Bubble behavior in magnetic fluid under a nonuniform magnetic field

Ishimoto, Jun

doi:10.1016/s0301-9322(97)88474-1

Cited by 8 publications

(8 citation statements)

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“…The decrease in gas bubble radius and increase slip ratio in a strong magnetic field due to the magnetic body force. The results for CNG's bubble were agreement for the experimental results of Ishimoto et al (1995). …”

Section: Effect Of Magnetic Field (Ha) On the Momentum Transfer Coeffsupporting

confidence: 84%

Mathematical Modeling of the Flow of Diesel-CNG Fuel Mixture in a Pipe under the Influence of a Magnetic Field

Wahhab¹,

Aziz²,

Al-Kayiem³

et al. 2017

JAFM

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Horizontal bubbly flow is encountered in various gas and oil facilities and industrial systems. Bubbly flow is characterized by the ability to provide large interfacial areas for heat and mass transfer. Nonetheless, horizontal bubbly flow orientation has received less attention when compared to vertical bubbly flow. This paper presents development of mathematical model and discusses the results obtained from the simulation of hydro-magnetic flow of Diesel-CNG fuel mixture in a horizontal pipe, as predicted by the developed model. The fundamental equations of unsteady, two-phase liquid-gas under an imposed magnetic field were derived and presented. Derivation procedure of the velocity distribution of the liquid and gas phases and the inverse Stokes' number of a bubbly flow are presented. These governing nonlinear partial-differential equations have been solved numerically using a Fourier-Bessel series. Results obtained from the model solution show that the axial velocities of liquid and gas, in laminar flow, have decreased and the slip ratio has increased with the increase of the magnetic field intensity. While, the magnetic field parameter, Ha increased the probability of decreasing the bubbles radii and increasing the bubbles number (n.Rb).

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Section: Effect Of Magnetic Field (Ha) On the Momentum Transfer Coeffsupporting

confidence: 84%

Mathematical Modeling of the Flow of Diesel-CNG Fuel Mixture in a Pipe under the Influence of a Magnetic Field

Wahhab¹,

Aziz²,

Al-Kayiem³

et al. 2017

JAFM

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“…Since a pioneering research of energy conversion using TSMF was originally conducted by Resler and Rosensweig, 2 much efforts have been devoted to the investigation of flow characteristics of TSMF for achieving perfect energy conversion devices. 3–11 As an advantage of the heat transport medium utilizing the TSMF, the structure of the heat exchanger can be drastically simplified and the heat transport apparatus can be modified and downsized in view of actual application for developing a new conventional energy transporting devices. However, previous studies so far reported have revealed that the driving force of TSMF and the heat transporting capacity are too small to meet industrial requirement, when the heat transport device utilizes the only temperature-sensitive magnetization characteristic.…”

Section: Introductionmentioning

confidence: 99%

Development of magnetically-driven cooling device with concentric pipe structure

Yamaguchi

Yamasaki

Bessho

2019

Proceedings of the Institution of Mechanical Engineers, Part C:

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Temperature-sensitive magnetic fluid is a smart material for energy carrier. The most interesting aspect of temperature-sensitive magnetic fluid is that the thermal flow behavior is actively controlled by means of magnetic field. Based on the effect of the temperature-dependent magnetization, temperature-sensitive magnetic fluid can be utilized as an energy conversion system, which can automatically transfer the thermal energy. The advantage in the engineering application can be derived from the fact that there would be entirely no external energy consumption, with which large amount heat can be transported for a long distance without any external power consumption. Taking into account of the advantage, a magnetically-driven cooling device is newly designed for recovering of low- to high-temperature waste heat in the present study. The basic performance of the cooling device with concentric pipe structure is investigated experimentally and data gained in the device is examined in detail in view of magneto-hydrodynamics. In the present study, electromagnet is used as an external magnetic field for the purpose of investigating basic heat transfer characteristics of the present experimental device, so that the magnetic field can be continuously altered. However, it can be easily replaced to a permanent for the practical device without additional electrical energy. The results show that the binary temperature-sensitive magnetic fluid can be circulated freely with a high flow rate of 2.0 × 10−3 m3/min by imposing the magnetic field of 55.8 kA/m. It is found that the newly designed device can transfer thermal energy more than 250 W with overall system efficiency of 11.0% at air temperature of 623 K.

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“…As an alternative to high-energy X-ray imaging, thin-film configurations of ferrofluid have been employed to investigate the formation of clusters of the magnetic nanoparticles [11][12][13][14] as well as the shapes of bubbles [15][16][17]. Thin-film systems are, however, subject to wall effects [18,19], so the relevance of such studies to bulk ferrofluid systems is not clear.…”

Section: Introductionmentioning

confidence: 99%

Flow Anisotropy due to Thread-Like Nanoparticle Agglomerations in Dilute Ferrofluids

Cali

Lee

Trubatch

et al. 2017

Fluids

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Improved knowledge of the magnetic field dependent flow properties of nanoparticle-based magnetic fluids is critical to the design of biomedical applications, including drug delivery and cell sorting. To probe the rheology of ferrofluid on a sub-millimeter scale, we examine the paths of 550 µm diameter glass spheres falling due to gravity in dilute ferrofluid, imposing a uniform magnetic field at an angle with respect to the vertical. Visualization of the spheres' trajectories is achieved using high resolution X-ray phase-contrast imaging, allowing measurement of a terminal velocity while simultaneously revealing the formation of an array of long thread-like accumulations of magnetic nanoparticles. Drag on the sphere is largest when the applied field is normal to the path of the falling sphere, and smallest when the field and trajectory are aligned. A Stokes drag-based analysis is performed to extract an empirical tensorial viscosity from the data. We propose an approximate physical model for the observed anisotropic drag, based on the resistive force theory drag acting on a fixed non-interacting array of slender threads, aligned parallel to the magnetic field.

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Bubble behavior in magnetic fluid under a nonuniform magnetic field

Cited by 8 publications

References 0 publications

Mathematical Modeling of the Flow of Diesel-CNG Fuel Mixture in a Pipe under the Influence of a Magnetic Field

Mathematical Modeling of the Flow of Diesel-CNG Fuel Mixture in a Pipe under the Influence of a Magnetic Field

Development of magnetically-driven cooling device with concentric pipe structure

Flow Anisotropy due to Thread-Like Nanoparticle Agglomerations in Dilute Ferrofluids

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