Micromachines
·
2023
·Vol. 14
·期 7
·1277
·
IF 3.4
Chuang Wu,Haithm Yahya Mohammed Almuaalemi,A. S. M. Muhtasim Fuad Sohan,Binfeng Yin
Gel fibers prepared based on microfluidic laminar flow technology have important research value in constructing biomimetic scaffolds and tissue engineering. The key point of microfluidic laminar flow technology is to find the appropriate fluid flow rate in the micropipe. In order to explore the influence of flow rate on the laminar flow phenomenon of a microfluidic chip, a microfluidic chip composed of an intermediate main pipe and three surrounding outer pipes are designed, and the chip is prepared by photolithography and the composite molding method. Then, a syringe pump is used to inject different fluids into the microtubing, and the data of fluid motion are obtained through fluid dynamics simulation and finite element analysis. Finally, a series of optimal adjustments are made for different fluid composition and flow rate combinations to achieve the fluid’s stable laminar flow state. It was determined that when the concentration of sodium alginate in the outer phase was 1 wt% and the concentration of CaCl2in the inner phase was 0.1 wt%, the gel fiber prepared was in good shape, the flow rate was the most stable, and laminar flow was the most obvious when the flow rate of both was 1 mL/h. This study represents a preliminary achievement in exploring the laminar flow rate and fabricating gel fibers, thus offering significant reference value for investigating microfluidic laminar flow technology.Keywords:microfluidic technology;laminar flow;gel fiber;fluid dynamics;sodium alginate
研究领域:
生物工程
·
组织工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
PHYSICS OF FLUIDS
·
2024
·Vol. 36
·期 1
·
IF 4.1
Yu Jia-Jia,Jiang Lu-Yang,Huang Li,Li Gu-Yuan,Bake Maitiniyazi,Li You-Rong
Hydrodynamic cavitation, which occurs when the local pressure is below the saturated vapor pressure in hydrodynamic flow, is ubiquitous in fluid dynamics and implicated in a myriad of industrial and biomedical applications. Although extensively studied in isotropic liquids, corresponding investigations in anisotropic liquids are largely lacking. In this paper, the hydrodynamic cavitation in the bluff body bypass flow of nematic liquid crystal 5CB in the microchannel is experimentally investigated. By 5CB, we mean the thermotropic liquid crystal 4′-pentyl-4-biphenylcarbonitrile. When the Reynolds number is in the range of 3 × 10 −4 < Re < 1.2 × 10 −3 , a special flow phenomenon behind the bluff body is observed, namely, the disclination loop. The critical Reynolds number of cavitation inception varies with the shape of the bluff body, while the lowest value corresponds to the triangular bluff body. The hydrodynamic cavitation occurs in the Stokes flow regime with the Reynolds number significantly lower than 0.1 for all bluff bodies. There is a close relation between the oscillation behavior of cavitation domains and the structure of the bluff body. In addition, the pressure difference between the inlet and outlet of the microchannel shows linear relation with the Reynolds number rather than the quadratic relation for isotropic fluids, which proves the presence of shear thinning in the flow of nematic liquid crystals. The study in this paper on the hydrodynamic cavitation of nematic liquid crystal can broaden the research on providing new approaches for the enhancement of fluid mixing and heat transfer in microfluidic chips.
研究领域:
流体力学
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材料科学
·
微流控技术
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2022
·
IF 4.326
Yuanyuan Hui,Xin Feng,Haoliang Wang,Zai-Sha Mao,Chao Yang
Membrane fouling is a troublesome factor in the design and scale-up of stirred membrane reactors. Many efforts have been made to study the fouling mechanism in traditional membrane filtration. However, it is still ambiguous in stirred membrane reactors (SMRs). For this purpose, we investigated the effects of hydrodynamics on membrane filtration performance in SMRs under constant-pressure operation by combining experiment and computational fluid dynamics (CFD) simulation. The results indicate that the strong axial flow is beneficial in maintaining the stability of membrane permeation, while the strong radial flow works oppositely. In addition, the formation of the filtration cake increases the total membrane filtration resistance but keeps smaller particles from blocking the membrane surface channels, which leads to filtration resistance multiplying rapidly. Hence, the formation of the thick cake, strong axial flow, and weak radial flow is conducive to maintaining permeation flux in order to reduce the replacement of the membrane and improve the period of continuous production.
