Article
Physics, Multidisciplinary
G. C. Antunes, P. Malgaretti, J. Harting, S. Dietrich
Summary: Both numerical and analytical analysis have shown that a chemically patterned active pore can function as a micro- or nanopump for fluids, even if it is symmetric. This is due to a spontaneous symmetry breaking caused by the dominance of advection over diffusion in solute transport. It has been further demonstrated that a combination of geometrical and chemical inhomogeneities is required for pumping and controlling the flow rate. Under certain parameter values, the flow becomes unsteady and exhibits persistent oscillations with tunable frequency. Additionally, the flow generates convection rolls and promotes mixing in the low Reynolds number regime.
PHYSICAL REVIEW LETTERS
(2022)
Article
Biochemical Research Methods
Tianjin Yang, Karin J. Buholzer, Andrea Sottini, Xiaobao Cao, Andrew Demello, Daniel Nettels, Benjamin Schuler
Summary: Probing non-equilibrium dynamics with single-molecule spectroscopy is important for understanding biomolecular mechanisms. Existing microfluidic mixing systems are not suitable for surface-adhesive biomolecules, but droplet-based microfluidic mixing overcomes these limitations.
Article
Biochemistry & Molecular Biology
Chia-Ying Lee, Tsuimin Tsai, Po-Chun Peng, Chin-Tin Chen
Summary: In this study, doxorubicin-loaded lipid-based nanocarriers were developed using microfluidic technology based on electrostatic interaction. The nanocarriers showed high loading capacity and efficient drug release in an acidic environment. Different lipid compositions were optimized to achieve preferred drug release in acidic environments, leading to improved therapeutic efficacy compared to PEGylated liposomal doxorubicin in vivo.
Article
Thermodynamics
Junsheng Wang, Qiaoyu Feng, Junzhu Yao, Kai Zhao
Summary: A novel T-type electromagnetic micromixer was proposed by combining the effects of laminar flow with Lorentz force. The effects of various parameters on the fluid mixing in the micromixer were numerically investigated, and the mixing efficiency achieved as high as approximately 97% by adjusting these parameters.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Engineering, Chemical
Fang Yang, Wei Zhao, Guiren Wang
Summary: Electrokinetic (EK) micromixers have been widely studied, but they usually require different electrical conductivity between the fluids to be mixed. This study presents a method to enhance mixing between fluids with identical conductivity using an EK micromixer with conductive sidewalls. The results show that the mixing becomes stronger with increased conductivity value. This method provides a novel and convenient strategy for mixing fluids with the same or similar electrical conductivity in microfluidic systems.
CHINESE JOURNAL OF CHEMICAL ENGINEERING
(2022)
Article
Chemistry, Multidisciplinary
Sehee Yang, Young Geon Kim, Sanghyuk Park, Shin-Hyun Kim
Summary: Researchers have developed photonic microcapsules with dual or triple stopbands, offering a wider range of colors and optical codes. By manipulating interparticle interactions, they were able to control the size and composition of crystalline grains in the microcapsules, resulting in controllable mixed structural colors and reflectance spectra.
ADVANCED MATERIALS
(2023)
Article
Energy & Fuels
Xiang Cao, Bo Zhou, Cheng Yu, Xiangdong Liu
Summary: In this study, a three-dimensional unsteady model was developed to investigate droplet-based mixing in bumpy serpentine microchannels with different bump structures. The results revealed that centrifugal component immersion and component entrainment by nonuniform vortices are the main factors promoting mixing in these microchannels. Additionally, the outside bumps enhance mixing efficiency by increasing centrifugal component immersion and reducing pressure drop.
CHEMICAL ENGINEERING AND PROCESSING-PROCESS INTENSIFICATION
(2021)
Article
Mechanics
Zhaomiao Liu, Kai Shi, Fanming Cai, Yanlin Ren
Summary: In this paper, the ternary dilute solute lattice Boltzmann model is used to study the mixing processes and mechanisms of solutes inside Janus droplets. The results show that there is a main circulation and a dead zone inside the droplet, and the mixing efficiency is affected by factors such as droplet velocity, tilt angle, and volume ratio. This study provides theoretical support for further improvement of droplet micro-mixer efficiency.
