Article
Chemistry, Physical
Chengyao Wang, Chen Zhao, Fei Xu
Summary: This study investigates the hydrodynamics of a double emulsion droplet under shear using computational fluid dynamic simulations. The morphological features of the deformed droplet are analyzed through deformation and tilt angles, and the mechanisms causing these deformations are explored through pressure and flow analysis. It is found that the presence of the inner droplet has both enhancing and restraining effects on the outer droplet deformation, depending on various factors.
JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
(2023)
Article
Mechanics
Xiangdong Liu, Lei Li, Jingwen Yu, Guanqiu Hao, Wei Yu, Yongping Chen
Summary: A 3D mathematical model that couples the phase-field model and the electric current model is used to investigate droplet spheroidizing in an extensional flow field. The study shows that applying an electric field can counteract the hydrodynamic forces on the droplet and lead to spheroidization. The relationship between the critical electric capillary number for droplet spheroidizing and the hydrodynamic capillary number is found to be linear and is influenced by the conductivity and permittivity ratios between the droplet and continuous phase.
Article
Engineering, Chemical
Zhuang Qi, Zhiqian Sun, Ning Li, Wangqing Li, Mingze Sun, Yue Liu, Zhenbo Wang
Summary: This study explores the effect of electric field intensity on the motion and deformation of oil droplets in O/W emulsion using molecular dynamics simulation. The results show that oil droplets deform and migrate under specific electric field intensities, providing theoretical guidance for improving the purification process of oily wastewater.
CHEMICAL ENGINEERING SCIENCE
(2022)
Article
Thermodynamics
Jiawen Zhang, Takaya Sato, Takeshi Ooyama, Keiji Koumura, Takahiro Ito, Yoshiyuki Tsuji
Summary: This paper presents experimental visualization results of sessile droplets in fully developed turbulent shear flows and their movement onset. The droplets are deformed and spread in a spanwise direction under the influence of turbulent velocity fluctuation. The contact angles of the droplets change symmetrically over time and are not clearly related to droplet oscillation. The droplet oscillation frequencies are well predicted by a model based on resonant vibrations, except for the lowest mode. The motion onset can be approximated by a simple empirical relation between the Weber and Reynolds numbers.
EXPERIMENTAL THERMAL AND FLUID SCIENCE
(2023)
Article
Mechanics
Gengyao Zhao, Dingyi Pan, Lifang Zeng, Xueming Shao
Summary: The numerical study of single droplet deformation in pulsatile shear flow using dissipative particle dynamics method showed that droplet deformation behavior varies under different flow conditions. The relationship between mean deformation parameter and flow characteristics was investigated, providing insights into control strategies for droplet deformation.
JOURNAL OF NON-NEWTONIAN FLUID MECHANICS
(2021)
Article
Chemistry, Applied
Jie Hou, Hua-Neng Xu
Summary: CD-based emulsions exhibit complex instability behaviors and the dispersion states of emulsion droplets are sensitive to the evolving morphologies of interfacial microcrystals. The ejection of ICs microcrystals from droplet surfaces provides a simple method to detect droplet-droplet interactions and phase transitions in CD-based emulsions.
CARBOHYDRATE POLYMERS
(2024)
Article
Chemistry, Multidisciplinary
Kyota Kamamoto, Akihito Kiyama, Yoshiyuki Tagawa, Xuehua Zhang
Summary: The dynamics of a liquid column of ouzo emulsion under impact were investigated, revealing the presence of a traveling jet, cavitation bubbles, and oil-lubricated drops. The study has implications for applications such as inkjet printing and fast deposition of self-lubricating drops, and discusses the jet formation mechanism in relation to the existence of oil microdroplets.
Article
Engineering, Chemical
Tobias Wollborn, Patrick Giefer, Helena Kieserling, Anja M. Wagemans, Stephan Drusch, Udo Fritsching
Summary: This study utilized numerical simulations to investigate the interfacial stress distribution during droplet dispersion, revealing key mechanisms in the droplet dispersion process. Results showed higher shear stresses at the pore wall, while lower shear stresses at the liquid/liquid interface affected the droplet dispersion process.
