Chaotic mixing
View article: Frontiers of chaotic advection
Frontiers of chaotic advection Open
We review the present position of and survey future perspectives in the physics of chaotic advection; the field that emerged three decades ago at the intersection of fluid mechanics and nonlinear dynamics, which encompasses a range of appl…
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Understanding the formation mechanism of lipid nanoparticles in microfluidic devices with chaotic micromixers Open
Lipid nanoparticles (LNPs) or liposomes are the most widely used drug carriers for nanomedicines. The size of LNPs is one of the essential factors affecting drug delivery efficiency and therapeutic efficiency. Here, we demonstrated the eff…
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Analysis of Passive Mixing in a Serpentine Microchannel with Sinusoidal Side Walls Open
Sample mixing is difficult in microfluidic devices because of laminar flow. Micromixers are designed to ensure the optimal use of miniaturized devices. The present study aims to design a chaotic-advection-based passive micromixer with enha…
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An easily fabricated three-dimensional threaded lemniscate-shaped micromixer for a wide range of flow rates Open
Mixing fluid samples or reactants is a paramount function in the fields of micro total analysis system (μTAS) and microchemical processing. However, rapid and efficient fluid mixing is difficult to achieve inside microchannels because of t…
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A “twisted” microfluidic mixer suitable for a wide range of flow rate applications Open
This paper proposes a new “twisted” 3D microfluidic mixer fabricated by a laser writing/microfabrication technique. Effective and efficient mixing using the twisted micromixers can be obtained by combining two general chaotic mixing mechan…
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A New Pseudorandom Bit Generator Based on Mixing Three‐Dimensional Chen Chaotic System with a Chaotic Tactics Open
In this paper, a new chaotic system is proposed based on mixing three‐dimensional Chen chaotic system with a chaotic tactics. This new system is proved to be chaotic under Wiggins’ chaos definition and can generate chaotic sequences with h…
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Alignment of Nonspherical Active Particles in Chaotic Flows Open
We study the orientation statistics of spheroidal, axisymmetric microswimmers, with shapes ranging from disks to rods, swimming in chaotic, moderately turbulent flows. Numerical simulations show that rodlike active particles preferentially…
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Novel 3-D T-Shaped Passive Micromixer Design with Helicoidal Flows Open
Laminar fluid flow and advection-dominant transport produce ineffective mixing conditions in micromixers. In these systems, a desirable fluid mixing over a short distance may be achieved using special geometries in which complex flow paths…
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Scalar Signatures of Chaotic Mixing in Porous Media Open
Steady laminar flows through porous media spontaneously generate Lagrangian chaos at pore scale, with qualitative implications for a range of transport, reactive, and biological processes. The characterization and understanding of mixing d…
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Chaotic mixing in crystalline granular media Open
We study the Lagrangian kinematics of steady three-dimensional Stokes flow over simple cubic (SC) and body-centred cubic (BCC) lattices of close-packed spheres, and uncover the mechanisms governing chaotic mixing in these crystalline struc…
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Mixing by Unstirring: Hyperuniform Dispersion of Interacting Particles upon Chaotic Advection Open
We show how to achieve both fast and hyperuniform dispersions of particles in viscous fluids. To do so, we first extend the concept of critical random organization to chaotic drives. We show how palindromic sequences of chaotic advection c…
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Space-Group Symmetries Generate Chaotic Fluid Advection in Crystalline Granular Media Open
The classical connection between symmetry breaking and the onset of chaos in dynamical systems harks back to the seminal theory of Noether [Transp. Theory Statist. Phys. 1, 186 (1918)10.1080/00411457108231446]. We study the Lagrangian kine…
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An Investigation of Flow Patterns and Mixing Characteristics in a Cross-Shaped Micromixer within the Laminar Regime Open
A fast mixing is critical for subsequent practical development of microfluidic devices, which are often used for assays in the detection of reagents and samples. The present work sets up computational fluid dynamics simulations to explore …
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A physically extended Lorenz system Open
The Lorenz system is a simplified model of Rayleigh-Bénard convection, a thermally driven fluid convection between two parallel plates. Two additional physical ingredients are considered in the governing equations, namely, rotation of the …
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Diffusiophoresis at the macroscale Open
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Observability of laminar bidimensional fluid flows seen as autonomous chaotic systems Open
