Pool boiling performance of HFE-7100 on hierarchically structured surfaces

Author(s)

dos Santos Filho, Erivelto ^[1] ; Kiyomura, Igor Seicho ^{[2, 3]} ; de Andrade, Bruno Alves ^[2] ; Cardoso, Elaine Maria ^{[2, 4]}

Affiliation

^[1] Univ Sao Paulo, Sao Carlos Sch Engn EESC, Dept Mech Engn, Heat Transfer Res Grp, Av Trabalhador Sao Carlense 400, BR-13566590 Sao Carlos, SP - Brazil

^[2] UNESP Sao Paulo State Univ, Sch Engn, Postgrad Program Mech Engn, Av Brasil 56, BR-15385000 Ilha Solteira, SP - Brazil

^[3] UNIGRAN Ctr Univ Grande Dourados, Balbina Matos 2121, BR-79824900 Dourados, MS - Brazil

^[4] UNESP Sao Paulo State Univ, Campus Sao Joao da Boa Vista, Sao Joao Da Boa Vista - Brazil

• Document type: Journal article
• Source: CASE STUDIES IN THERMAL ENGINEERING; v. 28, DEC 2021.
• Web of Science Citations: 0

Abstract

The evolution of the processes for modifying/manufacturing surfaces has facilitated the advancement in pool boiling research with surfaces capable of increasing the heat transfer coefficient (HTC) and the critical heat flux (CHF) through micro/nanostructures heating surfaces. The hybrid processes, which associate the removal or addition of material for the formation of microstructures followed by the addition of material for nanostructure formation, combine the benefits achieved with different intensification techniques in search of superior performance in boiling heat transfer. The thermal performance of pool boiling on surfaces with a combination of microfins and nanostructured surfaces, through nanoparticle deposition, was studied by using HFE-7100 at saturated conditions. The microtextured surfaces were nanostructured by boiling alumina nanofluid with 0.0007 vol%, applying a fixed heat flux of 500 kW/m(2). The experimental boiling tests on hierarchical surfaces indicate a significant enhancement in the HTC (up to 65% compared to the microtextured surfaces) due to improved density of nucleation site and vapor bubble dynamics. The maximum heat flux corresponds to the maximum experimental heat transfer coefficient; the nanoparticle deposition on microtextured surfaces enhances the liquid absorption capacity, improving the surface's rewetting and delaying the dryout occurrence. (AU)

• FAPESP's process: 17/04276-1 - Pool boiling heat transfer on hierarchically nanostructured surfaces
• Grantee: Isabela Ignácio da Silva
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• FAPESP's process: 14/19497-5 - Theoretical and experimental study of influence of nanofluid on the nucleate boiling regime
• Grantee: Leonardo Lachi Manetti
• Support Opportunities: Scholarships in Brazil - Master
• FAPESP's process: 14/07949-9 - Effect of nano and micro structure surfaces on nucleate boiling
• Grantee: Igor Seicho Kiyomura
• Support Opportunities: Scholarships in Brazil - Master
• FAPESP's process: 19/02566-8 - Hydrodynamic and thermal characteristics of single and two-phase flow in micro pin fin heat sinks
• Grantee: Elaine Maria Cardoso
• Support Opportunities: Regular Research Grants
• FAPESP's process: 13/15431-7 - Application of nanotechnology in thermal processes and energy conversion
• Grantee: Elaine Maria Cardoso
• Support Opportunities: Research Grants - Young Investigators Grants