CANADIAN JOURNAL OF CHEMICAL ENGINEERING
(2022)
Article
Chemistry, Physical
Wenchuan Liu, Zhiqian Sun, Ning Li, Zhuang Qi, Zhenbo Wang, Zengli Wang
Summary: This study investigates the shear field and binary droplet interaction regimes of water-in-oil emulsions between parallel gold plates using molecular dynamics (MD) methods. The effects of different pressures on the interactions were compared, and it was found that heptane forms adsorbed layers on the gold plates and creates a no-slip uniform shear field driven by the parallel plates. Three main binary droplet interaction regimes were identified: coalescence, temporary bridge formation, and sliding. The study provides insights into the understanding of binary droplet interactions in shear emulsions.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Review
Engineering, Environmental
Hanpeng Gao, Siyu Chang, Jiaxi Liu, Yan Liu, Zong Meng, Yunyun Song, Xi Wang, Zhiwu Han, Luquan Ren
Summary: Emulsion separation materials have advantages of high separation efficiency, reusability, self-healing, and no secondary pollution. The unique structures and droplet motion behavior of biological surfaces provide inspiration for the design of emulsion separation materials. This review highlights recent advances of bioinspired emulsion separation materials based on droplet movement, including wettability models, applications, challenges, and development trends.
CHEMICAL ENGINEERING JOURNAL
(2023)
Review
Chemistry, Multidisciplinary
Zhefei Yang, Deborah Snyder, Ashlin Sathyan, Anna Balazs, Todd Emrick
Summary: This article reviews the latest advances in smart emulsion droplets, with a focus on the applications of organic, polymer, and/or particle surfactants in inter-droplet communication, controlled delivery, autonomous motion, and tunable emulsion inversion. The authors emphasize the importance of reactive and functional surfactants and the interplay between materials science and biology.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Mechanics
Xianrong Liang, Wulei Cai, Honghui Chen, Yunfeng Zhao, Heng Wu, Mengmeng Wang, Gang Jin
Summary: The method proposed in the research generates oscillatory extensional flow using an eccentric cylinder flow, with the frequency and amplitude controlled by the angular velocity and eccentricity of the cylinders. This flow field shows promise as a rheological tool for investigating the effects of extensional flows on dispersion dynamics.
Article
Construction & Building Technology
Jian Ouyang, Yan Meng, Sohrab Zarei, Hanwen Yang
Summary: The film formation properties of asphalt emulsion under ambient temperature drying have a significant impact on the mechanical properties of cold asphalt emulsion mixture. This study focuses on the dynamic modulus and bonding ability of emulsion residue to characterize the film formation properties. A quantitative measurement, the maximum packing fraction of asphalt droplets (phi (m)), is proposed to analyze the film structure. The results indicate that the residue properties of different asphalt emulsions vary due to the different film structure formed during drying. Furthermore, the dynamic modulus and bonding ability of emulsion residue increase linearly with the phi (m) of asphalt emulsion, while phi (m) decreases as the asphalt droplet size increases. Therefore, using asphalt emulsion with smaller droplet size is recommended for higher dynamic modulus and bonding ability of emulsion residue.
INTERNATIONAL JOURNAL OF PAVEMENT ENGINEERING
(2023)
Article
Mathematics, Interdisciplinary Applications
Roozbeh Saghatchi, Murat Ozbulut, Mehmet Yildiz
Summary: The dynamics of a 2D double emulsion under the combined effects of the electric field and shear flow were studied using an incompressible smoothed particle hydrodynamics (ISPH) method. Six different systems with varying electrical properties were examined, showing that deformation is highly dependent on capillary and electrical capillary numbers as well as core to shell radius ratio. Electric force components and hydrodynamic stresses were calculated and discussed, leading to the realization that breakup can be avoided by adjusting these factors. Different breakup forms were comprehensively investigated.
COMPUTATIONAL MECHANICS
(2021)
Article
Nanoscience & Nanotechnology
Siying Lin, Lingjing Mao, Jiaxu Ying, Nicolas Berthet, Jia Zhou, Antoine Riaud
Summary: This paper presents a simple, convenient, and user-friendly method for converting single emulsions into double emulsions using vortex mixers. The authors studied the effects of vortex speed, vortex duration, and the number of vortex/flick cycles on the properties of the double emulsions. Interesting phenomena, such as droplet breakup and the production of inverted double emulsion droplets, were observed.
