Article
Engineering, Chemical
Ning Li, Yunhui Pang, Zhiqian Sun, Yongxiang Sun, Zhuang Qi, Wangqing Li, Yue Liu, Bin Li, Zhenbo Wang, Hongbo Zeng
Summary: Polymers have a significant impact on the electrostatic demulsification efficiency of water-in-oil (W/O) emulsions by altering the motion characteristics of water droplets. The addition of polymers increases the polarity of the droplets, promoting their deformation and breakup under an electric field. The migration of polarized polymers and ions ultimately leads to droplet breakup.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Engineering, Chemical
Xin Huang, Xiaoming Luo, Yunrui Han, Weidong Li, Yuekun Lai, Lin Teng
Summary: The deformation and breakup behaviors of droplets containing polymer were investigated to understand the mechanism of electric field collapse during the treatment of emulsion containing polymer. The results showed that the electric field collapse process caused by droplet breakup consists of three steps, and the increase of polymer concentration strengthens the Joule heating effect.
Article
Mechanics
Lijuan Qian, Yeshan Wang, Zhongli Chen, Chenlin Zhu
Summary: In this study, the effect of airflow temperature on the breakup of silicone oil droplets in continuous airflow was investigated. The morphology, deformation stage, and breakup regime map were discussed in detail by varying the airflow temperature and Weber number. The results showed that the airflow temperature had a significant influence on droplet breakup modes and droplet size. The liquid bag growth time accurately described the droplet breakup characteristics.
Article
Engineering, Environmental
Hongwei Zou, Yuhang Chen, Jie Zhang, Zhiyong Tang, Qing Wu
Summary: Inspired by the bionic structure, a honeycomb network was designed and manufactured via 3D-printing based on Bejan's Constructal theory. The flow characteristics of the liquid-liquid system with a very low viscosity ratio were investigated, revealing different flow types in the honeycomb network and competition behaviors of droplet pairs in convergences.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Engineering, Chemical
Lingzhen Kong, Jiaqing Chen, Tian Lan, Huan Sun, Kuisheng Wang
Summary: This study analyzed the primary breakup process of liquid jet column, droplet size and velocity distribution, as well as the hydrodynamic characteristics of gas flow in a tubular gas-liquid atomization mixer. The results showed that the gas flow rate is the main influencing parameter for droplet size and distribution uniformity in atomization.
CHINESE JOURNAL OF CHEMICAL ENGINEERING
(2021)
Article
Engineering, Chemical
Haifeng Gong, Zhixiang Liao, Ye Peng, Zhi Qiu, Bao Yu, Youyu Zhang
Summary: The size of droplets in oil changes dynamically during demulsification, affecting the optimum demulsification electric field frequency. Constant pulsed electric field cannot meet the requirement of optimum frequency, while a variable frequency pulsed electric field can cater to the change in optimum frequency and has high demulsification ability. However, the dynamic characteristics of droplets in oil subjected to variable frequency pulsed electric field are not well understood. In this study, a chaotic pulse position modulation electric field is considered as a type of variable frequency pulsed electric field, and the dynamic and chaotic characteristics of droplet deformation in oil under this electric field are investigated.
CHEMICAL ENGINEERING SCIENCE
(2022)
Article
Mechanics
D. Dufour, F. X. Tanner, K. A. Feigl, E. J. Windhab
Summary: Experimental and simulation studies were conducted to analyze the flow characteristics of antral contraction waves in the stomach and investigate the dispersion of liquid drops. The research found that the conditions for drop breakup depend on the viscosity ratio of the liquid drops and the critical distance to the wave apex.
Article
Chemistry, Physical
Ning Li, Zhiqian Sun, Yuling Fan, Wenchuan Liu, Yinglei Guo, Bin Li, Zhenbo Wang
Summary: The study revealed that an increase in electric field strength results in larger interparticle spacings, significantly higher values of electrostatic potential and van der Waals potential, leading to increased deformation of droplets and ultimately causing droplet breakup. Through hydrogen bond and hydration analysis, it was found that different breakup patterns were influenced by hydrogen bond lifetime and ion distribution. The results demonstrate that droplet break-up is highly dependent on weak intermolecular interactions such as strong attraction.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Engineering, Chemical
Jing Zhang, Yibo Gao, Bin Gong, Yaxia Li, Jianhua Wu
Summary: The study investigates the deformation and breakup characteristics of liquid droplets in the concave-wall jet, revealing three different modes of droplet behavior. Droplet breakup mainly occurs in regions with high shear rates.
