Article
Thermodynamics
Ri Zhang, Yumiao Wang, Yong Liu, Jifu Yin
Summary: This study investigates the impact of droplet breakup and coalescence processes on droplet size distribution in annular flow. The influence of these processes is reflected in four factors: breakup-induced droplet birth, breakup-induced droplet death, coalescence-induced droplet birth, and coalescence-induced droplet death. These four effects collectively shape the probability density distribution of droplet size after reaching a dynamic equilibrium. A numerical procedure is developed to calculate the droplet size distribution and characteristic droplet sizes using microscopic mechanisms of droplet breakup and coalescence, and the predictions are validated against experimental data.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Engineering, Electrical & Electronic
Maosen Wang, Ying Xu, Dandan Zheng
Summary: The characteristics of droplets in annular flow are crucial for the study of heat and momentum transfer between gas and liquid phases. A novel fiber optical reflectometer (FOR) technique is developed to accurately measure droplet size and velocity in horizontal annular flow. Experimentation conducted under various conditions revealed that the entrainment of liquid droplets significantly increases with higher gas and liquid flow rates. Smaller droplets tend to have higher velocities and a wider velocity distribution, while larger droplets have narrower and lower velocity distribution. The distributions of droplet size and velocity are dependent on the gas and liquid velocities.
IEEE SENSORS JOURNAL
(2023)
Article
Mechanics
Xiaokun Zhang, Haibin Zhang, Bofeng Bai
Summary: The analysis of interactions between micro-particles and carrier gas is crucial for studying micro-particle behavior, especially in fuel spray and spray cooling. However, optical imaging techniques have limitations that challenge existing testing methods in achieving high capturing capability and a large field of view for micro-particles simultaneously. This study proposes a technique that integrates dual-view lenses and a cGAN-ResNet joint algorithm to accurately measure micro-particles in a large field of view. The results show that the proposed method outperformed traditional methods and significantly increased the field of view.
Article
Nuclear Science & Technology
Fangnian Wang, Meng Zhao
Summary: Understanding the behavior of moving droplets on inclined containment walls is crucial for evaluating condensation heat and mass transfer, aerosol wash-down by condensate flow, etc. Models describing droplet motion have been presented, and new experiments have been conducted to validate the models at different Reynolds numbers. The developed droplet velocity model and transition criterion from droplet to rivulet have been well validated at high Reynolds numbers.
NUCLEAR ENGINEERING AND DESIGN
(2021)
Article
Chemistry, Analytical
Sajad Yazdanparast, Pouya Rezai, Alidad Amirfazli
Summary: A co-flow microfluidic droplet-generation device with flexible walls was developed, allowing for the adjustment of continuous phase channel width to control droplet sizes. Two different droplet-generation regimes were observed at low dispersed phase Weber numbers. Reducing the channel width produced smaller droplets and a wider range of droplet sizes compared to current technology.
Article
Mechanics
Shi-ying Shi, Huan-qiang Sun, Li-ming Lin, Cheng-fu Zhang, Jian Zhang
Summary: The study investigates the droplet behavior in a swirl flow created by two different types of guiding vanes in a VTPS. The results show that the streamlined deflector outperforms the semi-elliptical plate, which can be explained by a modified T-model. The use of the modified T-model is recommended for optimizing the design of guiding vanes in the swirling generating stage.
JOURNAL OF HYDRODYNAMICS
(2021)
Article
Materials Science, Multidisciplinary
N. Van den Steen, Y. Gonzalez-Garcia, J. M. C. Mol, H. Terryn, Y. Van Ingelgem
Summary: A new approach is proposed to predict atmospheric corrosion considering different droplet size distributions and geometries. This method utilizes observed droplet size distributions and contact angles to predict corrosion. A finite element model is solved to obtain the current density as a function of droplet geometry, and the computed corrosion current densities are used to estimate material loss for different droplet size distributions and electrolyte configurations, revealing the extent of the impact of droplet size distribution on atmospheric corrosion.
Article
Engineering, Electrical & Electronic
Mi Wang, Dandan Zheng, Jun Dong, Jiayu Hu
Summary: A new ultrasonic attenuation theoretical model MCBL is proposed for air-droplet two-phase flow, extending the droplet size range and showing applicability and practicality through experiments.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2021)
Review
Polymer Science
Mohamad Orabi, Joe F. Lo
Summary: Hydrogel droplets are biodegradable and biocompatible materials with promising applications in tissue engineering and clinical treatments. Microfluidic techniques provide precise control over the generation of hydrogel droplets, resulting in tight distributions of particle size, shape, matrix, and mechanical properties. This review focuses on recent advances in microfluidic hydrogel droplet generation and the applications of hydrogels in cell and tissue engineering.
Article
Engineering, Chemical
Wei Du, Yingfeng Duan, Lina Wang, Dayu Liu
Summary: The liquid-liquid two-phase flow and size prediction of slug droplets in microchannels with varying orifice sizes downstream were assessed through experiments. Aqueous glycerol and mineral oil with surfactant were used as the dispersed and continuous phases, respectively. Three characteristic flow patterns were observed, and flow region changes with orifice size were documented. Universal flow pattern maps and slug droplet formation regions were established, and prediction correlations for droplet sizes were developed and validated experimentally.
Article
Engineering, Multidisciplinary
Dandan Zheng, Maosen Wang, Mi Wang, Mengxu Zhai, Wenqin Wang
Summary: This study mainly focuses on the principle of using a fiber optical reflectometer (FOR) to measure the velocity and size of falling droplets. The feasibility of the method is verified through experiments, and a method for predicting droplet diameter using a fiber probe is proposed.
Article
Engineering, Chemical
Jishen Li, Bin Zhang, Fan Miao, Hao Yang, Jianqiang Shan
Summary: This paper improves the containment spray removal models to address the low accuracy of the original models of the ISAA code. Through the introduction of new models and validation experiments, it significantly improves the calculation accuracy of the spray removal constants and better simulates the attenuation trend of suspended aerosols. This work contributes to understanding the scavenging mechanism of aerosol particles by containment spray droplets and provides an analysis method with higher simulation accuracy.
JOURNAL OF AEROSOL SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Jikun Yin, Haochen Ye, Xiaoli Xia, Lanhua Yi, Tie Wang
Summary: We present a method to achieve self-assembly of zeolitic imidazolate framework-8 (ZIF-8) particles by evaporating a mixture of methanol and water. This approach effectively mitigates the coffee ring effect, facilitates rapid particle assembly, and enhances the orientation and optical properties of the resulting superstructures.
CHEMICAL COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Jikun Yin, Haochen Ye, Xiaoli Xia, Lanhua Yi, Tie Wang
Summary: We report a strategy for the self-assembly of zeolitic imidazolate framework-8 (ZIF-8) particles induced by the evaporation of a methanol-water mixture. This strategy effectively suppresses the coffee ring effect, facilitates the rapid assembly of ZIF-8 particles, and improves the orientation and optical properties of self-assembled superstructures.
CHEMICAL COMMUNICATIONS
(2023)
Article
Thermodynamics
Yumi Uruno, Jaewon Chung, Hyojun Kim, Kihyun Lee
Summary: This study numerically simulated droplet breakup and evaporation in different attemperator design configurations, validated the simulation model, and obtained useful design insights. The simulation results showed that controlling droplet size, using a venturi-type thermal liner, and employing multiple nozzles can improve evaporation efficiency.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