研究领域:
化学工程
·
环境工程
·
生物工程
✓ 已验证
DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY B-ANALYTICAL TECHNOLOGIES IN THE BIOMEDICAL AND LIFE SCIENCES
·
2016
·
IF 2.687
Shuang Guo,Bai-Ling Qiu,Chen-Qi Zhu,Ya-Ya Gao Yang,Di Wu,Qi-Hui Liang,Nan-Yin Han
Gravitational field-flow fractionation (GrFFF) is a useful technique for separation and characterization for micrometer-sized particles. Elution behavior of micrometer-sized particles in GrFFF was researched in this study. Particles in GrFFF channel are subject to hydrodynamic lift forces (HLF), fluid inertial forces and gravity, which drive them to different velocities by carrier flow, resulting in a size-based separation. Effects of ionic strength, flow rate and viscosity as well as methanol were investigated using polystyrene latex beads as model particles. This study is devoted to experimental verification of the effect of every factor and their comprehensive function. All experiments were performed to show isolated influence of every variable factor. The orthogonal design test was used to evaluate various factors comprehensively. Results suggested that retention ratio of particles increases with increasing flow rate or the viscosity of carrier liquid by adjusting external forces acting on particles. In addition, retention ratio increases as ionic strength decreases because of decreased electrostatic repulsion between particles and channel accumulation wall. As far as methanol, there is no general trend due to the change of both density and viscosity. On the basis of orthogonal design test it was found that viscosity of carrier liquid plays a significant role in determining resolution of micrometer-sized particles in GrFFF.
研究领域:
分析化学
·
胶体科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Alexandria Engineering Journal
·
2023
·
IF 6.8
Sakinah Idris,Anuar Jamaludin,Roslinda Nazar,Ioan Pop
The heightened thermal efficiency of hybrid nanofluids presents substantial practical uses in diverse industrial and engineering fields. Thus, the aims of this research are i) to analyze the impact of pertinent parameters towards flow and heat transfer of hybrid Cu-Al 2 O 3 /water nanofluid over permeable moving surface with mutual effects of magnetohydrodynamic (MHD), thermal radiation, Joule heating, and thermal slip condition and ii) to examine the nature of dual solutions. The similarity transformation reduces the complexity of the PDEs to a system of ODEs, which are then numerically solved using bvp4c MATLAB. Two solutions are observable when the surface move approaches the origin ( λ < 0 ) which leads to a stability analysis and validates the first solution as a stable and physically reliable solution. It was discovered at a 1:1 ratio of Cu and Al 2 O 3 volume concentrations immersed in water; the hybrid nanofluid offers a remarkable heat transportation ability than nanofluid and water. An escalation of thermal radiation and magnetic parameters contributed to 79 % and 9.35 % enhancement to the heat transfer rate. The growth in magnetic parameters promotes a delay in boundary layer separation however insignificantly impacted by thermal slip parameter and Eckert number.
研究领域:
工程热物理
·
流体力学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING & TECHNOLOGY
·
2013
·Vol. 36
·期 5
·851-862
·
IF 1.366
L.-J. Chen,H.-B. Dong,Q. Li,C.-C. Niu,A.-W. Zeng
To simulate the centrifugal short-path distillation process, both two phases and interfacial transport are taken into account simultaneously for the first time. A new computational fluid dynamics model based on the volume-of-fluid and species transport methods is built up to analyze the detailed flow and transfer characteristics. A binary system with dibutyl phthalate-dibutyl sebacate (DBP-DBS) is used as an example for the investigation with both numerical and experimental methods. The residence time and the effects of operating parameters such as evaporator temperature and feed flow rate are explored comparatively. The simulation result for the liquid-film thickness shows a satisfactory agreement with literature data. On the basis of the simulation results, we may also obtain detailed characteristics of the heat and mass transfer such as gradients in temperature and concentration and the liquid overall mass transfer coefficient.
