Review
Thermodynamics
Somnath Santra, Shubhadeep Mandal, Suman Chakraborty
Summary: The phase-field method is an important tool for numerical modeling of multiphase and multicomponent flows, replacing sharp interfaces with diffuse transition layers to capture interface dynamics accurately. This method provides numerical convenience and thermodynamic rigor, offering a new perspective for modeling moving boundary problems accurately.
INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW
(2021)
Article
Mechanics
Giridar Vishwanathan, Gabriel Juarez
Summary: Oscillatory flows have the potential to overcome limitations of using steady flows for inertial focusing due to low particle Reynolds numbers. Unsteady inertial forces on inertial focusing have not been thoroughly examined. Experimental and theoretical studies show that oscillatory flows are remarkably efficient for inertial focusing, even at low particle Reynolds numbers.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Mechanics
Ebrahim Ghahramani, H. Strom, R. E. Bensow
Summary: Cavitating flows involve vapour structures with various length scales, highlighting the importance of accurately estimating small-scale cavities. A hybrid cavitation model that combines a mixture model with a Lagrangian bubble model has been developed to capture multi-scale dynamics and interactions between vapour structures and the continuous flow. This approach shows considerable improvements in predicting large cavities and capturing small-scale structures, even with lower mesh resolution.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Mechanics
Aditya Madabhushi, Krishnan Mahesh
Summary: We propose a compressible multi-scale model that captures the dynamics of both large vapour cavities and micro-bubbles and takes into account the compressibility of the medium. The model tracks the homogeneous mixture of liquid and resolved vapour in an Eulerian sense and tracks the unresolved vapour in a Lagrangian sense using a novel equation. The model has been validated and shown to accurately capture the collapse of single and multiple bubbles, as well as the interaction between bubbles in a cluster.
JOURNAL OF FLUID MECHANICS
(2023)
Article
Mechanics
Vikash Pandey, Dhrubaditya Mitra, Prasad Perlekar
Summary: A direct numerical simulation study of buoyancy-driven bubbly flows in the presence of large-scale driving that generates turbulence reveals that increasing turbulence intensity leads to more curved bubble trajectories and decreased average rise velocity. The energy spectrum of the flow exhibits pseudo-turbulence scaling for small length scales and Kolmogorov scaling for larger scales. A scale-by-scale energy budget analysis helps understand the scaling behavior seen in the spectrum, with statistical properties consistent with experiments on turbulence modulation by air bubbles in water despite the weak buoyancy of the bubbles.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Mechanics
Xiang Li, Zhi-Qiang Dong, Peng Yu, Lian-Ping Wang, Xiao-Dong Niu, Hiroshi Yamaguchi, De-Cai Li
Summary: In this study, the magnetic field induced self-assembly processes of magnetic microparticles and nonmagnetic microparticles were experimentally investigated, revealing enhanced fluorescence in the inverse magnetic fluid and weakened fluorescence in the pure magnetic fluid. The advantages of the inverse magnetic fluid include low cost, no scattering effect, stable fluorescence intensity, and relatively low magnetic resistance.
Article
Chemistry, Applied
Boxin Deng, Karin Schroen, Jolet de Ruiter
Summary: During foaming, bubble formation and stability are influenced by emulsifier adsorption. A microfluidic device is used to study bubble formation and coalescence dynamics, as well as bubble properties, which can indicate emulsifier adsorption. The study shows that the concentration of sodium dodecyl sulfate (SDS) affects bubble formation time and size, with different effects at low and high pressures. In addition, different emulsifiers show varying efficiency in suppressing bubble coalescence. Understanding and manipulating emulsifier adsorption is crucial for explaining foam product properties.
FOOD HYDROCOLLOIDS
(2023)
Article
Mechanics
M. Kalli, P. Pico, L. Chagot, L. Kahouadji, S. Shin, J. Chergui, D. Juric, O. K. Matar, P. Angeli
Summary: The effect of surfactants on flow characteristics during rapid drop formation in a microchannel was investigated using various techniques. Results showed strong circulation patterns in the forming drop in the absence of surfactants, which decreased with increasing surfactant concentration. The study also observed the surfactant concentration profiles at different stages of drop formation and the impact of Marangoni stresses on the velocity profile inside the drop.
JOURNAL OF FLUID MECHANICS
(2023)
Article
Chemistry, Multidisciplinary
Wei Zhan, Ziwei Liu, Shaokun Jiang, Chunying Zhu, Youguang Ma, Taotao Fu
Summary: In this study, the generation processes of bubbles and droplets in a step-emulsification microfluidic device are compared to show the similarities and differences in the emulsification process. By changing the placement of the microdevice, the effects of buoyancy and gravity on the generation of bubbles and droplets are introduced, and the feedback mechanism of the bubble layer and the effect of droplet accumulation on the emulsification process are clarified.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2022)
Article
Mechanics
Y. Mezui, M. Obligado, A. Cartellier
Summary: This study revisits the hydrodynamics of bubble columns in the heterogeneous regime. By conducting experiments and analyzing data, the self-organization phenomenon in the heterogeneous regime and the applicability of velocity scaling under different conditions are confirmed. Furthermore, the importance of velocity scaling for coalescing media is discussed.
JOURNAL OF FLUID MECHANICS
(2022)
Article
Engineering, Chemical
Kumar Gaurav, Gaurav Mittal, Ashish Karn
Summary: Bubbly flow, a complex multiphase phenomenon, has been widely observed in various industrial applications. This paper presents experimental research on the morphology and dynamics of bubbles, as well as the effects of operating parameters. The study finds that the bubble geometry can be predicted using non-dimensional numbers, and this prediction is related to the height of the fluid above the orifice. Additionally, the study quantifies the relationship between other parameters, such as Reynolds number and Eotvos number, in bubbly flow.