CHEMICAL ENGINEERING & TECHNOLOGY
(2021)
Article
Nanoscience & Nanotechnology
Liang Hu, Lei She, Yanshen Fang, Rui Su, Xin Fu
Summary: This article investigates the effects of driving and jet parameters on the deformation characteristics of droplets generated by Rayleigh jet breakup. Numerical solutions simulate spatial instability of jet breakup and non-linear jet breakup influences droplet oscillation amplitude.
Article
Engineering, Multidisciplinary
Kadry Zakaria, Hoda Kamel, Yasser Gamiel
Summary: The linear stability analysis of an electrified liquid sheet confined between two symmetric dielectric movable ambient gas has been conducted. The study focuses on estimating the response of planar jet systems under the application of a tangential electric field. Dispersion relations for varicose and sinuous modes have been formulated. The influence of the electrical Euler number and some flow parameters on the instability of the electrified liquid sheet has been tested. The results show that the tangential electric field has a stabilizing effect on the sinuous mode, while it slightly improves the stability of the system for the varicose mode within a certain limit, but plays a significant role in stability for higher values of the gas velocity ratio.
ALEXANDRIA ENGINEERING JOURNAL
(2022)
Article
Engineering, Chemical
Ye Tian, Hong Wang, Xin Zhou, Qiyuan Deng, Xun Zhu, Rong Chen, Yudong Ding, Qiang Liao
Summary: The study investigates the dynamic behavior of droplet impact on a solid surface in an electric field, showing that the applied electric field can significantly affect droplet stretching behavior and lead to different breakup modes. Through simulations, the relationship between impact Weber number, applied electric field, and breakup modes was obtained. This work contributes to a thorough understanding of droplet impact behavior and provides guidance for modern droplet-related engineering applications.
CHEMICAL ENGINEERING SCIENCE
(2021)
Article
Engineering, Environmental
Taoxian Zhang, Ting Shao, Yingjuan Zhang, Dawei Pan, Weixing Huang, Bo Li
Summary: The study investigates the effect of interface deformation on liquid-liquid two-phase flow in a confined microchannel, revealing two typical flow field structures inside droplets and their transition law. A universal correlation model for predicting liquid film thickness is established, based on multiple variables and dimensionless numbers.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Physical
Zhiqian Sun, Ning Li, Wangqing Li, Shuo Weng, Tianhao Liu, Zhenbo Wang
Summary: In this study, the breakup of water droplets in water-in-oil emulsions under high-voltage and high-frequency pulsed electric fields was investigated using a comprehensive approach of microscopic experiment, theoretical derivation, and molecular dynamics simulation. The research findings revealed three main modes of droplet breakup and derived critical field strengths to predict breakup locations. The formation and migration of hydrated ions played a crucial role in droplet breakup, and the energy of the electric field transformed into the deflection of dipole moment and velocity of water molecules.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Engineering, Chemical
Guanqiu Wang, Chunying Zhu, Taotao Fu, Youguang Ma
Summary: This study experimentally investigated the deformation of droplets and the formation of tail satellite droplets in microchannels, revealing that the rear cap of the droplet is more prone to deformation. The critical criterion for the formation of tail satellite droplets was proposed, showing good agreement with the experimental results.
CHEMICAL ENGINEERING SCIENCE
(2021)
Article
Mechanics
Nicolas Bouvet, Savannah S. Wessies, Eric D. Link, Stephen A. Fink
Summary: This study presents a framework to characterize firebrand flows and compare exposure through the use of a measurement device and data processing methods. The ability to perform exposure comparisons and recognize combustion states is demonstrated.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2024)
Article
Mechanics
P. Botticini, G. Lavalle, D. Picchi, P. Poesio
Summary: This study investigates the gravity-driven liquid layer problem on an inclined plate, taking into account the variable density of the fluid. The study examines the influence of density variation on the formulation of a depth-averaged model and the role of compressibility in long-wave interfacial instability.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2024)
Article
Mechanics
Jean-Paul Caltagirone
Summary: This article introduces a method for modeling capillary flows on a surface or at the interface of two fluids. The method involves handling the two components of capillary acceleration using the divergence and curl of surface normal. The proposed formulation is characterized by directional curvature based on dihedral angle, intrinsic anisotropic surface tension per unit mass, and introduction of capillary potential.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2024)
Article
Mechanics
Qi-Teng Zheng, Chun-Bai-Xue Yang, Shi-Jin Feng, Yu-Chen Song, Yong Zhao, Yu-Lin Wu
Summary: This paper proposes a new two-phase partitioning boundary model to accurately predict the drying process of a porous medium from saturated to unsaturated conditions. The model is validated through laboratory soil drying tests and the study also investigates the effects of air-water interfacial area and water retention parameters on the drying process.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2024)
Article
Mechanics
