A numerical study on the effect of static magnetic field on the hemodynamics of magnetic fluid in biological porous media

A numerical analysis is conducted in order to study the flow state and thermal characteristics of a magnetic fluid heat transport device. A simple geometrical model of the device is considered in the present numerical study. The highly simplified marker-and-cell (HSMAC) method is adopted for the numerical analysis, where the transient solutions are obtained in the two-dimensional axisymmetric computational plane. From results of the numerical calculation it can be shown that the vortex zone appears when a magnetic field is applied and the configuration of flow associated with the vortex zone changes for variation in the magnetic field, increasing or decreasing the heat transport capability dependent upon the conditions of the device.

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Numerical Study of the Effect of Magnetic Field on Nanofluid Heat Transfer in Metal Foam Environment

Geofluids ◽

10.1155/2021/3209855 ◽

2021 ◽

Vol 2021 ◽

pp. 1-14

Author(s):

Hamid Shafiee ◽

Elaheh NikzadehAbbasi ◽

Majid Soltani

Keyword(s):

Magnetic Field ◽

Heat Transfer ◽

Porous Medium ◽

Porous Media ◽

Fluid Flow ◽

Volume Fraction ◽

Numerical Study ◽

Computational Simulation ◽

Thermodynamic Efficiency ◽

Two Phase

The magnetic field can act as a suitable control parameter for heat transfer and fluid flow. It can also be used to maximize thermodynamic efficiency in a variety of fields. Nanofluids and porous media are common methods to increase heat transfer. In addition to improving heat transfer, porous media can increase pressure drop. This research is a computational simulation of the impacts of a magnetic field induced into a cylinder in a porous medium for a volume fraction of 0.2 water/Al2O3 nanofluid with a diameter of 10 μm inside the cylinder. For a wide variety of controlling parameters, simulations have been made. The fluid flow in the porous medium is explained using the Darcy-Brinkman-Forchheimer equation, and the nanofluid flow is represented utilizing a two-phase mixed approach as a two-phase flow. In addition, simulations were run in a slow flow state using the finite volume method. The mean Nusselt number and performance evaluation criteria (PEC) were studied for different Darcy and Hartmann numbers. The results show that the amount of heat transfer coefficient increases with increasing the number of Hartmann and Darcy. In addition, the composition of the nanofluid in the base fluid enhanced the PEC in all instances. Furthermore, the PEC has gained its highest value at the conditions relating to the permeable porous medium.

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Adiabatic quantum estimation: A numerical study of the Heisenberg XX model with antisymmetric exchange

International Journal of Quantum Information ◽

10.1142/s0219749920400018 ◽

2020 ◽

pp. 2040001

Author(s):

L. Fathi Shadehi ◽

H. Rangani Jahromi ◽

M. Ghanaatian

Keyword(s):

Magnetic Field ◽

Static Magnetic Field ◽

Numerical Study ◽

Quantum Fisher Information ◽

Spin Coupling ◽

Azimuthal Direction ◽

Qubit System ◽

Polar Orientation ◽

The One ◽

Rotating Field

In this paper, we address the adiabatic technique for quantum estimation of the azimuthal orientation of a magnetic field. Exactly solving a model consisting of a two-qubit system, where one of which is driven by a static magnetic field while the other is coupled with the magnetic field rotating adiabatically, we obtain the analytical expression of the quantum Fisher information (QFI). We investigate how the two-qubit system can be used to probe the azimuthal direction of the field and analyze the roles of the intensities of the magnetic fields, Dzyaloshinskii–Moriya (DM) interaction, spin–spin coupling coefficient, and the polar orientation of the rotating field on the precision of the estimation. In particular, it is illustrated that the QFI trapping or saturation may occur if the qubit is subjected to a strong rotating field. Moreover, we discuss how the azimuthal direction of the rotating field can be estimated using only the qubit not affected by that field and investigate the conditions under which this strategy is more efficient than use of the qubit locally interacting with the adiabatically rotating field. Interestingly, in the one-qubit scenario, it was found that when the rotating field is weak, the best estimation is achieved by subjecting the probe to a static magnetic field.

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A NUMERICAL STUDY ON THE MAGNETIC FLUID FLOW IN A CHANNEL SURROUNDING A PERMANENT MAGNET UNDER TEMPERATURE FIELD

Modern Physics Letters B ◽

10.1142/s0217984907013535 ◽

2007 ◽

Vol 21 (19) ◽

pp. 1271-1283 ◽

Cited By ~ 1

Author(s):

X. L. LI ◽

K. L. YAO ◽

Z. L. LIU

Keyword(s):

Magnetic Field ◽

Permanent Magnet ◽

Magnetic Fluid ◽

Numerical Study ◽

Drug Carrier ◽

Temperature Fields ◽

Gradient Magnetic Field ◽

Local Skin ◽

High Gradient ◽

Magnetic Source

It was investigated that the magnetic fluid which can be the carrier of magnetic particles or magnetic drug carrier particles (MDCP) flows surrounding a permanent magnet in a channel under the influence of high gradient magnetic field and the temperature difference between upper and lower boundaries of the channel. It is considered that the magnetization of the fluid varies linearly with temperature and magnetic field intensity. The numerical solution of above model is described by a coupled and nonlinear system of PDEs. Results indicate that the presence of magnetic and temperature fields appreciably influence the flow field; vortexes arise almost around the magnetic source and also appear near the upper left and lower right boundaries. The temperature, local skin friction coefficient and rate of heat transfer are all affected by the magnitude and position of the magnetic source, they fluctuate evidently near the high gradient magnetic field area.

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