An analysis of the effects of nanoparticles deposition on characteristics of the heating surface and ON pool boiling of water

Autor(es)

Kiyomura, I. S. ; Manetti, L. L. ; da Cunha, A. P. ; Ribatski, G. ; Cardoso, E. M.

• Tipo de documento: Artigo Científico
• Fonte: INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER; v. 106, p. 666-674, MAR 2017.
• Citações Web of Science: 16

Resumo

Nanofluid pool boiling can modify the morphology of the heating surface and the physical properties of the base fluids, interfering directly on the vapor bubbles dynamics and on the heat transfer mechanisms. This paper concerns an experimental investigation of the effects of surface roughness and nanoparticle deposition on the contact angle, surface wettability and pool boiling heat transfer coefficient (HTC). Experiments were carried out using copper surfaces with different roughnesses, and deionized water as the working fluid at a pressure of 98 kPa and under saturated conditions. The nanostructured surfaces were produced by maghemite nanoparticle deposition, which is achieved by boiling selected mass concentrations of a Fe2O3-deionized water nanofluid (0.029 g/l and 0.29 g/l, corresponding to low and high nanofluid concentration, respectively). The highest heat transfer coefficients were obtained for the smooth surface with deposition of nanoparticles at low mass concentrations. In addition, as the nanofluid concentration increases the surface roughness also increases, and the higher the nanofluid concentration, the lower the contact angle of water on the coated surface. (C) 2016 Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 13/15431-7 - Análise da aplicação de nanotecnologia em processos térmicos e de conversão de energia
• Beneficiário: Elaine Maria Cardoso
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores
• Processo FAPESP: 14/07949-9 - Efeito das superfícies nano e micro estruturadas sobre a ebulição nucleada
• Beneficiário: Igor Seicho Kiyomura
• Modalidade de apoio: Bolsas no Brasil - Mestrado
• Processo FAPESP: 14/19497-5 - Estudo teórico e experimental da Influência de nanofluidos sobre a ebulição nucleada
• Beneficiário: Leonardo Lachi Manetti
• Modalidade de apoio: Bolsas no Brasil - Mestrado