Article
Biochemical Research Methods
Sisi Huang, Yihao Wu, Yifan Wang, Xiaoling Hu, Kui Song
Summary: This research proposes and studies an embedded obstacle-type micromixer-concentration gradient generator based on capillary self-driven. The experimental results agree with the simulation results. The mixing efficiency increases along both the mixing channel and palisade length, with higher efficiency in the middle small channel of the palisade-shape area and lower efficiency on both sides.
Article
Chemistry, Analytical
Chengfa Wang
Summary: This article presents a micromixer based on vortices generated by nonuniform but same polarity zeta potentials in a T-type microchannel under a direct current electric field. The mixing performance is better when the channel width and the zeta potential ratio of the modified section to the unmodified section are smaller. Stronger electrokinetic vortices result in better mixing performance when the length ratio of the modified section to the unmodified section of the outlet channel is larger.
Article
Nanoscience & Nanotechnology
Wenwen Yuan, Hang Yuan, Keran Jiao, Jia Zhu, Eng Gee Lim, Ivona Mitrovic, Sixuan Duan, Yongjie Wang, Shan Cong, Chun Zhao, Jie Sun, Xinyu Liu, Pengfei Song
Summary: Nanofibrillated cellulose paper (nanopaper) is a promising substrate material for paper-based microfluidics due to its smooth surface, high transparency, nanofiber matrix, and tunable properties. However, current patterning techniques have limitations. This paper presents a simple microembossing method for patterning nanopaper microchannels down to 200 μm, which is 4 times better than existing methods and time-saving. The developed microchannels enable the creation of high-performance nanopaper-based analytical devices.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Physical
P. Sadeghi, E. Kjeang
Summary: A mathematical model is developed and validated for electrochemical energy conversion in paper-based, capillary-driven, microfluidic flow cells. By refining the Nernst-Planck equation, a 2D model is able to accurately represent a 3D cell in unsteady flows. The model is used to optimize the flow architecture and microstructure of the electrodes and absorbent pad, resulting in significant improvements in power output, runtime, and energy efficiency of the cell.
JOURNAL OF POWER SOURCES
(2022)
Article
Engineering, Environmental
Yonghai Zhang, Hongqiang Chen, Xiong Zhao, Xiang Ma, Lei Huang, Yinan Qiu, Jinjia Wei, Nanjing Hao
Summary: This paper introduces a robust acoustofluidic bubble-driven micromixer for the controllable synthesis of functional nano-array inside a glass capillary, which exhibits efficient photodegradation and metal ion enrichment. The morphology, density, and size of the nano-array can be precisely adjusted by reactant type, seeding phase, and reaction time. The ZnO nanorod array shows superior degradation efficiency and Cu2+ enrichment performance.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Engineering, Mechanical
W. L. N. Buglie, K. F. Tamrin
Summary: The proposed cylindrical magneto-hydrodynamic (MHD) micromixer combines the characteristics of passive and active micromixers, utilizing the pumping capability of the MHD principle to enhance mixing performance. Experimental results show that the mixing efficiency increases linearly with the supplied electrical potential within a certain range of flow rates. This micromixer offers strong control, using inexpensive materials and a simple design.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART E-JOURNAL OF PROCESS MECHANICAL ENGINEERING
(2022)
Article
Thermodynamics
Parag P. Thakur, Tushar S. Khapane, Shriram S. Sonawane
Summary: This study compared the performance of alumina/fly ash and silica/fly ash-based nanofluids in direct absorption solar collectors. The results indicated that alumina/fly ash-based nanofluids exhibited higher thermal efficiency and exergy efficiency compared to silica/fly ash-based nanofluids.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Physics, Applied
Yue Tian, Xueye Chen, Xiangwei Zeng, Xiangyang Wang, Xingxing Yu, Yongbiao Ma, Qingdong Wang
Summary: This paper investigates the design of a novel passive micromixer and optimization of mixing efficiency. Through continuous optimization of the micromixer structure, the mixing efficiency has been significantly improved to over 95%.
