Article
Engineering, Chemical
Wenjie Lan, Pinxi Cai, Shan Jing, Shaowei Li
Summary: In the two-phase dispersion process with interphase mass transfer, the dynamic variation of interfacial tension plays a crucial role in determining flow behavior. This study introduces a novel approach to simultaneously measure the dynamic interfacial tension (DIFT) and the transient fluid concentration, which has rarely been reported previously. By utilizing a micro interface sensor, the method detects both the transient droplet concentration and DIFT during interphase mass transfer. The findings reveal that the transient concentration of the droplet significantly affects the interfacial tension, and molecular movement across the interface also contributes to its variation, a phenomenon poorly documented in earlier studies. The reliability and simplicity of the method demonstrate its potential to enhance the understanding of DIFT.
CHEMICAL ENGINEERING SCIENCE
(2023)
Review
Chemistry, Physical
Priyatanu Roy, Shihao Liu, Cari S. Dutcher
Summary: Measurements of droplet phase and interfacial tension are crucial in atmospheric aerosols and emulsion science. Recent advances in microfluidics allow for customized multiphase fluid flows in channels, enabling manipulation and observation of microscale droplets in an enclosed setting without the need for large and expensive control systems. Different physical principles at the microscale and corresponding microfluidic approaches are discussed for measuring droplet phase state, viscosity, and IFT.
ANNUAL REVIEW OF PHYSICAL CHEMISTRY, VOL 72
(2021)
Article
Thermodynamics
Shahab Mirjalili, Suhas S. Jain, Ali Mani
Summary: This article discusses the interface transfer issue in two-phase flows involving heat/mass transfer. Two models are proposed to address the challenge of the undefined interface in phase field models, and their consistency, accuracy, and convergence are validated through numerical simulations. The results suggest that the two-scalar model is more accurate than the one-scalar model in cases with large diffusivity ratios.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
Hao-Nan Wang, Nan He, Bo Jiang, Da-Wei Tang, Lin Li
Summary: This study proposes a two-dimensional vapor-fed MFC model based on mixed wettability of each porous layer, and discusses the effects of two-phase mass transfer on reactant transport, electrochemical reaction, ion conduction, and cell performance. The model provides a plausible theoretical explanation for ion conductivity in catalyst layer and transport limitations for methanol and oxygen at each electrode. The vapor-fed MFC achieves a fuel utilization of up to 56% under a peak power density of 35 mW cm-2.
ENERGY CONVERSION AND MANAGEMENT
(2023)
Article
Multidisciplinary Sciences
Younes Amini, Valiyollah Ghazanfari, Mehran Heydari, Mohammad Mahdi Shadman, A. Gh. Khamseh, Mohammad Hassan Khani, Amin Hassanvand
Summary: This study analyzed the flow behavior of liquid-liquid extraction in a serpentine microchannel. A 3D model was used for simulation and the results matched experimental data. The effects of chloroform and water flow on the model were examined. The findings showed that at low and similar flow rates of both phases, a slug flow pattern was observed. However, as the overall flow rate increased, the pattern transformed into parallel plug flow or droplet flow. A higher water flow rate with a constant organic phase flow rate led to a transition from slug flow to droplet flow or plug flow. The study provides valuable insights into two-phase flow patterns in serpentine microfluidic devices and demonstrates the applicability of CFD simulation in investigating fluid behavior.
SCIENTIFIC REPORTS
(2023)
Article
Engineering, Chemical
Xuemei Xuan, Wenjie Lan, Xinyong Xu, Shaowei Li
Summary: This study presents a novel method that can simultaneously measure the droplet size and real-time interfacial tension in a two-phase flow system. By designing a T-shaped microdevice and integrating it with the two-phase flow equipment, the pressure variation as the droplets flowed through the microdevice was used as a probe to detect these two key parameters, eliminating the need for visualization. The method was validated using monodispersed and multidispersed droplet flows in different equipment, and it was shown that both the droplet size distribution and real-time interfacial tension can be determined.
