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Title: Optimal ferrofluids for magnetic cooling devices
Authors: Pattanaik, M. S.
Varma, Vijaykumar Babulalji
Cheekati, S. K.
Chaudhary, Varun
Ramanujan, Raju V.
Keywords: Engineering::Materials
Issue Date: 2021
Source: Pattanaik, M. S., Varma, V. B., Cheekati, S. K., Chaudhary, V. & Ramanujan, R. V. (2021). Optimal ferrofluids for magnetic cooling devices. Scientific Reports, 11(1), 24167-.
Journal: Scientific Reports 
Abstract: Superior passive cooling technologies are urgently required to tackle device overheating, consequent performance degradation, and service life reduction. Magnetic cooling, governed by the thermomagnetic convection of a ferrofluid, is a promising emerging passive heat transfer technology to meet these challenges. Hence, we studied the performance metrics, non-dimensional parameters, and thermomagnetic cooling performance of various ferrite and metal-based ferrofluids. The magnetic pressure, friction factor, power transfer, and exergy loss were determined to predict the performance of such cooling devices. We also investigated the significance of the magnetic properties of the nanoparticles used in the ferrofluid on cooling performance. γ-Fe2O3, Fe3O4, and CoFe2O4 nanoparticles exhibited superior cooling performance among ferrite-based ferrofluids. FeCo nanoparticles had the best cooling performance for the case of metallic ferrofluids. The saturation magnetization of the magnetic nanoparticles is found to be a significant parameter to enhance heat transfer and heat load cooling. These results can be used to select the optimum magnetic nanoparticle-based ferrofluid for a specific magnetic cooling device application.
ISSN: 2045-2322
DOI: 10.1038/s41598-021-03514-2
Schools: School of Materials Science and Engineering 
Organisations: Campus for Research Excellence and Technological Enterprise (CREATE) 
Rights: © 2021 The Author(s). This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:MSE Journal Articles

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