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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

A Method for Measuring Contact Angle and the Influence of Surface-Fluid Parameters on the Boiling Heat Transfer Performance

Texto completo
Autor(es):
da Cunha, Alex P. [1] ; Mogaji, Taye S. [2] ; de Souza, Reinaldo R. [1] ; Cardoso, Elaine M. [1]
Número total de Autores: 4
Afiliação do(s) autor(es):
[1] Sao Paulo State Univ UNESP, Sch Nat Sci & Engn, Av Brasil 56, BR-15385000 Ilha Solteira, SP - Brazil
[2] Fed Univ Technol Akure FUTA, Sch Engn & Engn Technol, Dept Mech Engn, PMB 704, Akure, Ondo State - Nigeria
Número total de Afiliações: 2
Tipo de documento: Artigo Científico
Fonte: JOURNAL OF HEAT TRANSFER-TRANSACTIONS OF THE ASME; v. 142, n. 9 SEP 1 2020.
Citações Web of Science: 0
Resumo

An experimental apparatus and a computational routine were developed and implemented in order to obtain the sessile drop images and the contact angle measurement for different fluids and surface conditions. Moreover, experimental results of heat transfer coefficients (HTCs) during pool boiling of de-ionized water (DI water), Al2O3-DI water- and Fe2O3-DI water-based nanofluids are presented in this paper. Based on these results, the effect of surface roughness and nanofluid concentration on the surface wettability, contact angle, and the heat transfer coefficient was analyzed. The experiments were performed on copper heating surfaces with different roughness values (corresponding to a smooth surface or a rough surface). The coated surfaces were produced by the nanofluid pool boiling process at two different volumetric concentrations. All surfaces were subjected to metallographic, wettability and roughness tests. For smooth surfaces, in comparison to DI water, heat transfer enhancement up to 60% is observed for both nanofluids at low concentrations. As the concentration of the nanofluid increases, the surface roughness increases and the contact angle decreases, characterizing a hydrophilic behavior. The analyses indicate that the boiling process of nanofluid leads to the deposition of a coating layer on the surface, which influences the heat transfer performance in two-phase systems. (AU)

Processo FAPESP: 13/15431-7 - Análise da aplicação de nanotecnologia em processos térmicos e de conversão de energia
Beneficiário:Elaine Maria Cardoso
Linha de fomento: Auxílio à Pesquisa - Jovens Pesquisadores
Processo FAPESP: 17/13813-0 - Utilização de superfícies estendidas - espumas metálicas - para intensificação da transferência de calor por ebulição
Beneficiário:Leonardo Lachi Manetti
Linha de fomento: Bolsas no Brasil - Doutorado
Processo FAPESP: 19/02566-8 - Caracterização experimental do desempenho térmico e hidrodinâmico de dissipadores de calor microaletados durante a ebulição convectiva
Beneficiário:Elaine Maria Cardoso
Linha de fomento: Auxílio à Pesquisa - Regular