Article
Thermodynamics
Xin Zhong, Yuhui Zhang, Yu Hou, Huicheng Feng, Lidong Sun
Summary: The impact dynamics of a water-ethanol binary droplet on a surface structured with titanium dioxide nanotubes is dependent on the surface temperature and ethanol concentration, resulting in six different droplet dynamics regimes. These regimes are influenced by surface temperature and ethanol concentration, with film levitation being mitigated at higher surface temperatures or ethanol concentrations.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
Yue Ma, Huang Zhang, Qianfeng Liu
Summary: This study experimentally investigates the spreading and splashing behavior of continuous droplets impinging on a heated wall under different conditions. The spreading parameters of the droplets and the relationship between splashing parameters, droplet Weber numbers, and Jacob numbers are analyzed and mathematically fitted.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Chemistry, Physical
Xiwushan Wang, Weiyuan Yu, Mingkang Wang, Fengfeng Wang, Baolei Wu
Summary: This study investigated the diffusion behavior of tin droplets on different surfaces, revealing the mechanism of driving energy in droplet diffusion and finding that there is minimal adhesion between the stainless steel surface and tin droplets.
SURFACES AND INTERFACES
(2022)
Article
Engineering, Chemical
Weiwei Zheng, Jingcheng Xu, Liya Wang, Jialu Zhang, Wenhai Chu, Jia Liu, Lijun Lu, Chen Cai, Kaiming Peng, Xiangfeng Huang
Summary: This study successfully separated micro-/nano-paraffin in water emulsions stabilized by SDS using a electric field and superhydrophilic fibrous membranes, achieving improved flux and oil removal efficiency.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Thermodynamics
Zhaonan Meng, Peng Zhang
Summary: A numerical model is developed to study the freezing dynamics of micro-sized water droplets. The study reveals different freezing patterns for droplets with diameters of 10 and 1 μm, influenced by heat conduction and cold energy exchange. The location and number of nucleation sites have varying effects on the freezing process.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Environmental Sciences
Sergey Starinskiy, Elena Starinskaya, Nikolay Miskiv, Alexey Rodionov, Fedor Ronshin, Alexey Safonov, Ming-Kai Lei, Vladimir Terekhov
Summary: This work investigates the spreading behavior of water droplets with contact angles ranging from 0 to 160 degrees on various surfaces. Superhydrophilicity is achieved through laser treatment, followed by hydrophobization using fluoropolymer coating of different thicknesses. The chosen approach allows for surfaces with different wettability but the same morphology. The parameter t* corresponding to the time when the capillary wave reaches the droplet apex is established. It is shown that the droplet height change at earlier time moments is independent of the substrate type. Comparison with other authors' data reveals that the motion of the contact line weakly depends on the used structure if its characteristic size is less than 10 μm.
Article
Mathematics, Applied
Shuang Wu, Jie Zhang, Qi Xiao, Ming-Jiu Ni
Summary: The numerical study compares two open source solvers, Gerris and Basilisk, in simulating droplet impacting problems. Basilisk demonstrates higher computational efficiency and parallel capability compared to Gerris, especially for high Reynolds number cases. The study classifies flow patterns into three categories and highlights Basilisk's potential in solving complex three-dimensional problems efficiently.
COMPUTERS & MATHEMATICS WITH APPLICATIONS
(2021)
Article
Engineering, Environmental
Weihong Peng, Yawen Jing, Donghui Zhao, Yunchao Qi, Hongmei Cheng
Summary: This study investigates the spreading and penetration dynamics of nanosilica sol droplets on different types of rocks through experiments and numerical simulations. The results show that the porous nature and mineral composition of rocks have an influence on the spreading behavior. Two new scaling laws describing the relationship between the maximum spreading factor and the Reynolds number and Weber number are proposed based on experimental data. Parametric studies reveal the significant effects of contact angle, porosity, and roughness on the penetration behavior of the droplets.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2022)
Article
Chemistry, Multidisciplinary
Yang Liu, Hui Zhang, Yijun Zhu, Jiawei Chen, Pu Wang, Songjie Dai, Xing Li, Guangneng Dong
Summary: Inspired by the jaws of tiny insects, researchers have developed a surface with novel jaw-like microstructures as micro one-way valves, enabling self-driven unidirectional spreading of liquid. These microstructures, which are almost two-dimensional, are simple and easy to fabricate. Surfaces with such micro one-way valves exhibit remarkable rapid and long-distance water droplet spreading behaviors, with a maximum forward-backward distance ratio of about 14.5, nearly double that of previous research. The capillary attraction at the location of the jaws and the pinning effect brought by the sharp edge of the jaws are identified as the main mechanisms.
