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Numerical, theoretical and experimental investigation on THERMO-MAGNETIC convection

Grant number: 17/05643-8
Support Opportunities:Regular Research Grants
Start date: September 01, 2017
End date: August 31, 2019
Field of knowledge:Engineering - Mechanical Engineering - Transport Phenomena
Principal Investigator:Rafael Gabler Gontijo
Grantee:Rafael Gabler Gontijo
Host Institution: Faculdade de Engenharia Mecânica (FEM). Universidade Estadual de Campinas (UNICAMP). Campinas , SP, Brazil
Associated researchers:Erick de Moraes Franklin ; Francisco Ricardo da Cunha

Abstract

A magnetic fluid is a colloidal liquid-solid suspension, formed by a carrier Newtonian liquidand nanometric particles of ferromagnetic material. The stability of the suspension againstthe formation of particle clustering and consequently sedimentation is achieved through the addition of large molecules of polymeric material. These molecules, adhere to the surfaceof the particles and act as nano-springs that prevent particle clustering. Since the discoveryof these fluids in the 60s, this new class of materials has been used in many interesting applications. These applications go from the development of new tumor treatment techniques(magneto-hyperthermia) to the possibility of cooling electronic devices through a phenomenonknown as thermo-magnetic convection. Different from the classical phenomenon of natural convection, which has been extensively studied since the XIX century, the thermo-magnetic convection occurs when a stratification of magnetic susceptibility induced by a temperaturegradient is combined with the application of an external magnetic field. We estimate that it is possible to increase up to 20% the heat transfer rates inside a thin cavity with only 0.5% of particles (in volume) and an applied field of 300 G. Although this technique may sound very promising, its use to solve practical problems involving heat transfer enhancement still requires a better comprehension on some operational details as well as of the phenomenonological equations that describe this new kind of flow. This work aims to investigate the thermo-magnetic phenomenon from an experimental/operational perspective as well as from a numerical/theoretical point of view, so this knowledge can be used in the development of new technologies applied to the cooling of electronic devices. (AU)

Articles published in Agência FAPESP Newsletter about the research grant:
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Scientific publications (7)
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
DE CARVALHO, DOUGLAS DANIEL; GONTIJO, RAFAEL GABLER. Magnetization diffusion in duct flow: The magnetic entrance length and the interplay between hydrodynamic and magnetic timescales. Physics of Fluids, v. 32, n. 7, . (17/05643-8)
DE CARVALHO, D. D.; GONTIJO, R. G.. Reconstructing a continuous magnetization field based on local vorticity cells, CFD and Langevin dynamics: A new numerical scheme. Journal of Magnetism and Magnetic Materials, v. 514, p. 5-pg., . (17/05643-8)
ALEGRETTI, C. F.; GONTIJO, R. G.. New insights on boundary layer control using magnetic fluids: A numerical study. Journal of Magnetism and Magnetic Materials, v. 514, p. 6-pg., . (17/05643-8)
DE CARVALHO, DOUGLAS DANIEL; CUNHA, FRANCISCO RICARDO; GONTIJO, RAFAEL GABLER. Analysis of magnetic fluid displacement in capillaries. Journal of the Brazilian Society of Mechanical Sciences and Engineering, v. 42, n. 1, . (17/05643-8)