INTERNATIONAL JOURNAL OF MODERN PHYSICS B
(2021)
Article
Biochemical Research Methods
Junwoo Lee, Yong Kyoung Yoo, Dohwan Lee, Cheonjung Kim, Kang Hyeon Kim, Seungmin Lee, Seungmin Kwak, Ji Yoon Kang, Hyungsuk Kim, Dae Sung Yoon, Don Hur, Jeong Hoon Lee
Summary: Ion concentration polarization (ICP) is a preconcentration technique with the potential for high preconcentration factor, but faces challenges of instability and low efficiency under physiological conditions. A sequentially driven ICP process has been proposed to enhance the preconcentration of highly ionic raw samples without increasing the electric field, resulting in significant preconcentration factor and signal enhancement in enzyme-linked immunosorbent assay (ELISA) using tau protein.
Article
Thermodynamics
Yi Peng, Zhibin Li, Shaobo Li, Bin Cao, Xuan Wu, Xianfeng Zhao
Summary: The paper presents a zigzag-serpentine microchannel heat sink (ZSMHS) designed to study heat transfer and hydraulic performance through experiments. Different angles of the zigzag microchannel were investigated, with 30 degrees providing the lowest pressure drop, friction coefficient, and thermal resistance. The serpentine microchannel improved the hydraulic performance of the ZSMHS.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2021)
Article
Chemistry, Analytical
Yuwen Lu, Wei Tan, Shuoshuo Mu, Guorui Zhu
Summary: In this study, we proposed an acoustic-inertial micromixer based on multi-vortex synergy by introducing inertia into acoustic micromixer. The device contains side-wall sharp-edge structure and contraction-expansion array structure to enhance the acoustic streaming with inertial vortices. Rapider mixing and wider operating ranges were achieved in this device at lower driving voltages compared with conventional acoustic micromixers.
ANALYTICA CHIMICA ACTA
(2023)
Article
Engineering, Manufacturing
Minghao Bi, Lingwei Xia, Phuong Tran, Zhi Li, Qian Wan, Li Wang, Wei Shen, Guowei Ma, Yi Min Xie
Summary: This paper presents a novel framework for generating a globally continuous toolpath for large format additive manufacturing (LFAM) with both solid and partial infill designs. The proposed algorithm uses outward contour and double offset schemes to generate smooth curves for primary volume-filling paths, and extends zigzag lines from the closest contours to cover unfilled areas. A contour layer-wise connection based on the depth-first-search algorithm is then performed to create a globally continuous path. Post-processing is applied to optimize the coverage and curvature of the toolpath design. The algorithm outperforms other state-of-the-art methods in terms of print quality, sharp turns, and fabrication efficiency. Two experiments demonstrate the benefits of the proposed continuous toolpath for LFAM of topology optimized structures.
ADDITIVE MANUFACTURING
(2022)
Article
Energy & Fuels
Lei Zhang, Jia Li, Mingxing Liu, Guiying Tian, Penggao Cheng, Jianping Zhang, Na Tang
Summary: A novel internal structure in a facile continuous flow micromixer is developed to enhance mixing effect through computational fluid dynamics (CFD) simulation. The reliability of the simulation is validated by comparing the fluid mixing performance with an authentic transparent micromixer following the mathematical model. The addition of cubic structure inside convex-concave structures improves the mixing index and reduces flow resistance by increasing fluid-to-fluid interface area.
CHEMICAL ENGINEERING AND PROCESSING-PROCESS INTENSIFICATION
(2023)
Article
Thermodynamics
Amrendra Kumar, Nirmal K. K. Manna, Sandip Sarkar, Nirmalendu Biswas
Summary: In micro-scale sensitive medicinal and biochemical systems, the improvement of mixing efficiency is crucial despite small velocity limitations. This study investigates the key parameters and their impact on mixing efficiency in a new two-dimensional electroosmotic micromixer. The results demonstrate the significance of electrode polarity configuration and an increase in electrode pairs in optimizing fluid mixing.
NANOSCALE AND MICROSCALE THERMOPHYSICAL ENGINEERING
(2023)
Article
Mechanics
Dong Niu, Jinlan Chen, Ming Xiong, Yunyi Cao, Chunmeng He, Jinju Chen, Hongzhong Liu
Summary: Passive micromixing can be enhanced by lateral microstructures, such as cross-scale staggered baffles (CSBs) and paired trapezoidal microstructures (PTMs), to improve the mixing efficiency of laminar flows in micromixers. The effects of these microstructures vary with different Re conditions and can also regulate the flow field in curved channels, leading to improved mixing efficiency.
