Experimental study on heat transfer of the magnetorheological fluids

Yıldırım, Gökhan; Genç, Seval

doi:10.1088/0964-1726/22/8/085001

Cited by 29 publications

(24 citation statements)

References 14 publications

(23 reference statements)

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“…The finding was experimentally done by Yildirim and Genc [3] in which the thermal conductivity of MR fluid increased along with increasing magnetic field. This behaviour is attributed to the formation of chain-like structures by the magnetic particles when subjected to magnetic field, which provide high conductivity heat transfer paths [4].…”

Section: Introductionmentioning

confidence: 81%

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Magnetic field simulation of a thermal conductivity measurement instrument for magnetorheological fluid

et al. 2016

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Abstract. Technological advancements in thermal systems demand an innovative heat dissipation technology. Magnetorheological (MR) fluid has a huge potential to solve the problem. However, characterising thermal conductivity of the materials in magnetic fields required tailored instruments. This paper presents a concept design of the MR fluids thermal conductivity measurement instrument. The developed instrument was designed to be able to measure thermal conductivity in both parallel and perpendicular orientations with magnetic field. Magnetic fields distribution of the proposed concept design was analysed using finite element method for magnetics. Design modification then conducted to improve the magnetic fields strength. Findings of this study showed that gap thickness played a significant factor in determining the optimal design. Simulated magnetic fields strength at both parallel and perpendicular orientations were found identical, yet varied in distributions.

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Section: Introductionmentioning

confidence: 81%

“…This modification is beyond requirement of the standard. This method has also been applied in previous research [3,10,11].…”

Section: Design Methodologymentioning

confidence: 99%

Magnetic field simulation of a thermal conductivity measurement instrument for magnetorheological fluid

et al. 2016

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“…This behavior can be explained considering the well known effects of temperature on the torque transmission characteristic of an MRF-based clutch [12][13][14]. In fact, since the relative speed between the two shafts increases the work dissipated inside the device, the self-produced heat increases the temperature of the fluid and a loss of torque can be experienced.…”

Section: Experimental Characterization Of the Clutchmentioning

confidence: 99%

An innovative multi-gap clutch based on magneto-rheological fluids and electrodynamic effects: magnetic design and experimental characterization

Rizzo

2016

Smart Mater. Struct.

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In this paper an innovative multi-gap magnetorheological clutch is described. It is inspired by a device previously developed by the author’s research group and contains a novel solution based on electrodynamic effects, capable to considerably improve the transmissible torque during the engagement phase. Since this (transient) phase is characterized by a non-zero angular speed between the two clutch shafts, the rotation of a permanent magnets system, used to excite the fluid, induces eddy currents on some conductive material strategically positioned in the device. As a consequence, an electromagnetic torque is produced which is added to the torque transmitted by the magnetorheological fluid only. Once the clutch is completely engaged and the relative speed between the two shafts is zero, the electrodynamic effects vanish and the device operates like a conventional magnetorheological clutch. The system is investigated and designed by means a 3D FEM model and the performance of the device is experimentally validated on a prototype.

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“…The rectification factor is rather low for these fluids to be efficiently applied as thermal rectificators with an anisotropic, electric field [141], or magnetic field [140,[142][143][144] dependent thermal conductivity.…”

Section: Mr or Er Thermal Diode That Applies The Anisotropy Of Thermamentioning

confidence: 99%

Special Heat Transfer Mechanisms: Active and Passive Thermal Diodes

Kitanovski

Tušek

Tomc

et al. 2014

Magnetocaloric Energy Conversion

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Many types of systems and devices require specific thermal management. For example, they can operate in such a manner that a rapid redirection of the heat flux or its intensity is required. This relates to different kinds of electronic devices, sensors, actuators, energy conversion devices, as well as some emerging technologies. The latter include ferroic energy conversion technologies based on magnetocaloric, electrocaloric, elastocaloric and other effects related to solid-state physics. With certain new design ideas it is perhaps even possible to reconsider existing systems and devices, which apply heat regenerators or require periodic heat-flux variations (i.e. Stirling devices).This chapter presents mechanisms and devices that can be applied as solid-state and (micro)fluidic thermal diodes. The thermal diode (heat "semiconductor", thermal switch, heat valve, thermal rectifier) is a physical phenomenon, mechanism or device in which it is possible to manipulate and control the direction of the heat flux and sometimes also the intensity of the heat flux. In this chapter the characteristics of such thermal diodes are described and presented with respect to different potential applications.A careful reader of this book will realize that the application of thermal diode mechanisms can be crucial for the future development of ferroic solid-state technologies. Conventional heat transfer mechanisms, such as heat convection, are too limited by the heat transfer surface and the properties of the working fluid. In order to boost the power density of the magnetocaloric device by one order of magnitude or more, a different research direction is required that may take us out of the scope of the familiar and conventional active magnetic regeneration, which is actually based on heat convection. One solution is the introduction of thermal diode mechanisms. These can also lead to the design and construction of a new and advanced generation of magnetocaloric energy conversion or other ferroic (e.g., electrocaloric) devices.

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Experimental study on heat transfer of the magnetorheological fluids

Cited by 29 publications

References 14 publications

Magnetic field simulation of a thermal conductivity measurement instrument for magnetorheological fluid

Magnetic field simulation of a thermal conductivity measurement instrument for magnetorheological fluid

An innovative multi-gap clutch based on magneto-rheological fluids and electrodynamic effects: magnetic design and experimental characterization

Special Heat Transfer Mechanisms: Active and Passive Thermal Diodes

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