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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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.",
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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