Article
Energy & Fuels
Yanwen Gong, Xueni Cheng
Summary: Electroosmotic micromixing is a valuable technique in microanalysis systems, and a contraction-expansion microchannel is used to study the mixing caused by AC electroosmotic. The flow and concentration field distributions in the microchannel are analyzed, and the influence of AC electric fields on circulation flows and rotating vortices is observed. The study shows that the mixing quality is dependent on the relative magnitudes of the electroosmotic force and inertia force, and factors such as inlet velocity, frequency, and voltage also affect the vortex formation and mixing performance.
CHEMICAL ENGINEERING AND PROCESSING-PROCESS INTENSIFICATION
(2023)
Article
Chemistry, Analytical
Zhong Chen, Yalin Wang, Song Zhou
Summary: This study presents the design and numerical simulations of a passive micromixer and a novel active electroosmotic micromixer. The results show that electroosmosis can effectively induce fluid mixing. The effects of key parameters on the mixing performance were discussed through numerical analysis. The proposed electroosmotic micromixer has a simple structure, fast response, and high mixing index.
Article
Energy & Fuels
Ahmad Najafpour, Khashayar Hosseinzadeh, Shahin Akbari, Mehdi Mahboobtosi, A. A. Ranjbar, D. D. Ganji
Summary: This study investigates the mixing characteristics of an innovative T-shaped micromixer equipped with a twisted structure using numerical computations. The findings show that the T-shaped micromixer with twisted patterns significantly improves the mixing performance under certain conditions.
CHEMICAL ENGINEERING AND PROCESSING-PROCESS INTENSIFICATION
(2023)
Article
Multidisciplinary Sciences
Vahabodin Goodarzi, Saeed Hayati Jafarbeygi, Ramezan Ali Taheri, Mikhail Sheremet, Mohammad Ghalambaz
Summary: The study investigates the improvement of mixing efficiency using conductive obstacles with special geometry in micromixers. By changing the span length, concavity direction, and orientation angle of the curved arc plates, as well as using multiple non-symmetric plates, it was found that mixing efficiency can be significantly increased by creating vortices in the flow.
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
Chemistry, Analytical
Alireza Farahinia, Jafar Jamaati, Hamid Niazmand, Wenjun Zhang
Summary: Mixing in microfluidic systems can be achieved more efficiently by utilizing electroosmotic flow combined with heterogeneous surface properties to create rotational currents and improve mixing efficiency. The presence of a heterogeneous zeta-potential patch on microchannel walls affects mixing proficiency, with the slip coefficient playing a significant role in enhancing mixing efficiency in electroosmotic micromixers. Increasing the Reynolds number and slip coefficient on heterogeneous channel walls can further enhance mixing efficiency, although a high slip coefficient may lead to a sharp decrease in mixing efficiency, particularly at higher Reynolds numbers.
Article
Engineering, Multidisciplinary
Ramezan Ali Taheri, Vahabodin Goodarzi
Summary: A high effective micromixer with baffles and curved walls is proposed in this study to enhance mixing efficiency. Numerical analysis and experimental validation show that the centrifugal force and flow separation are the major factors contributing to the improvement of mixing efficiency. The micromixer is able to achieve species mixing of about 100%, which is 61.58% higher than the conventional design.
ENGINEERING ANALYSIS WITH BOUNDARY ELEMENTS
(2022)
Article
Engineering, Multidisciplinary
Ranjan Prakash, Mohammad Zunaid, Samsher Samsher
Summary: This paper conducts computational analysis on the mixing index of various T shape mixers by CFD simulation. The findings show that T mixer with bend shape mixing channel achieves the best mixing quality, followed by the offset inlets T mixer with bend shape, and the simple T shape mixer. The pressure drop in the mixers is influenced by factors such as aspect ratio and chaotic advection mechanisms.
JOURNAL OF ENGINEERING RESEARCH
(2021)
Article
Thermodynamics
Shuai Yuan, Bingyan Jiang, Fengze Jiang, Dietmar Drummer, Mingyong Zhou
Summary: This study proposes a passive planar micromixer with narrow gaps and obstacles arranged in mixing units, which utilizes micro-jets and bent baffles to split and recombine streams and promote vortex formation for improving mixing efficiency. By conducting a comprehensive geometrical study and analyzing various parameters, it is found that reducing gap width, increasing gap length, using staggered Z-shaped baffles, and employing octagonal mixing units can enhance mixing efficiency. A novel micromixer with close to 0.8 mixing performance at Re = 0.5 and a short distance of 2800 μm is proposed, fabricated, and tested.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
Sak Jie Tan, Kok Hwa Yu, Junior Sarjit Singh Sidhu, Mohd Azmi Ismail
Summary: The paper examines the relationship between mixing length and mixing index for two streams of liquid mixing in a two-dimensional channel, proposing a new correlation for mixing length. The correlation is applicable for a specific range of mixing indices and is valid as long as laminar mixing flow prevails.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2022)
Article
Energy & Fuels
Shulei Chen, Ming Hao, Junyi Shang, Yue Jiang, Yuanhua Xie, Yaoshuai Ba, Kun Liu
Summary: This paper presents three-dimensional modified micromixers with staggered E-shape mixing units. Numerical analysis shows that excellent mixing performance can be achieved in these mixers. The mixing index can exceed 70% in certain flow regimes, surpassing traditional mixers. The proposed mixers exhibit both uniform particle distribution and chaotic flow generation, resulting in better mixing performance compared to existing mixers.
CHEMICAL ENGINEERING AND PROCESSING-PROCESS INTENSIFICATION
(2022)
Article
Chemistry, Multidisciplinary
Junyao Wang, Xingyu Chen, Huan Liu, Yunpeng Li, Tianhong Lang, Rui Wang, Bowen Cui, Weihua Zhu
Summary: This paper presents a helical three-dimensional passive micromixer fabricated through 3D printing and polymer dissolution technology, which effectively improves the mixing efficiency according to experimental results.
Article
Nanoscience & Nanotechnology
Zhongli Wu, Yu Li, Lei Xu, Dongmei Bao, Xiying Zhang, Tingjian Zhang
Summary: This paper investigates the effects of different block structures on the mixing performance and pressure drop of passive micromixers. The numerical simulation results show that the micromixer with equilateral triangle blocks achieves high mixing efficiency by breaking the laminar flow state.
Article
Chemistry, Applied
Yunyan Guo, Jinqiang Zhou, Shujie Liu, Chongwei An, Jingyu Wang, Bidong Wu
Summary: Passive micromixers are commonly used in the preparation of ultrafine explosives due to their effective mixing and necessary safety. A novel passive micromixer was designed to produce nano-TATB and computational fluid dynamics (CFD) was used to simulate its mixing performance. The results demonstrate that the proposed micromixer exhibits good mixing performance at a Reynolds number range of 0.1 to 100, with a pressure drop of less than 28204 Pa at Re=100. A microfluidic recrystallization system was established and nano-TATB was successfully prepared using the new micromixer.
PROPELLANTS EXPLOSIVES PYROTECHNICS
(2023)
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.