Article
Chemistry, Multidisciplinary
Sehee Yang, Young Geon Kim, Sanghyuk Park, Shin-Hyun Kim
Summary: The researchers created photonic microcapsules with dual or triple stopbands, offering a wider range of colors through structural color mixing. They controlled the crystallization of colloidal mixtures using depletion forces and specific conditions, resulting in different particles and controlled ratios within the crystals.
ADVANCED MATERIALS
(2023)
Article
Crystallography
Margot Van Nerom, Pierre Gelin, Mehrnaz Hashemiesfahan, Wim De Malsche, James F. Lutsko, Dominique Maes, Quentin Galand
Summary: In this study, we investigated the various experimental conditions and their influence on the polymorphism of 5-methyl-2-[(2-nitrophenyl)amino]-3-thiophenecarbonitrile (ROY). We found that different ROY concentrations and solvent to antisolvent ratios favored different polymorphs, and different mixing methods also led to the formation of different polymorphs. A customized microfluidic setup was developed to accurately control all parameters and demonstrated the importance of parameters other than concentration on the polymorphism of ROY.
Article
Energy & Fuels
Rana Altay, Abuzer Alp Yetisgin, Kaan Erdem, Ali Kosar
Summary: This study evaluates the mixing performance of five-loop spiral polydimethylsiloxane micromixers with spiral structures and elliptical structures. The elliptical spiral microchannels were able to provide high mixing indices up to 98% at a Reynolds number of 20, showing passive control over mixing performance at various locations along the microchannel.
CHEMICAL ENGINEERING AND PROCESSING-PROCESS INTENSIFICATION
(2021)
Article
Engineering, Environmental
Xiaotian Shen, Tiechuan Li, Zhaoxun Wang, Xianwu Ke, Sihong Shen, Haipeng Cui, Yang Yang, Wenlan Guo, Chen Sun, Xuexin Duan
Summary: A novel system was developed in this study to rapidly mix droplets using stereo micro-vortices induced by gigahertz bulk acoustic waves. Two mixing modes, omni-edge mixing mode and uni-edge mixing mode, were identified through investigating the energy transfer process of acoustic waves and the distribution of acoustic streaming, enabling controlled manipulation of droplets of various volumes.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Erfan Ghazimirsaeed, Masoud Madadelahi, Mahdi Dizani, Amir Shamloo
Summary: This study investigates chemical reactions and mixing phenomena in droplet-based bioreactors using numerical simulation, exploring the impact of different cross-sectional geometries on the rates of chemical species. The results show that the reaction initiates from the front section of the droplet.
Article
Engineering, Chemical
Fahizan Mahmud, Khairul Fikri Tamrin, Shahrol Mohamaddan, Nobuo Watanabe
Summary: This study simplifies the manufacturing process and improves mixing performance by externally applying ultrasound and thermal energy upstream of the micromixer. The Dean micromixer shows higher mixing performance compared to T- and Y-micromixers, with about 27% improvement for Reynolds numbers between 40 and 100.
Article
Chemistry, Analytical
Jihyeong Lee, Saebom Lee, Minki Lee, Ritesh Prakash, Hyejeong Kim, Gyoujin Cho, Jinkee Lee
Summary: In this study, the effects of Coriolis and Euler forces on the mixing performance during the acceleration and deceleration of a rotating disk in the mixing chamber were investigated numerically and experimentally. The study found that increasing the rotational velocity and period improves the mixing performance, and a substantial difference between Euler forces at different radii enhances the mixing performance.