Alexandra Metallinou Log, Morten Hammer, Svend Tollak Munkejord
Summary: Flashing flow is commonly found in industrial systems and accurate flashing models are essential for the design of safe and efficient CO2 transportation systems. We propose a homogeneous flashing model that takes into account the physical phenomena of phase change. The model is fitted using CO2 pipe depressurization data and we find that the same model parameters can be applied for different cases.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2024)
Article
Mechanics
Q. Tan, S. A. Hosseini, A. Seidel-Morgenstern, D. Thevenin, H. Lorenz
Summary: The possible impact of temperature differences during crystal growth is investigated in this study. A numerical model is developed to simulate the crystallization dynamics of (S)-mandelic acid, taking into account temperature effects. The study shows that the heat generation at the crystal interface has only a small effect on the surrounding temperature field.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2024)
Article
Mechanics
Hideki Murakawa, Sana Maeda, Sven Eckert
Summary: This study investigates the behavior of bubbles in a liquid metal under the influence of a magnetic field, particularly bubble chains. The results show that increasing the magnetic field strength suppresses the oscillations of the bubbles and concentrates their crossing positions in a specific area. Applying these findings to numerical models can further optimize continuous casting processes.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2024)
Article
Mechanics
Johanna Potyka, Kathrin Schulte
Summary: This paper presents an advanced Volume of Fluid (VOF) method for performing three-dimensional Direct Numerical Simulations (DNS) of the interaction of two immiscible fluids in a gaseous environment with large topology changes. The method includes efficient reconstruction of phase boundaries near the triple line using a Piecewise Linear Interface Calculation (PLIC) method and enhanced surface force modeling with the Continuous Surface Stress (CSS) model. Implementation of these methods in the multi-phase flow solver Free Surface 3D (FS3D) yielded successful validation. The simulations provide valuable insights into the collision process and can support future modeling of immiscible liquid interaction.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2024)
Article
Mechanics
Martin Rohde, Sebastian Burgmann, Uwe Janoske
Summary: This study investigates the effect of superimposing an incident flow and two-dimensional vibration on the critical air flow velocity required for the detachment of a droplet. The results show that oscillatory excitation at specific frequencies can significantly reduce the critical velocity for droplet detachment.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2024)
Article
Mechanics
Tea-Woo Kim, Baehyun Min
Summary: Liquid-gas two-phase slug flow is a complex flow pattern in energy systems, and accurately predicting slug liquid holdup is crucial for system design and operation. Existing HLLS models have limited applicability due to a lack of physical basis. This study proposes a new dimensionless number SP and correlates it with HLLS data, resulting in a unified HLLS correlation that agrees closely with experimental data.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2024)
Article
Mechanics
Christian Lieber, Stephan Autenrieth, Kai-Yannic Schoenewolf, Amy Lebanoff, Rainer Koch, Sterling Smith, Paul Schlinger, Hans-Joerg Bauer
Summary: The observation of acoustically levitated droplets offers great potential for studying their evaporation characteristics. The main objective of this study is to present an experimental setup that minimizes the disturbing effects of the levitation technique in order to investigate convective heat and mass transfer during droplet evaporation.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2024)
Article
Mechanics
Facundo Cabrera-Booman, Nicolas Plihon, Mickael Bourgoin
Summary: The settling behavior of individual spheres in a quiescent fluid was experimentally studied. The mean trajectory angle with the vertical showed complex behavior as the parameters Gamma and Ga varied. The transition from planar to non-planar trajectories and the emergence of semi-helical trajectories were observed, especially for denser spheres.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2024)
Article
Mechanics
Hongbin Wang, Hanwen Luo, Jinbiao Xiong
Summary: This article introduces an iterative screening method for closure models in nucleate boiling flow simulation, and demonstrates its accuracy through experiments.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2024)
Article
Mechanics
Alexandra Metallinou Log, Morten Hammer, Han Deng, Anders Austegard, Armin Hafner, Svend Tollak Munkejord
Summary: This study investigates the rapid depressurization of liquid CO2 and compares the predictions of different models. It is found that higher temperatures result in shorter relaxation times.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2024)
Article
Mechanics
Rizwan Zahoor, Sasa Bajt, Bozidar Sarler
Summary: This numerical study evaluates the jet characteristics of non-Newtonian power-law fluids in a gas dynamic virtual nozzle. The results show that shear-thinning fluids result in thicker, longer, and slower jets compared to shear-thickening fluids. Additionally, a dripping-jetting phase diagram of the nozzle is obtained by varying the power law index, gas, and liquid flow rates.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2024)