Numerical Exploration of Ferrofluid Magnetic Refrigeration based on Convection Principles

Evthimios C.J. Karaliolios, Daniel De La Cuesta De Cal, Mina Shahi

    Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

    Abstract

    Magnetic refrigeration is identified as a candidate to replace the dominant vapor compression cycle. To maximize the surface area of the magnetocaloric material, ferrofluids are useful and can be used simultaneously as refrigerant and heat source. Additionally, a combination with convection principles is sought to establish a self-pumping system. After validation of the numerical model, a linear gradient magnetic field Bmax of 1.5 T is applied over a 2D horizontal concentric annulus with L/D-ratio = 0.125. Bulk fluid assumption is used to predict the adiabatic temperature rise Tad in the Gadolinium - kerosene ferrofluid. A linear behavior is found for Tad, with Tad,max being 0.32 K for a volume fraction of 5%. Simulations show that thermomagnetic convection is the dominant principle as it strongly outweighs natural convection. This is underlined by the reformulated magnetic Rayleigh number, which is a factor 105 larger than the Rayleigh number.

    Original languageEnglish
    Title of host publicationThermag 2018 - 8th International Conference on Caloric Cooling
    PublisherInternational Institute of Refrigeration
    Pages132-136
    Number of pages5
    ISBN (Electronic)9782362150289
    DOIs
    Publication statusPublished - 1 Jan 2018
    Event8th International Conference on Caloric Cooling, Thermag 2018 - Darmstadt, Germany
    Duration: 16 Sep 201820 Sep 2018
    Conference number: 8
    http://thermag2018.de/

    Conference

    Conference8th International Conference on Caloric Cooling, Thermag 2018
    Abbreviated titleThermag 2018
    CountryGermany
    CityDarmstadt
    Period16/09/1820/09/18
    Internet address

    Fingerprint

    Magnetic refrigeration
    Magnetic fluids
    ferrofluids
    Rayleigh number
    convection
    kerosene
    Gadolinium
    refrigerants
    Kerosene
    annuli
    Refrigerants
    gadolinium
    heat sources
    Natural convection
    free convection
    Numerical models
    Volume fraction
    pumping
    Vapors
    vapors

    Keywords

    • Adiabatic Temperature Rise
    • Convection
    • Ferrofluid
    • Kelvin Body Force
    • Magnetic
    • Magnetic Rayleigh Number.
    • Magnetocaloric Effect
    • Natural
    • Refrigeration
    • Thermomagnetic

    Cite this

    Karaliolios, E. C. J., De La Cuesta De Cal, D., & Shahi, M. (2018). Numerical Exploration of Ferrofluid Magnetic Refrigeration based on Convection Principles. In Thermag 2018 - 8th International Conference on Caloric Cooling (pp. 132-136). [21] International Institute of Refrigeration. https://doi.org/10.18462/iir.thermag.2018.0021
    Karaliolios, Evthimios C.J. ; De La Cuesta De Cal, Daniel ; Shahi, Mina. / Numerical Exploration of Ferrofluid Magnetic Refrigeration based on Convection Principles. Thermag 2018 - 8th International Conference on Caloric Cooling. International Institute of Refrigeration, 2018. pp. 132-136
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    title = "Numerical Exploration of Ferrofluid Magnetic Refrigeration based on Convection Principles",
    abstract = "Magnetic refrigeration is identified as a candidate to replace the dominant vapor compression cycle. To maximize the surface area of the magnetocaloric material, ferrofluids are useful and can be used simultaneously as refrigerant and heat source. Additionally, a combination with convection principles is sought to establish a self-pumping system. After validation of the numerical model, a linear gradient magnetic field Bmax of 1.5 T is applied over a 2D horizontal concentric annulus with L/D-ratio = 0.125. Bulk fluid assumption is used to predict the adiabatic temperature rise Tad in the Gadolinium - kerosene ferrofluid. A linear behavior is found for Tad, with Tad,max being 0.32 K for a volume fraction of 5{\%}. Simulations show that thermomagnetic convection is the dominant principle as it strongly outweighs natural convection. This is underlined by the reformulated magnetic Rayleigh number, which is a factor 105 larger than the Rayleigh number.",
    keywords = "Adiabatic Temperature Rise, Convection, Ferrofluid, Kelvin Body Force, Magnetic, Magnetic Rayleigh Number., Magnetocaloric Effect, Natural, Refrigeration, Thermomagnetic",
    author = "Karaliolios, {Evthimios C.J.} and {De La Cuesta De Cal}, Daniel and Mina Shahi",
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    Karaliolios, ECJ, De La Cuesta De Cal, D & Shahi, M 2018, Numerical Exploration of Ferrofluid Magnetic Refrigeration based on Convection Principles. in Thermag 2018 - 8th International Conference on Caloric Cooling., 21, International Institute of Refrigeration, pp. 132-136, 8th International Conference on Caloric Cooling, Thermag 2018, Darmstadt, Germany, 16/09/18. https://doi.org/10.18462/iir.thermag.2018.0021

    Numerical Exploration of Ferrofluid Magnetic Refrigeration based on Convection Principles. / Karaliolios, Evthimios C.J.; De La Cuesta De Cal, Daniel; Shahi, Mina.

    Thermag 2018 - 8th International Conference on Caloric Cooling. International Institute of Refrigeration, 2018. p. 132-136 21.

    Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

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    N2 - Magnetic refrigeration is identified as a candidate to replace the dominant vapor compression cycle. To maximize the surface area of the magnetocaloric material, ferrofluids are useful and can be used simultaneously as refrigerant and heat source. Additionally, a combination with convection principles is sought to establish a self-pumping system. After validation of the numerical model, a linear gradient magnetic field Bmax of 1.5 T is applied over a 2D horizontal concentric annulus with L/D-ratio = 0.125. Bulk fluid assumption is used to predict the adiabatic temperature rise Tad in the Gadolinium - kerosene ferrofluid. A linear behavior is found for Tad, with Tad,max being 0.32 K for a volume fraction of 5%. Simulations show that thermomagnetic convection is the dominant principle as it strongly outweighs natural convection. This is underlined by the reformulated magnetic Rayleigh number, which is a factor 105 larger than the Rayleigh number.

    AB - Magnetic refrigeration is identified as a candidate to replace the dominant vapor compression cycle. To maximize the surface area of the magnetocaloric material, ferrofluids are useful and can be used simultaneously as refrigerant and heat source. Additionally, a combination with convection principles is sought to establish a self-pumping system. After validation of the numerical model, a linear gradient magnetic field Bmax of 1.5 T is applied over a 2D horizontal concentric annulus with L/D-ratio = 0.125. Bulk fluid assumption is used to predict the adiabatic temperature rise Tad in the Gadolinium - kerosene ferrofluid. A linear behavior is found for Tad, with Tad,max being 0.32 K for a volume fraction of 5%. Simulations show that thermomagnetic convection is the dominant principle as it strongly outweighs natural convection. This is underlined by the reformulated magnetic Rayleigh number, which is a factor 105 larger than the Rayleigh number.

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    Karaliolios ECJ, De La Cuesta De Cal D, Shahi M. Numerical Exploration of Ferrofluid Magnetic Refrigeration based on Convection Principles. In Thermag 2018 - 8th International Conference on Caloric Cooling. International Institute of Refrigeration. 2018. p. 132-136. 21 https://doi.org/10.18462/iir.thermag.2018.0021