Article
Mechanics
D. J. Bouchard, M. Andredaki, A. Georgoulas, M. Marengo, S. Chandra
Summary: Experimentalists face limitations in deriving information from drop impact experiments on porous surfaces due to short timescales and the opaque nature of porous materials. Numerical simulations can provide additional information such as velocity and pressure profiles, as well as quantification of fluid volume flow rates into pores. Ethanol drops cleave at all tested conditions, while water drops only cleave at higher conditions. Numerical simulations reveal that the lower surface tension of ethanol leads to further spreading, less recoil, and less liquid above the gap, promoting cleaving.
Article
Mechanics
Rui Wang, Yan-Zhao Shi, Chun-Yu Zhang, Hang Ding
Summary: This study numerically investigates the effects of different wettabilities on the impact of a liquid drop on a no-slip rigid substrate using a diffuse interface method. The goal is to establish a universal model for the maximal spreading of the impacting drop at moderate Weber numbers. The study finds that wettability plays a crucial role in the maximal spreading and identifies a scaling law that takes into account the energy transformation. Additionally, the presence of a viscous-capillary regime is attributed to the observed kinetic energy dissipation and surface energy transformation.
Article
Chemistry, Physical
Yan Zhong, Zheyan Jin, Shuaibing Cheng, Hongyi Lin, Zhe Yang, Zhigang Yang
Summary: In this study, we conducted experiments to investigate the impacting process of a water droplet onto a water film with micro-structures on the surface. We carefully studied the effects of the droplet Weber number, the dimensionless water film thickness, and the dimensionless distance between two micro-protrusions. The results showed that the dimensionless distance between two protrusions had a minor effect on the crown top diameter evolution and the crown lifetime, and the number of secondary droplets was not consistently affected by this distance.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2023)
Article
Acoustics
Yuming Feng, Junkao Liu, Hengyu Li, Jie Deng, Yingxiang Liu
Summary: Ultrasonic-assisted metal droplet deposition (UAMDD) is a promising technology in 3D printing that can change the wetting and spreading behaviors at the droplet-substrate interface. However, the contact dynamics during deposition, particularly the physical interaction and metallurgical reaction, are not well understood, which limits the prediction and regulation of microstructures and bonding property. This study investigates the wettability of impacting metal droplets on non-wetting and wetting substrates under ultrasonic vibrations, and analyzes the spreading diameter, contact angle, and bonding strength. The results show that the wettability can be significantly increased on non-wetting substrates due to substrate extrusion and momentum transfer, while on wetting substrates, it is increased by the momentum transfer layer and capillary waves.
ULTRASONICS SONOCHEMISTRY
(2023)
Article
Chemistry, Physical
Ping Guo, Ru Zhou, Zhengkun Tian, Fu Chen, Zhouhua Wang
Summary: This study investigated the effect of oil-soluble surfactants on the spreading behavior of oil droplets over water through experiments and simulations, revealing the high-efficiency mechanism behind it.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Mechanics
Zhaoyuan Meng, Yubing Zhu, Jiguang Hao, Gengkai Hu, J. M. Floryan
Summary: This study investigates the residual diameter of a droplet impacting a cold surface at a low temperature using high-speed photography. It is found that below a certain threshold temperature, the droplet freezes near its maximum spreading diameter, creating a pancake shape. However, above the threshold temperature, the droplet retracts before freezing. The threshold temperature decreases with increasing Weber number.