Article
Automation & Control Systems
Yao Gong, Young-Jin Baik, Chang Ping Li, Chan Byon, Jang Min Park, Tae Jo Ko
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2017)
Article
Thermodynamics
Young-Jin Baik, Ich-Long Ngo, Jang Min Park, Chan Byon
JOURNAL OF HEAT TRANSFER-TRANSACTIONS OF THE ASME
(2016)
Article
Mathematics, Applied
Jang Min Park
APPLIED MATHEMATICS AND COMPUTATION
(2018)
Article
Engineering, Chemical
Van Thanh Hoang, Jiseok Lim, Chan Byon, Jang Min Park
CHEMICAL ENGINEERING SCIENCE
(2018)
Article
Engineering, Mechanical
Yue Wu, Yao Gong, Kyoung Je Cha, Jang Min Park
JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY
(2019)
Article
Engineering, Chemical
Van Thanh Hoang, Jang Min Park
CHEMICAL ENGINEERING SCIENCE
(2019)
Article
Automation & Control Systems
Yao Gong, Kyoung Je Cha, Jang Min Park
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2020)
Article
Mechanics
Jang Min Park
JOURNAL OF NON-NEWTONIAN FLUID MECHANICS
(2020)
Editorial Material
Engineering, Geological
Van Thanh Hoang, Wankun Liu, Jang Min Park
Summary: This study clarifies the conflict between the theoretical analyses of radial flow of a Bingham fluid by Zou et al. and Dai and Bird, attributing it to the different treatment of gap-wise mass flux. While Zou et al. presume it to be negligible, Dai and Bird's model does not require this assumption, leading to the origin of the conflict. It is concluded that both models should be seen as separate entities deriving from distinct perspectives.
JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING
(2021)
Article
Physics, Fluids & Plasmas
Wankun Liu, Jang Min Park
Summary: In this study, a numerical model and analysis were used to investigate the interaction between two equal-sized immiscible droplets in a confined shear flow. Three different types of interactions were identified: reverse motion, pass-over motion, and rotary Janus motion after wetting. The study also provided more details about the droplet trajectory and deformation during the rotary Janus motion, and investigated the effects of initial droplet position, capillary number, and confinement.
PHYSICAL REVIEW FLUIDS
(2022)
Article
Nuclear Science & Technology
Jang Min Park, Kukhee Lim
Summary: This study investigates the impact of two- and three-dimensional finite element models on the failure of the lower head of a reactor pressure vessel (RPV). The findings suggest that the three-dimensional effect is significant for determining the failure location, while the non-uniformity of thickness distribution and thermal load also have a notable influence on failure assessment. The thermal load, in particular, has the most significant effect on failure location.
NUCLEAR ENGINEERING AND TECHNOLOGY
(2022)
Article
Engineering, Chemical
Wankun Liu, Jang Min Park
Summary: This study investigates the engulfing behavior between two equal-sized immiscible droplets suspended in a confined shear flow. The effect of shear rate, surface tension, and confinement on the engulfing behavior is systematically examined using finite element analysis with a ternary diffuse-interface model and the Stokes equation. The results show that when the shear rate is low, partial and complete engulfing result in Janus and compound droplets, respectively. The partial engulfing regime is significantly affected by the shear rate, and the proper condition for Janus formation becomes narrower as the shear rate increases. It is also found that the shell of a compound droplet can be broken by increasing the initial separation or confinement.
CHEMICAL ENGINEERING SCIENCE
(2023)
Article
Mechanics
Jang Min Park, Kukhee Lim
Summary: We present asymptotic and numerical solutions for the axisymmetric diverging radial flow of a viscoplastic Bingham fluid in narrow gaps of varying thickness. The asymptotic solution by Muravleva (2017) is compared with the finite element analysis result to clarify recent confusion discussed by Zou et al. (2021) and related articles. The impact of variable gap thickness on the local kinematics of the diverging radial flow, particularly in the pseudo-plug region, is also discussed.
JOURNAL OF NON-NEWTONIAN FLUID MECHANICS
(2023)
Article
Mechanics
Van Thanh Hoang, Van Duong Le, Jang Min Park, Bich -Tram Truong-Le
Summary: This study investigates droplet dynamics in contraction microchannels using three-dimensional simulation and theoretical modeling. The results identify three regimes of droplet dynamics: trap, squeeze, and breakup. The effects of capillary number, entry angle, and contraction channel ratio are explored. A theoretical model is proposed to describe the transition between squeeze and trap regimes, dependent on the entry angle. The findings provide valuable recommendations for designing contraction microchannels.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2023)
Article
Engineering, Mechanical
Wankun Liu, Woojin Kim, Jang Min Park
TRANSACTIONS OF THE KOREAN SOCIETY OF MECHANICAL ENGINEERS A
(2018)