Lagrangian transport in the dynamical systems approach has so far been investigated disregarding the connection between the whole state space and the concept of observability. Key issues such as the definitions of Lagrangian and chaotic mi…
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Chaotic characteristics enhanced by impeller of perturbed six-bent-bladed turbine in stirred tank Open
The fundamental way of improving the mixing efficiency is to induce the chaotic flow in a stirred vessel. The impeller form plays an important role for changing the structure of flow field and realizing chaotic mixing. Based on the velocit…
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Inertial Micromixing in Curved Serpentine Micromixers with Different Curve Angles Open
Micromixers are of considerable significance in many microfluidics system applications, from chemical reactions to biological analysis processes. Passive micromixers, which rely solely on their geometry, have the advantages of low cost and…
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Synchronized chaotic targeting and acceleration of surface chemistry in prebiotic hydrothermal microenvironments Open
Significance We describe a physical mechanism capable of achieving simultaneous mixing and focused enrichment in hydrothermal pore microenvironments. Microscale chaotic advection established in response to a temperature gradient paradoxica…
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The diffusive sheet method for scalar mixing Open
The diffusive strip method (DSM) is a near-exact numerical method for mixing computations initially developed in two dimensions (Meunier & Villermaux, J. Fluid Mech. , vol. 662, 2010, pp. 134–172). The method, which consists of following s…
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Modular, Discrete Micromixer Elements Fabricated by 3D Printing Open
3D printing facilitates the straightforward construction of microchannels with complex three-dimensional architectures. Here, we demonstrate 3D-printed modular mixing components that operate on the basis of splitting and recombining fluid …
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Fluid viscoelasticity suppresses chaotic convection and mixing due to electrokinetic instability Open
When two fluids of different electrical conductivities are transported side by side in a microfluidic device under the influence of an electric field, an electrokinetic instability (EKI) is often generated after some critical values of the…
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Accurate separation of mixed high-dimension optical-chaotic signals using optical reservoir computing based on optically pumped VCSELs Open
In this work, with the mixing fractions being known in advance or unknown, the schemes and theories for the separations of two groups of the mixed optical chaotic signals are proposed in detail, using the VCSEL-based reservoir computing (R…
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A Numerical Research of Herringbone Passive Mixer at Low Reynold Number Regime Open
Passive mixing based on microfluidics has won its popularity for its unique advantage, including easier operation, more efficient mixing performance and higher access to high integrity. The time-scale and performance of mixing process are …
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Emerging Mesoscale Flows and Chaotic Advection in Dense Active Matter Open
We study two models of overdamped self-propelled disks in two dimensions, with and without aligning interactions. Both models support active mesoscale flows, leading to chaotic advection and transport over large length scales in their homo…
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Understanding the mixing process in 3D microfluidic nozzle/diffuser systems: simulations and experiments Open
We characterise computationally and experimentally a three-dimensional (3D) microfluidic passive mixer for various Reynolds numbers ranging from 1 to 100, corresponding to primary flow rates of 10-870 mu l min(-1). The 3D mixing channel is…
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Optimization of an Active Electrokinetic Micromixer Based on the Number and Arrangement of Microelectrodes Open
This paper reports enhancement of mixing process via electroosmotic phenomenon using a microelectrode system, which is structured by aligning a number of electrodes placed on the walls of a mixing chamber integrated within a T-Shape microm…
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Strong effect of fluid rheology on electrokinetic instability and subsequent mixing phenomena in a microfluidic T-junction Open
When two fluids of different electrical conductivities are transported under the influence of an electric field, the electrokinetic instability (EKI) phenomenon often triggers in a microfluidic device once the electric field strength and c…
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3D Mixing Dynamics in T‐Jet Mixers Open
The dynamic flow field in T‐jet mixers is characterized by means of 3D computational fluid dynamics simulations. The main goal of this work is to identify and discuss the chaotic flow regime in T‐jet reactors and the parameters that enable…
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The Effect of Non-Uniform Magnetic Field on the Efficiency of Mixing in Droplet-Based Microfluidics: A Numerical Investigation Open
Achieving high efficiency and throughput in droplet-based mixing over a small characteristic length, such as microfluidic channels, is one of the crucial parameters in Lab-on-a-Chip (LOC) applications. One solution to achieve efficient mix…