MICROFLUIDICS AND NANOFLUIDICS
(2022)
Article
Physics, Multidisciplinary
He Wang, Fang-Bao Tian, Xiang-Dong Liu
Summary: In this paper, a phase-field-based lattice Boltzmann model is proposed for capturing interfaces in multi-phase flows, and its accuracy and reliability are demonstrated through numerical simulations.
Article
Thermodynamics
Yongping Huang, Liping Song, Suchen Wu, Xiangdong Liu
Summary: The study focuses on improving thermal efficiency for latent heat thermal storage pools (LHTSPs) by designing a new multi-tube LHTSP with tree-shaped fins. The enthalpy-porosity approach is employed to model the charging/discharging process, while experimental validation is conducted to ensure reliability. Results show that tree-shaped fins effectively improve thermal efficiency and temperature uniformity, with inclination significantly affecting thermal charging performance and vertical arrangements reducing melting duration by 46.3%.
APPLIED THERMAL ENGINEERING
(2022)
Article
Engineering, Chemical
Bo Zhou, Xiangdong Liu, Bo Li, Yongping Chen
Summary: The study investigated the effects of additives on the diffusion process of water molecules at the fluorobenzene/water interface using molecular dynamics simulation. Additionally, 1,3-butanediol molecules were proposed to replace ions to inhibit water molecule diffusion and avoid inner surface defects of polymer shells.
CHEMICAL ENGINEERING SCIENCE
(2022)
Article
Thermodynamics
Yongping Huang, Dongcheng Cao, Dongke Sun, Xiangdong Liu
Summary: This study investigated two innovative horizontal latent heat storage (LHS) units using uniform and gradient tree-shaped fins, finding that the gradient tree-shaped fins accelerate melting and enhance heat transfer efficiency, while they are not conducive to the solidification process.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
Yongping Huang, Donglian Chen, Yi Zheng, Xiangdong Liu
Summary: In this study, an innovative shell-and-tube latent heat storage exchanger (LHSE) with sandwiched tree-channels is designed to overcome the inefficiency of thermal transport. Numerical simulations and response surface method (RSM) are used to investigate the melting performance and optimize the structure of the innovative LHSE. The results show that the innovative LHSE unit improves the melting rate and temperature uniformity compared to traditional LHSE units, and the structural parameters of the sandwiched tree-channels significantly affect the melting performance.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Mechanics
He Wang, Suchen Wu, Zilong Deng, Xiangdong Liu, Chengbin Zhang
Summary: This study numerically investigates the dewetting process of droplets in grooves and reveals the important effects of groove geometry and wettability on the process. Three dewetting regimes, namely retention, partial dewetting, and complete dewetting, are identified. Both partial dewetting and complete dewetting are effective ways to remove droplets.
Article
Physics, Applied
Ji-Xiang Wang, Wei Yu, Zhe Wu, Xiangdong Liu, Yongping Chen
Summary: This study focuses on modeling and predicting the characteristics of droplet formation in microfluidic cross-junctions using statistical learning techniques. The newly developed Deep-FM algorithm demonstrates a high prediction accuracy, contributing to advancements in microfluidic physics research and industrial applications.
APPLIED PHYSICS LETTERS
(2022)
Article
Engineering, Chemical
Bo Zhou, Jianhao Qi, Wei Wang, Binkai Xu, Xiangdong Liu, Bo Li, Yongping Chen
Summary: Short-chain alkanes are effective additives to prolong the evaporation time during the curing process of double emulsion, improving the surface finishing of microencapsulated shells. The addition of alkanes inhibits evaporation by decreasing the activity of fluorobenzene.
