Boiling two-phase flows of magnetic fluid in a non-uniform magnetic field

Kamiyama, Satoshi; Ishimoto, Jun

doi:10.1016/0304-8853(95)00354-1

Cited by 41 publications

(10 citation statements)

References 11 publications

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“…The two-phase flow boiling of the magnetic fluid under a nonuniform magnetic field was investigated both theoretically and experimentally. 21 In this study, researchers showed the possibility of flow controlling and stabilizing of two-phase flow boiling by using of a magnetic field. Junhong et al 22 investigated the pool boiling heat transfer of a water-based magnetic fluid, both in the presence of magnetic field and absence of it.…”

Section: The Effect Of Surface Characteristicsmentioning

confidence: 99%

“…They found that the heat transfer increases with increasing field gradient or for dilute fluid. The two‐phase flow boiling of the magnetic fluid under a nonuniform magnetic field was investigated both theoretically and experimentally . In this study, researchers showed the possibility of flow controlling and stabilizing of two‐phase flow boiling by using of a magnetic field.…”

Section: Introductionmentioning

confidence: 99%

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Visualization of pool boiling heat transfer of magnetic nanofluid

Abad

Ebrahimi-Dehshali

Bijarchi

et al. 2019

Heat Trans. Asian Res.

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To increase heat transfer, ferrofluids have been utilized to study the effective parameters of pool boiling. Changes and possible enhancement of pool boiling heat transfer of magnetic fluids is a function of magnetic field and concentration of nanoparticles. To the best knowledge of the authors, no systematic experiments have been conducted to visualize the phenomena during the boiling of ferrofluids with different concentrations. In this study an experimental investigation has been conducted, by designing and fabricating a novel hele‐shaw vessel with glass sides, to explore via visualizations some details in the pool boiling of ferrofluids. Boiling patterns of ferrofluids at various concentrations have been visualized –both in the presence of a constant magnetic field and without any magnetic field. Pure water tests were performed as a baseline, and the experimental program has been conducted at four different concentrations, namely 30, 40, 50, and 500 ppm. The primary focus of the visualization is to study how different concentration of ferrofluid affects the boiling ebullition cycle through a high‐speed camera. The results showed that in the boiling process of ferrofluids with a low concentration (10 to 50 ppm), the rising bubbles lead to enlarge the active nucleation sites and create cavities. The formation of cavities changes the solid layer of the surface to a porous medium and enhances the wettability of the surface and boiling heat transfer coefficient. In the ferrofluid boiling with high concentration (500 ppm), bubbles rising is hindered by nanoparticles.

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Section: The Effect Of Surface Characteristicsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Visualization of pool boiling heat transfer of magnetic nanofluid

Abad

Ebrahimi-Dehshali

Bijarchi

et al. 2019

Heat Trans. Asian Res.

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“…There are two effects induced by two-phase flow, the magnetic force effect and the magnetic electricity effect, and Kamiyama and Ishimoto [ 14 ] proposed a thermal conversion system to enhance the boiling two-phase flow of magnetic fluid under a non-uniform magnetic field. A magnetic repulsion force resulting from the magnetic susceptibility between vapor bubbles and magnetic fluids was used to accelerate the departure of the bubbles.…”

Section: Introductionmentioning

confidence: 99%

Non-Contact Monitoring on the Flow Status inside a Pulsating Heat Pipe

Chen

Zhu

2020

Sensors

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The paper presents a concept of thermal-to-electrical energy conversion by using the oscillatory motion of magnetic fluid slugs which has potential to be applied in the field of sensors. A pulsating heat pipe (PHP) is introduced to produce vapor-magnetic fluid plug–slug flow in a snake-shaped capillary tube. As the magnetic fluid is magnetized by the permanent magnet, the slugs of magnetic fluid passing through the copper coils make the magnetic flux vary and produce the electromotive force. The peak values of induced voltage observed in our tests are from 0.1 mV to 4.4 mV. The effects of the slug velocity, heat input and magnetic particle volume concentration on the electromotive force are discussed. Furthermore, a theoretical model considering the fluid velocity of the working fluid, the inner radius of the PHP and the contact angle between the working fluid and the pipe wall is established. At the same time, the theoretical and experimental results are compared, and the influences of tube inner radius, working fluid velocity and contact angle on the induced electromotive force are analyzed.

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“…Kamiyama and Ishimoto and Liu et al performed experiments to characterize boiling two‐phase flow heat transfer and pool boiling, respectively, using water‐based magnetic fluids. Aihara et al simulated a two‐dimensional flow of a magnetic fluid with a 50% mass concentration of Mn‐Zn ferrite particles in a horizontal circular tube using a single‐phase model and explained the controllability of convective heat transfer in the presence of a non‐uniform magnetic field.…”

Section: Introductionmentioning

confidence: 99%

Euler‐Lagrangian Simulation of Magnetic Field Effects on the Mixed Convection of Ferrofluid

Aminfar

Mohammadpourfard

Eynalvandpour

2013

Heat Trans. Asian Res.

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In this article, the hydro‐thermal behavior of a ferrofluid flow (kerosene and 4 vol% Fe3O4) in a vertical tube in the presence of different magnetic field gradients using a two‐phase Euler–Lagrange model and control volume technique has been reported. Two cases for the magnetic field gradients have been considered to affect the mixed convection of the ferrofluid: non‐uniform axial negative and positive field gradients. Unlike our previous studies instead of uniform nanoparticle distribution within the flow, it has been considered as non‐uniform (maximum concentration profile is at the flow centerline). Based on the obtained results in this case, the velocity profiles in the negative magnetic field gradients are more affected than our previous studies. Also the time variations of the Nusselt number and skin friction factor have been presented. © 2013 Wiley Periodicals, Inc. Heat Trans Asian Res 43(2): 148‐166, 2014; Published online 12 September 2013 in Wiley Online Library (http://wileyonlinelibrary.com/journal/htj). DOI 10.1002/htj.21069

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Boiling two-phase flows of magnetic fluid in a non-uniform magnetic field

Cited by 41 publications

References 11 publications

Visualization of pool boiling heat transfer of magnetic nanofluid

Visualization of pool boiling heat transfer of magnetic nanofluid

Non-Contact Monitoring on the Flow Status inside a Pulsating Heat Pipe

Euler‐Lagrangian Simulation of Magnetic Field Effects on the Mixed Convection of Ferrofluid

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