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Fluids
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Recent Advances in Hydrodynamics and Magnetised Fluids
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Recent Advances in Hydrodynamics and Magnetised Fluids

A special issue of Fluids (ISSN 2311-5521).

Deadline for manuscript submissions: closed (20 December 2022) | Viewed by 5223

Special Issue Editor

Prof. Dr. Ahmed Rashad

E-Mail Website
Guest Editor
Department of Mathematics, Aswan University, Faculty of Science, 81528 Aswan, Egypt
Interests: fluid dynamic; boundary layers theory; cavities; heat and mass transfer; porous media; nanofluids; hybrid nanofluid

Special Issue Information

Dear Colleagues,

Magnetic fluids are well known to be a colloidal suspension of various delicate particles of a solid ferromagnetic material in a transporter fluid, such as hydrocarbon, water,  ester, and fluorocarbon. A most significant characteristic is that the fluid that can respond to the magnetic field. This feature is an outcome from the magnetic body strength occurring in magnetic field. It is the presence of these synthetic substances that produces the exploration of magnetic fluid dynamics possible. There are two obvious ways to create a magnetic fluid: size diminishing of chemical precipitation of small particles, coarse material. Size decrease has been achieved by electrolysis, sparkle evaporation–condensation, and grinding.  The fluid dynamics of magneto-fluids vary from common fluids in that strains of magnetic principles manifest and, unlike in magnetohydrodynamics, the requirement is not electrical currents. Magnetic fluid motives the nonmagnetic fluid in the existence of tangential applied field.

Prof. Dr. Ahmed Rashad
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Fluids is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1800 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • magnetic fluids
  • ferromagnetic
  • magnetohydrodynamics
  • nanofluids
  • heat and mass transfer
  • porous medium

Published Papers (3 papers)

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Research

11 pages, 3177 KiB  
Article
Dynamics of Magnetic Fluids and Bidisperse Magnetic Systems under Oscillatory Shear
by Elena Shel’deshova, Alexander Churaev and Petr Ryapolov
Fluids 2023, 8(2), 47; https://doi.org/10.3390/fluids8020047 - 28 Jan 2023
Cited by 5 | Viewed by 1633
Abstract
This article presents the results of a study on the dynamics of a volume of magnetic fluid levitating in a uniform magnetic field of an electromagnet experiencing an oscillatory shift. Samples with different physical parameters were considered, and the dependence of the magnetoviscous [...] Read more.
This article presents the results of a study on the dynamics of a volume of magnetic fluid levitating in a uniform magnetic field of an electromagnet experiencing an oscillatory shift. Samples with different physical parameters were considered, and the dependence of the magnetoviscous effect was studied. It showed that the greatest influence on the dynamics of a magnetic fluid that experiences vibrational-shear and magnetic-viscosity effects is exerted by the sample microstructure and the presence of large magnetic particles. The results of this work can be used in the development of a technique for magnetic fluid samples express testing, as well as in the development of acceleration and vibration sensors based on magnetic fluids Full article
(This article belongs to the Special Issue Recent Advances in Hydrodynamics and Magnetised Fluids)
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11 pages, 8108 KiB  
Article
Dynamics of Nonmagnetic and Magnetic Emulsions in Microchannels of Various Materials
by Dariya Kalyuzhnaya, Evgeniy Sokolov, Anastasia Vasilyeva, Irina Sutarina and Petr Ryapolov
Fluids 2023, 8(2), 42; https://doi.org/10.3390/fluids8020042 - 25 Jan 2023
Cited by 3 | Viewed by 1417
Abstract
The formation of droplets in microchannels (droplet microfluidics) has a large number of applications, such as in micro-dosing and gas meters. This paper considers the dynamics of direct and inverse emulsions based on water, polydimethylsiloxane, and synthetic and mineral oil in microfluidic chips [...] Read more.
The formation of droplets in microchannels (droplet microfluidics) has a large number of applications, such as in micro-dosing and gas meters. This paper considers the dynamics of direct and inverse emulsions based on water, polydimethylsiloxane, and synthetic and mineral oil in microfluidic chips based on two technologies: glass–parafilm–glass sandwich structures and removable scaffold in a silicone compound. It is shown that wettability, roughness and chip wall material; channel thickness; magnetic fluid flow rate; and magnetic field strength affect the size of emulsion droplets formed in a microfluidic chip. The addition of another mechanism for regulating the hydrodynamics of emulsions using a magnetic field opens up new possibilities for the development of promising devices. Full article
(This article belongs to the Special Issue Recent Advances in Hydrodynamics and Magnetised Fluids)
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13 pages, 14736 KiB  
Article
Formation and Behaviour of Active Droplets and Bubbles in a Magnetic Fluid in an Inhomogeneous Magnetic Field
by Evgeniy Sokolov, Dariya Kaluzhnaya, Elena Shel’deshova and Petr Ryapolov
Fluids 2023, 8(1), 2; https://doi.org/10.3390/fluids8010002 - 21 Dec 2022
Cited by 2 | Viewed by 1594
Abstract
This work proposes a new technique for creating active bubbles and droplets with a non-magnetic core and a coating formed by a magnetic fluid. The procedure consists of the injection of a non-magnetic phase into a magnetic one that is supported by the [...] Read more.
This work proposes a new technique for creating active bubbles and droplets with a non-magnetic core and a coating formed by a magnetic fluid. The procedure consists of the injection of a non-magnetic phase into a magnetic one that is supported by the presence of an inhomogeneous magnetic field from the source, which combines an annular magnet and an electromagnet. We explored various modes leading to different active bubbles and drops as well as the influence of the magnetic field on the size, velocity, and acceleration of the formed active droplets. It is shown that active bubbles change their trajectory under the action of a constant magnetic field and also disintegrate under the action of a pulsed one. This provides a new mechanism for controlling the absorption of droplets and bubbles using a magnetic field. Therefore, these results can be applied to create droplet-based microfluidics systems, in which an inhomogeneous magnetic field can be used for focusing droplet and bubble flows in a magnetic fluid. Full article
(This article belongs to the Special Issue Recent Advances in Hydrodynamics and Magnetised Fluids)
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