研究领域:
化学工程
·
传热传质学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Hang-bo Zheng,Yuan-li Wang,Pei Zhang,Feng Ma,Peng-zhao Gao,Wen-ming Guo,Hang Qin,Xiao-pan Liu,Han-ning Xiao
The slow kinetics of Oxygen evolution reaction (OER) restricts the large-scale application of water electrolysis technology . It is reported that magnetic field can improve OER activity, but it is not clear how the AC magnetic field affects OER. Here, a series of NiCoFe-MOF-74 are reported, and it is found AC magnetic field can significantly enhance the alkaline OER activity at low current densities, but reduce the alkaline OER activity at high current densities, due to spin conservation, MHD effect, and induced electric field induced by AC magnetic field. In particular, when an AC magnetic field of 5.184 mT is applied, the overpotential at 10 mA cm −2 of NiCoFe-MOF-74 and carbon paper was reduced by 36.7% and 17.6%, respectively, but the overpotential at 40 mA cm −2 increased by 27.8% and 39.9%, respectively. This discovery provides a promising strategy for introducing an AC magnetic field to adjust the process of electrocatalytic reactions.
研究领域:
电化学
·
材料科学
·
催化反应
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2020
·
IF 3.573
Jian Wang,Fang Feng,Chang Wang,Wei-Cheng Yan,Weidong Shi
Ultrasonic atomization pyrolysis (UAP) is an effective method for the mass production of micro-/nano-photocatalysts; however, studies on particle-flow behaviors and the collection efficiency were seldom reported, which are very important for its scale-up and industrialization. In this study, a computational fluid dynamics model was developed to simulate the UAP process. Experiments were carried out via a self-designed UAP setup to validate the developed model. A two-way coupling discrete phase model considering particle collision and breakage was employed to investigate the influence of operating conditions (for example, carrying gas flow rate, precursor concentration, ultrasonic frequency, particle injection rate, and temperature) on the collection efficiency and particle-flow behaviors. Effects of particle polydispersity were also studied based on the developed model. Finally, three types of UAP reactors were designed based on the developed model, and the results suggested that a T-shape reactor possessed higher particle collection efficiency. This study could help to understand the particle-flow behaviors inside the reactor, and the developed model could serve as a tool to optimize the design and operation of the UAP reactor toward large-scale production of photocatalysts.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF PHYSICAL CHEMISTRY B
·
2021
·
IF 2.991
Jinxia Wang,Xiangyue Liu,Hongwei Xie,Huayi Yin,Qiushi Song,Zhiqiang Ning
The magnetohydrodynamic (MHD) effect was usually used to improve the mass transport during electrodeposition in a solution electrolyte. Herein, we reported the effect of a magnetic field on the electrode process of Al electrodeposition in a [Emim]Cl-AlCl3 ionic liquid composed of pure ions. Under a uniform and perpendicular magnetic field to the Cu electrode plane, electrochemical impedance spectroscopy (EIS) of the circuit, the cyclic voltammetry (CV) curves, and the different capacitances at the potential of zero charge (PZC) were measured, and the electrodeposition of aluminum was carried out at a constant current density. The results indicated that a vertical magnetic field significantly reduced the resistance (activation energy) for charge transfer of electrochemical reduction of Al2Cl7–; meanwhile, the capacitance of an electric double layer (EDL) and the density of the electrodeposited aluminum layer were increased.