CHEMICAL ENGINEERING SCIENCE
(2022)
Article
Chemistry, Multidisciplinary
Zhiwei Zhang, Zhongdong Wang, Fengrui Bao, Mengyu Fan, Shaokun Jiang, Chunying Zhu, Youguang Ma, Taotao Fu
Summary: This study investigates the bubble generation in a step-emulsification microdevice using a two-angle photography method, and establishes a model for predicting bubble size. It is found that the bubble generation mechanism is controlled by different factors depending on the capillary number, and the dynamic contact angle and hydrodynamic feedback play important roles in bubble formation.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2021)
Review
Mechanics
Alberto Aliseda, Theodore J. Heindel
Summary: The use of X-ray flow visualization has provided a powerful tool for studying multiphase flows by probing the spatial concentration of different phases without image artifacts or reduced signal-to-noise ratio. With the advancement of X-ray imaging technology, research into the three-dimensional structure of complex multiphase flows has become possible. This novel imaging technique has shed light on previously unstudied multiphase flows of industrial and environmental interest, allowing for better understanding of their internal structure and multiphase coupling.
ANNUAL REVIEW OF FLUID MECHANICS, VOL 53
(2021)
Article
Engineering, Chemical
Chen Li, Yongli Ma, Mingyan Liu, Kaiyue Wang
Summary: In this study, PIV was used to investigate the flow fields in gas-liquid mini-bubble columns. It was found that the increase of superficial liquid velocity could change the trajectory and size of bubbles, and the terminal velocity of bubbles was influenced by bubble buoyancy and flow resistance, slightly increasing with bubble coalescence.
Article
Chemistry, Physical
Boxin Deng, Karin Schroen, Jolet de Ruiter
Summary: Dynamic adsorption effects play a crucial role in bubble formation and stabilization, with bubble size depending on the interplay between time scales for bubble formation and protein adsorption. Experimental findings show two distinct bubble formation regimes, separated by a pressure difference of 1400 mbar, with different behaviors observed below and above this threshold.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2021)
Article
Chemistry, Analytical
Maria F. Mora, Carlos D. Garcia, Federico Schaumburg, Pablo A. Kler, Claudio L. A. Berli, Michinao Hashimoto, Emanuel Carrilho
ANALYTICAL CHEMISTRY
(2019)
Article
Nanoscience & Nanotechnology
Kento Yamagishi, Akihiro Nojiri, Eiji Iwase, Michinao Hashimoto
ACS APPLIED MATERIALS & INTERFACES
(2019)
Article
Materials Science, Multidisciplinary
Terry Ching, Yi-Chin Toh, Michinao Hashimoto
ADVANCED ENGINEERING MATERIALS
(2020)
Article
Nanoscience & Nanotechnology
Rahul Karyappa, Terry Ching, Michinao Hashimoto
ACS APPLIED MATERIALS & INTERFACES
(2020)
Article
Biochemical Research Methods
Azusa Shimizu, Wei Huang Goh, Shun Itai, Rahul Karyappa, Michinao Hashimoto, Hiroaki Onoe
Article
Chemistry, Analytical
Sindhu Vijayan, Pravien Parthiban, Michinao Hashimoto
Summary: PolyJet (TM) 3D printers are commonly used for fabricating microfluidic molds, but the printed microstructures exhibit deviations in both lateral and vertical dimensions. The spreading of resin leads to larger width than designed, affecting the reproduction of intended heights in narrow-designed microstructures. Mathematical models developed in this study can accurately predict the dimensional deviations and may be useful for designing and fabricating microstructures using PolyJet printers.
Article
Chemistry, Analytical
James S. Ng, Michinao Hashimoto
Summary: This paper introduces a method of utilizing FDM printing to fabricate paper-based analytical devices with three-dimensional features, using two types of thermoplastics to overcome limitations related to organic solvents in traditional PADs. The study validated the capability and potential applications of 3D-PADs in holding increased amounts of liquid samples and demonstrated colorimetric assays for organic solvent-based reactions.
Article
Engineering, Biomedical
Justin Jia Yao Tan, Cheng Pau Lee, Michinao Hashimoto
INTERNATIONAL JOURNAL OF BIOPRINTING
(2020)
Article
Chemistry, Multidisciplinary
Cheng Pau Lee, Rahul Karyappa, Michinao Hashimoto
Article
Chemistry, Multidisciplinary
James S. Ng, Michinao Hashimoto
Article
Biochemical Research Methods
Azusa Shimizu, Wei Huang Goh, Shun Itai, Michinao Hashimoto, Shigenori Miura, Hiroaki Onoe
Proceedings Paper
Engineering, Electrical & Electronic
Azusa Shimizu, Wei Huang Goh, Michinao Hashimoto, Shigenori Miura, Hiroaki Onoe
2019 20TH INTERNATIONAL CONFERENCE ON SOLID-STATE SENSORS, ACTUATORS AND MICROSYSTEMS & EUROSENSORS XXXIII (TRANSDUCERS & EUROSENSORS XXXIII)
(2019)
Proceedings Paper
Engineering, Electrical & Electronic
Akihiro Nojiri, Eiji Iwase, Michinao Hashimoto
2019 IEEE 32ND INTERNATIONAL CONFERENCE ON MICRO ELECTRO MECHANICAL SYSTEMS (MEMS)
(2019)
Article
Chemistry, Physical
Pravien Parthiban, Patrick S. Doyle, Michinao Hashimoto
Article
Chemistry, Multidisciplinary
Sindhu Vijayan, Michinao Hashimoto