CHEMICAL ENGINEERING SCIENCE
(2022)
Article
Thermodynamics
Zilong Deng, Shangwen Gao, He Wang, Xiangdong Liu, Chengbin Zhang
Summary: This paper investigates the condensation behavior and heat transfer characteristics of humid air on vertical surfaces with wettability gradient. The results show that the traditional gradient surface performs better than the hydrophilic case but worse than the hydrophobic case. Therefore, a periodic gradient surface is introduced to improve the condensation heat transfer.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Engineering, Mechanical
He Wang, Suchen Wu, Hanhui Dai, Xiangdong Liu, Chengbin Zhang
Summary: In this study, a hybrid multiphase lattice Boltzmann model is used to investigate flow boiling heat transfer in a horizontal microchannel. The flow pattern transition is reproduced by varying the heat flux, and the effects of liquid mass flux, heating wall wettability, and channel confinement height on bubble dynamics and heat transfer performance are discussed. The results show that a sequence of flow patterns occurs in the microchannel with increasing heat flux, and the dominant heat transfer mechanism varies accordingly. Increasing mass flux or confinement height extends the range of high-efficiency flow patterns. A hydrophilic heating wall is preferred for better heat transfer performance in the microchannel.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART C-JOURNAL OF MECHANICAL ENGINEERING SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Shuangshuang Miao, Xiangdong Liu, Yongping Chen
Summary: This article introduces a simple strategy to construct micro-nanostructured anti-icing coating using ice crystals, which possesses photothermal, self-healing, and self-cleaning properties. The coating, covered with interconnected microscale pores replicated from ice crystals, exhibits hydrophobicity and self-cleaning ability based on the Cassie-Baxter model and can achieve in situ solar anti-/deicing with the addition of solar-to-heat conversation nanomaterials. The coating also possesses the self-healing capability to repair hydrophobicity, and the self-cleaning and self-healing abilities synergistically improve anti-/deicing performances. The coating presents great potential and broad impacts due to its inexpensive component materials, simplicity, eco-friendliness, and high energy efficiency.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Thermodynamics
Suchen Wu, Shengkai Chen, Nianhe Xiao, Jiang Sheng, Yongping Chen, Xiangdong Liu
Summary: Untraditional copper tubular pulsating heat pipes with integral inner-wall sintered powder wicks (PHPWWs) were fabricated to improve the thermal performance of traditional pulsating heat pipes with no wicks (PHPWNWs). The addition of the wicks improved nucleation boiling and thermal driving force in the evaporator, and facilitated liquid backflow. The PHPWWs can work at a horizontal orientation and have smoother fluid flow with decreasing inclination angle.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2023)
Article
Mechanics
Xianyi Jiang, Zilong Deng, Suchen Wu, Xiangdong Liu
Summary: This paper develops a two-dimensional two-phase flow and mass transfer model based on multi-relaxation time lattice Boltzmann method and finite difference method to study the effect of Marangoni convection in double emulsions under a shear flow. The results show that the slope parameter and initial solvent concentration crucially affect the mass transfer behavior and the magnitude of the Marangoni convection of double emulsions.
Article
Green & Sustainable Science & Technology
Wei Gao, Feifan Liu, Cheng Yu, Yongping Chen, Xiangdong Liu
Summary: Encapsulating phase change materials (PCMs) using microfluidic method enables the fabrication of efficient and stabilized PCMs with desired properties. This review comprehensively summarizes the recent advances in microfluidic method-based encapsulated PCMs (ME-PCMs), highlighting the technologies for fabrication of ME-PCM capsules and ME-PCM fibers, and examining their applications in thermal regulation, thermal response, and wearable electronics. Insights on future directions for large-scale applications are also provided, hoping to inspire novel and effective encapsulation methods for ME-PCMs.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2023)
Article
Multidisciplinary Sciences
Xiangdong Liu, Guanqiu Hao, Bo Li, Yongping Chen
Summary: The electrohydrodynamic deformation of droplets in a combined DC electric field and shear flow field was investigated through a visualization experiment. Detailed experimental data on both the transient and steady droplet deformation parameters and orientations were provided under different electric field and shear flow field combinations. The internal flow characteristics of the deformed droplet were also examined. The experimental results showed that the response of the droplet is faster than its deformation parameter when an electric field is combined with a shear flow. Additionally, an asymmetric vortex forms inside the deformed droplet in the combined fields.
FUNDAMENTAL RESEARCH
(2023)