Article
Engineering, Aerospace
Xiaodong Chen, Vigor Yang
CHINESE JOURNAL OF AERONAUTICS
(2019)
Article
Multidisciplinary Sciences
Chunyang Yin, Shunhao Wang, Quanzhong Ren, Xinming Shen, Xiaodong Chen, Yajun Liu, Sijin Liu
Article
Computer Science, Interdisciplinary Applications
Yanxing Wang, Xiaodong Chen, Xingjian Wang, Vigor Yang
JOURNAL OF COMPUTATIONAL PHYSICS
(2019)
Article
Mechanics
Bo Wang, Shuai Zhang, Xiaodong Chen
Article
Chemistry, Analytical
Chun-Dong Xue, Xiao-Dong Chen, Yong-Jiang Li, Guo-Qing Hu, Tun Cao, Kai-Rong Qin
Article
Mechanics
Xiaodong Chen, Vigor Yang
Article
Nuclear Science & Technology
Zhihong Guo, Xiaodong Chen, Guoqing Hu
Summary: This study utilizes recent advancements in numerical methods to realistically model the complex fluid-structure interactions during a hypothetical core destructive accident in a sodium-cooled fast reactor. The evaluation of structural deformations and plug rises demonstrates the safety features of the container design.
NUCLEAR ENGINEERING AND TECHNOLOGY
(2022)
Article
Mechanics
Menghan Pan, Juan Lu, Wentao Wang, Xiaodong Chen, Qingquan Liu, Lanjuan Li
Summary: This study uses a coupling method of computational fluid dynamics and discrete element method to numerically investigate the fluidization dynamics of an impinging-jet-driven bioreactor. It is found that the bed expansion is proportional to the inlet flow rate and inversely proportional to the microcapsule density and size. The distribution of porosity indicates overall even fluidization, except for a dead region near the bottom periphery of the bioreactor. The interaction of microcapsules plays an essential role in the variations of the dead region.
Article
Mechanics
Qin Zhou, Xinglong Shang, Xiaodong Chen, Yanyan Chen, Guoqing Hu
Summary: Aerosols generated during common human activities or medical procedures play a vital role in the transmission of SARS-CoV-2. Tear films during non-contact intraocular pressure measurements can potentially carry the virus, posing a high risk for eye care practitioners and patients. Numerical investigations reveal that eyes with excessive tears have a greater probability of generating aerosols.
Article
Materials Science, Multidisciplinary
Shuai Zhang, Bo Wang, Chenmu Xue, Xiaodong Chen
Summary: This paper presents a reusable and adjustable microfluidic device composed of glass capillaries and polydimethylsiloxane, which allows for the generation of compound microdroplets with different morphologies. The device can be used for rapid prototyping and high-throughput generation of droplets or particles.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Article
Mechanics
Zeyao Ma, Shuai Zhang, Bo Wang, Qingquan Liu, Xiaodong Chen
Summary: This article investigates the deformation of compound microdroplets transported inside a circular microchannel using numerical simulations. Two droplet morphologies (shell-core and Janus) are considered, and their behavior is analyzed in terms of flow rates, physical properties, and confinement conditions. The results show that the aspect ratio of the shell droplet in shell-core microdroplets decreases with the capillary number and droplet sizes, while sudden jumps occur when thin films form between the shell and core interfaces. Conversely, the aspect ratio of the core droplet in Janus microdroplets increases and then decreases with the flow and space confinements.
Article
Biochemical Research Methods
Jinghong Su, Xiaodong Chen, Yongzheng Zhu, Guoqing Hu
Summary: This study presents a fast numerical algorithm and machine learning techniques for analysis and design of inertial microfluidic devices, generating a database of inertial lift forces in straight microchannels and developing a machine learning assisted model to predict particle trajectories quickly and accurately.
Article
Nanoscience & Nanotechnology
Yingnan Sun, Xiaodong Chen, Yongxin Zheng, Yuhan Song, Huai-Rong Zhang, Shusheng Zhang
ACS APPLIED NANO MATERIALS
(2020)
Article
Mechanics
Bo Wang, Shuai Zhang, Xiaodong Chen