Article
Chemistry, Multidisciplinary
Fanfu Guan, Yu Qian, Peiqi Zhang, Runtong Zhang, Xumu Zhang, Jialin Wen
Summary: A novel microreactor (Flashstop reactor) combining flash chemistry and radial synthesis was designed to study the isomerization process of hydroformylation by a Rh/tetraphosphite catalyst in seconds. The initial 313 seconds showed the isomerization of 60-99% of 1-octene to 2- and 3-octenes before aldehyde formation, with two different types of isomerization reactions being observed. A monohydride complex without CO ligand was proposed to account for the ultrafast isomerization in the first 30 seconds, and the isomerization rate with this complex was calculated to be faster than the well-known H(CO)Rh(P-P) species. Experimental and DFT computational studies support this assumption, showing that the Flashstop reactor is a powerful tool for analyzing kinetics in gas-liquid biphasic reactions in seconds to minutes.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Mathematics, Applied
Mohammadreza DaqiqShirazi, Azeez A. Barzinjy, Samir M. Hamad, Rezvan Alamian, Mostafa Safdari Shadloo
Summary: This study conducted a numerical investigation on the transient characteristics of two-phase flow over circular staggered and inline micro pin fins, considering varying parameters. The results showed that increasing pin diameter hinders flow mixing near micropins, while a higher surface tension ratio promotes better flow mixing.
COMPUTERS & MATHEMATICS WITH APPLICATIONS
(2021)
Article
Nanoscience & Nanotechnology
Roberto Bernasconi, Davide Carniani, Min-Soo Kim, Salvador Pane, Luca Magagnin
Summary: This paper describes the realization of artificial water striders using an inkjet-assisted electroforming approach. The striders are propelled by externally applied magnetic fields, and they show good maneuverability at different fluid interfaces. The research is significant for the development of microdevices capable of navigating various liquid environments.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Review
Chemistry, Physical
Thao Minh Ho, Aysan Razzaghi, Arun Ramachandran, Kirsi S. Mikkonen
Summary: Emulsions play a significant role in various industries and the understanding of factors affecting their generation, such as properties of dispersed and continuous phases, system conditions, and emulsifier behavior, is crucial for their design and optimization of processing conditions.
ADVANCES IN COLLOID AND INTERFACE SCIENCE
(2022)
Article
Chemistry, Analytical
Doojin Lee, Amy Q. Shen
Summary: Droplet microfluidics provides a versatile tool for measuring interfacial tensions between immiscible fluids, with the ability to generate emulsion droplets and stretch them under controlled flow conditions in microfluidic devices. The use of quasi-static 2D and 3D models allows for accurate estimation of interfacial tension in confined and unconfined droplet cases during extensional flows, demonstrating the effectiveness of these models compared to conventional techniques.
Article
Energy & Fuels
Jun Yin, Simon Kuhn
Summary: Taylor flow in microchannels is characterized by significantly higher interfacial mass transfer rates compared to conventional reactors. Vortices observed during the droplet formation stage contribute further to interfacial mass transfer. This study quantifies the contribution of the droplet formation stage to overall mass transfer and finds that it depends solely on vortex intensity. Changing flow rate ratio and viscosity also have a significant impact on interfacial mass transfer performance. These findings are important for applications involving interfacial mass transfer in microchannels.
CHEMICAL ENGINEERING AND PROCESSING-PROCESS INTENSIFICATION
(2023)
Article
Energy & Fuels
Tong Shi, Hao Feng, Dong Liu, Ying Zhang, Qiang Li
Summary: The use of microfluidic design can optimize the gas-liquid two-phase flow behavior in water electrolysis for hydrogen production, reducing the reaction overpotential and improving efficiency and stability. This work provides a new strategy for the design of electrochemical reactors for water splitting.
Article
Engineering, Chemical
Xin Xu, Na Xu, Wei Zhang, Junwen Wang, Yao Li, Chen Yang
Summary: This paper investigates the mass transfer mechanism and relationship of gas-liquid annular flow in a microfluidic cross-junction device. The impacts of flow pattern, liquid film thickness, liquid hydraulic retention time, phase interface fluctuation, and gas flow vorticity on mass transfer property are analyzed. Fitting equations between gas and liquid velocities and mass transfer influencing factors are established. The Pareto front of gas and liquid velocity conditions for the best flow mass transfer property is obtained, showing improved mass transfer under experimental verification.
CHINESE JOURNAL OF CHEMICAL ENGINEERING
(2023)
Article
Engineering, Chemical
Yubin Wang, Chencan Du, Zifei Yan, Wuhua Duan, Jian Deng, Guangsheng Luo
Summary: This study focuses on efficient deoxygenation of water using a miniaturized annular centrifugal device (MACD). The influence of different operational variables on the deoxygenation performance was investigated, and the mechanism of fast deoxygenation and phase separation in MACD was explained. The results show that MACD has advantages of efficient deoxygenation performance, fast phase separation, and low energy consumption.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
