNOLOGY
(2021)
Article
Mechanics
G. Bracho et al.
Summary: The study compares two optical techniques and an interferometry method for measuring droplet size and velocity, using water at different injection pressures to determine the limits and advantages of each technique.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2021)
Article
Mechanics
David Breitenmoser et al.
Summary: The study investigated droplet size distributions in an industrial self-priming Venturi scrubber with liquid film injection, revealing a shift in droplet size with gas flow rate but no change with submergence level. Comparisons with spray injection correlations showed significant overestimation, while correlations developed for annular flows in straight tubes had better consistency with experimental data.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2021)
Article
Engineering, Multidisciplinary
Rune Barnkob et al.
Summary: Defocus particle tracking (DPT) is increasingly important for determining particle trajectories in three dimensions with a single-camera system. Current methods include MF methods and CC methods, with potential for neural network methods to play a significant future role. MF methods work well in low-concentration cases, while CC methods are more robust in cases of larger particle concentration and overlap, with NN methods showing potential for development despite lower performance in comparison.
MEASUREMENT SCIENCE AND TECHNOLOGY
(2021)
Article
Meteorology & Atmospheric Sciences
Inken Knop et al.
Summary: The development of a spray system in the Braunschweig Icing Wind Tunnel for generating, transporting, and characterizing supercooled droplets has been successfully tested and calibrated. Various instruments were compared to validate the accuracy and consistency of data under different test conditions, providing reliable liquid cloud conditions for icing tests in the wind tunnel.
ATMOSPHERIC MEASUREMENT TECHNIQUES
(2021)
Article
Engineering, Multidisciplinary
Massimiliano Rossi
MEASUREMENT SCIENCE AND TECHNOLOGY
(2020)
Article
Engineering, Electrical & Electronic
Na Han et al.
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS FOR VIDEO TECHNOLOGY
(2020)
Article
Engineering, Multidisciplinary
Joerg Koenig et al.
MEASUREMENT SCIENCE AND TECHNOLOGY
(2020)
Article
Engineering, Multidisciplinary
Zhou Wu et al.
MEASUREMENT SCIENCE AND TECHNOLOGY
(2020)
Article
Engineering, Chemical
Tim Haas et al.
CHEMICAL ENGINEERING SCIENCE
(2020)
Article
Engineering, Mechanical
Rune Barnkob et al.
EXPERIMENTS IN FLUIDS
(2020)
Article
Engineering, Multidisciplinary
Bihai Sun et al.
MEASUREMENT SCIENCE AND TECHNOLOGY
(2020)
Article
Thermodynamics
Y. Wu et al.
INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW
(2020)
Article
Engineering, Chemical
Yingchun Wu et al.
Article
Thermodynamics
Longfei Chen et al.
Article
Engineering, Mechanical
Jan Menser et al.
EXPERIMENTS IN FLUIDS
(2018)
Article
Energy & Fuels
M. Ghiji et al.
Article
Mechanics
J. Steimes et al.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2017)
Article
Energy & Fuels
Lucio Postrioti et al.
Article
Multidisciplinary Sciences
G. E. Hinton et al.