研究领域:
电化学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
THERMOCHIMICA ACTA
·
2018
·
IF 2.189
Shunyao Wang,Xu Peng,Huabo Li,Zichao Guo,Liping Chen,Wanghua Chen
Cumene hydroperoxide (CHP) is prone to thermal decomposition in chemical industry, but there are few reports on the related phenomena in the reactor when decomposition occurs. In order to reveal the complex phenomena of fluid-solid coupled heat transfer, two-phase flow and multi-phase chemical reaction in the CHP decomposition, computational fluid dynamics (CFD) approach was applied to simulate the decomposition of CHP with different mass in a closed pressure vessel. Based on a known reaction scheme and the kinetics evaluated from differential scanning calorimeter (DSC) results, a comprehensive CFD model of CHP decomposition was created. As a result, detailed information on the reaction course was obtained, and distribution of temperature, pressure, reaction rate, and flow velocity in the vessel were also investigated. Finally, closed pressure vessel tests (CPVT) were conducted to verify the validity of the CFD model. This work is conducive to deeply understand the thermal decomposition and reactive hazards assessment of CHP.
研究领域:
化学工程
·
安全科学
✓ 已验证
DOI
高影响因子
OCEAN ENGINEERING
·
2019
·
IF 2.73
Jiangfan Chang,Xiaoyan He,Xiuqin Bai,Chengqing Yuan
Biofilm formation is crucial for subsequent biofouling. Various factors can affect the biofilm formation. Here we report the influence of hydrodynamic shear force on adhesion morphology and biofilm conformation of Bacillus sp. on stainless steel by a flow cell system. Static, laminar and turbulent conditions were selected for this study. The applicability of this flow cell was evaluated by computational fluid dynamics (CFD). Stable wall shear stresses were successfully obtained. The results showed that the spatial distribution of bacteria changed from single-cell to cluster under the effect of shear force and the higher shear force created smoother and denser clusters. The different morphology of clusters under different flow conditions was mainly due to the increased nutrient supply to the clusters with the increase of flow velocity. Under the effect of shear force, Bacillus sp. could change the shape and increase the production of extracellular polymeric substance which could reduce the effect of shear force and enhance the connection and adhesion, respectively. Under low shear force, biofilm preferred to form irregular and complicated structure which could lead to the formation of tower like biofilm and inhibit the external mass transfer . The results could shed some light on biofilm control strategies.
研究领域:
微生物学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2018
·Vol. 10
·期 3
·293
·
IF 2.935
Jiaxing Li,Lei Yang,Xiaoguang Fan,Fei Wang,Jing Zhang,Zhanyong Wang
Continuing efforts to develop novel smart materials are anticipated to upgrade the quality of life of humans. Thermo-responsive poly(N-isopropylacrylamide) and glucose-responsive phenylboronic acid—typical representatives—are often integrated as multi-stimuli-sensitive materials, but few are available for side-by-side comparisons with their properties. In this study, both copolymers bearingN-isopropylacrylamide (NIPAAm), with or without 3-acrylamidophenylboronic acid (AAPBA), were synthesized by free radical polymerization, and characterized by Fourier transform infrared spectrometry, nuclear magnetic resonance hydrogen spectroscopy and gel permeation chromatography. Dynamic light scattering was used to analyze and compare the responsive behaviors of the copolymers in different aqueous solutions. Atomic force microscopy was also employed to investigate the apparent morphology changes with particle sizes. The results demonstrated that the introduction of NIPAAm endowed the composite materials with thermosensitivity, whereas the addition of AAPBA lowered the molecular weight of the copolymers, intensified the intermolecular aggregation of the nanoparticles, reduced the lower critical solution temperature (LCST) of the composites, and accordingly allowed the copolymers to respond to glucose. It was also concluded that the responding of smart copolymers to operating parameters can be activated only under special conditions, and copolymer dimension and conformation were affected by inter/intramolecular interactions.Keywords:poly(N-isopropylacrylamide);phenylboronic acid;smart responsive behavior;hydrodynamic diameter;dynamic light scattering
研究领域:
高分子化学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）