scholarly journals Numerical simulation of graphene in an external magnetic field

2014 ◽  
Vol 89 (24) ◽  
Author(s):  
D. L. Boyda ◽  
V. V. Braguta ◽  
S. N. Valgushev ◽  
M. I. Polikarpov ◽  
M. V. Ulybyshev
Keyword(s):  
Magnetic Field ◽  
Numerical Simulation ◽  
External Magnetic Field

Numerical Simulation of Magnetic Fluid Used in Sintering and Cooling Equipments Seals as a Functional Material

2011 ◽  
Vol 239-242 ◽  
pp. 3096-3099
Author(s):  
Ming Hua Bai ◽  
Hong Liang Zhou
Keyword(s):  
Magnetic Field ◽  
Numerical Simulation ◽  
Fluid Flow ◽  
External Magnetic Field ◽  
Magnetic Fluid ◽  
Permanent Magnets ◽  
Quiescent State ◽  
Flow State ◽  
Functional Material ◽  
Volume Force

Magnetic fluid as a functional material can produce volume force under external magnetic field, for the purpose of controlling the magnetic fluid flow state in the non-magnetic sealing groove with external magnetic field, the volume force is written as a function form of AZ to do with the numerical simulation of magnetic fluid flow in the sealing groove. The result shows that the magnetic fluid which distributes at the right-angle edges of the two permanent magnets nearby the separator presents unsteady swirl flow due to the volume force, while the rest magnetic fluid is in the quiescent state. It means that the magnetic fluid seal method can effectively solve the air leakage of band sintering machine and circular cooling machine.

scholarly journals Self-assembled artificial cilia

2009 ◽  
Vol 107 (5) ◽  
pp. 1844-1847 ◽  
Author(s):  
Mojca Vilfan ◽  
Anton Potočnik ◽  
Blaž Kavčič ◽  
Natan Osterman ◽  
Igor Poberaj ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Numerical Simulation ◽  
Reynolds Number ◽  
Fluid Flow ◽  
External Magnetic Field ◽  
Low Reynolds Number ◽  
Microfluidic Devices ◽  
Superparamagnetic Particles ◽  
Artificial Cilia ◽  
Biomimetic Cilia

Due to their small dimensions, microfluidic devices operate in the low Reynolds number regime. In this case, the hydrodynamics is governed by the viscosity rather than inertia and special elements have to be introduced into the system for mixing and pumping of fluids. Here we report on the realization of an effective pumping device that mimics a ciliated surface and imitates its motion to generate fluid flow. The artificial biomimetic cilia are constructed as long chains of spherical superparamagnetic particles, which self-assemble in an external magnetic field. Magnetic field is also used to actuate the cilia in a simple nonreciprocal manner, resulting in a fluid flow. We prove the concept by measuring the velocity of a cilia-pumped fluid as a function of height above the ciliated surface and investigate the influence of the beating asymmetry on the pumping performance. A numerical simulation was carried out that successfully reproduced the experimentally obtained data.

scholarly journals Thermodynamic properties of Heisenberg spin systems on a square lattice with the Dzyaloshinskii--Moriya interaction

2020 ◽  
Vol 20 (1) ◽  
pp. 63-73
Author(s):  
Vitalii Kapitan ◽  
◽  
Egor Vasiliev ◽  
Yuriy Shevchenko ◽  
Alexander Perzhu ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Numerical Simulation ◽  
External Magnetic Field ◽  
Thermodynamic Properties ◽  
Spin Systems ◽  
Square Lattice ◽  
Temperature Behaviour ◽  
Heisenberg Spin ◽  
Moriya Interaction

We present results of numerical simulation of thermodynamics for array of Classical Heisenberg spins placed on 2D square lattice. By using Metropolis and Wang--Landau methods we show the temperature behaviour of system with competing Heisenberg and Dzyaloshinskii--Moriya interaction (DMI) in contrast with classical Heisenberg system. We show the process of nucleating of skyrmion depending on the value of external magnetic field.

scholarly journals Computer Simulation of Magnetic Skyrmions

Proceedings ◽  
2019 ◽  
Vol 46 (1) ◽  
pp. 6
Author(s):  
Vitalii Kapitan ◽  
Egor Vasiliev ◽  
Alexander Perzhu
Keyword(s):  
Magnetic Field ◽  
Numerical Simulation ◽  
Computer Simulation ◽  
External Magnetic Field ◽  
Single Layer ◽  
Metropolis Algorithm ◽  
Square Lattice ◽  
Temperature Behaviour ◽  
Magnetic Skyrmions ◽  
Moriya Interaction

In this paper, we present the results of a numerical simulation of thermodynamics for the array of Classical Heisenberg spins placed on a 2D square lattice, which effectively represents the behaviour of a single layer. Using the Metropolis algorithm, we show the temperature behaviour of the system with a competing Heisenberg and Dzyaloshinskii–Moriya interaction (DMI) in contrast with the classical Heisenberg system. We show the process of nucleation of the skyrmion depending on the value of the external magnetic field. We proposed the controlling method for the movement of skyrmions.

scholarly journals Numerical Simulation of Ferrofluid Flow in Heterogeneous and Fractured Porous Media Based on Finite Element Method

2021 ◽  
Vol 9 ◽  
Author(s):  
Tao Huang ◽  
Xin Liao ◽  
Zhaoqin Huang ◽  
Renyi Wang
Keyword(s):  
Magnetic Field ◽  
Numerical Simulation ◽  
Porous Media ◽  
External Magnetic Field ◽  
Oil Recovery ◽  
Horizontal Tube ◽  
Fractured Porous Media ◽  
Secondary Fracture ◽  
Industrial Needs ◽  
Enhance Oil Recovery

Ferrofluid is a kind of magnetic fluid, the flow of which is controlled by an external magnetic field. Owing to this property, ferrofluid, as a new function material, has raised extensive concern in the oil industry. In this paper, the issue of ferrofluid flow in complex porous media has been studied by numerical simulation, and the validity and accuracy of the numerical algorithm are demonstrated through a 1-D horizontal tube example. Later, the effects of the magnetic force on ferrofluid flow in complex porous media, such as heterogeneous and fractured porous media, are investigated. The results show that there is basically no flow in low permeability or secondary fracture without a magnetic field, due to the characteristics of porous media and displacement pressure distribution. However, the ferrofluid flow velocity and domain can be changed by applying an external magnetic field. This novel phenomenon may provide a new idea to enhance oil recovery based on controllable flooding technology or meet other industrial needs by using ferrofluid.

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