Author(s): Manetti, Leonardo Lachi [UNESP] ; Gherhardt, Ribatski ; Souza, Reinaldo Rodrigues de ; Cardoso, Elaine Maria [UNESP]
Date: 2020
Persistent ID: http://hdl.handle.net/11449/194527
Origin: Oasisbr
Subject(s): Pool boiling; metal foam; HFE-7100; porous surface; immersion cooling; Pool boiling; Pool boiling; metal foam; metal foam; HFE-7100; HFE-7100; porous surface; porous surface; immersion cooling; immersion cooling
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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
The search for new techniques to increase boiling heat transfer has been driven by more efficient and compact heat exchangers, especially in microelectronics and equipment with high thermal loads. Two-phase cooling systems are a promising thermal management technology for high-heat dissipation. In this context, the present study investigated the performance of modified heating surfaces consisting of metal foams of nickel (Ni) and copper (Cu). Pool boiling tests were performed using HFE-7100 as working fluid, at saturation conditions. The metal foams surfaces provided a higher heat transfer coefficient compared to plain surfaces and prevented thermal overshoot at the onset nucleate boiling. The Cu foam provided the best performance for the entire boiling curve. In general, for low and moderated heat fluxes, there is a combined effect of surface area and thermal conductivity of foams; the high surface area of Ni foam provides a barrier for the departure of the vapor bubble, inhibiting the cooling effect of the heating surface. For the Cu foam, no significant vapor trapped effect was observed, and the highest heat transfer coefficient was 12.4 kW/m²∙K for a heat flux around 270 kW/m²; in addition, the thermal behavior is a function of the permeability and wickability behaviors of the surfaces.
Preprint
UNESP - Universidade Estadual Paulista, Faculdade de Engenharia de Ilha Solteira, Programa de Pós-graduação em Engenharia Mecânica
USP - Universidade de São Paulo, Escola de Engenharia de São Carlos, Departamento de Engenharia Mecânica
CNPq: 458702/2014-5
FAPESP: 2013/15431-7
FAPESP: 2017/13813-0
FAPESP: 2019/02566-8
