Pool boiling enhancement using switchable polymers coating

Bertossi, Rémi; Caney, Nadia; Gruss, Jean-Antoine; Poncelet, Olivier

doi:10.1016/j.applthermaleng.2014.11.061

Cited by 43 publications

(11 citation statements)

References 9 publications

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“…When the temperature increases from less than LCST to more than LCST, the surface wettability changes from hydrophilic to hydrophobic. Bertossi et al (2015) reported that the experimental results validate the assumption that polymers coating surface enhance heat transfer in nucleate boiling conditions. The transition of the hydrophilic and hydrophobic state of the polymers coating surface promotes the bubble formation (hydrophobic surface) and bubble departure (hydrophilic surface).…”

Section: Intelligent Wettability Surfaces With Adaptive Functionssupporting

confidence: 68%

Recent Advances of Surface Wettability Effect on Flow Boiling Heat Transfer Performance

Cao¹,

Yang²,

Zhao³

et al. 2022

Frontiers in Heat and Mass Transfer

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Section: Intelligent Wettability Surfaces With Adaptive Functionssupporting

confidence: 68%

Recent Advances of Surface Wettability Effect on Flow Boiling Heat Transfer Performance

Cao¹,

Yang²,

Zhao³

et al. 2022

Frontiers in Heat and Mass Transfer

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“…A desire to increase the HTC and the CHF has led to the development of many new techniques over the past few decades [6]. In pool boiling, these techniques are generally based on tailoring the surface and include combinations of micropores, nanopores and tunnels [7,8]; fins [9,10]; nanowires and nanotubes [4,11,12]; hydrophobic and hydrophilic surfaces and patterns [13][14][15][16]; and the use of nanofluids as a working fluid [17].…”

Section: Introductionmentioning

confidence: 99%

Enhanced pool-boiling heat transfer on laser-made hydrophobic/superhydrophilic polydimethylsiloxane-silica patterned surfaces

Zupančič

Steinbücher

Gregorčič

et al. 2015

Applied Thermal Engineering

136

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This study presents the application of hydrophobic polydimethylsiloxane-silica coating used for the development of biphilic surfaces that are designed to enhance the heat transfer during boiling. Surface analyses showed that this coating exhibits a high hydrophobicity due to its hierarchical structure and the use of hydrophobic polymer. An appropriate thermal treatment leads to the oxidation of the methyl groups and a formation of silicon oxide and silicon carbide that result in a wettability transition from hydrophobic to superhydrophilic. On this basis, we manufactured hydrophobic/superhydrophilic patterns on stainless-steel foils using a pulsed Nd:YAG laser. The uniform, superhydrophilic surface exhibited a 350% larger critical heat flux (CHF) than bare stainless-steel foil. High-speed IR thermography revealed that the increased wettability reduced the bubble contact diameter, allowed a higher density of active nucleation sites, and delayed the dry-out. The biphilic surfaces with differently sized hydrophobic spots exhibited the highest heat transfer coefficients, with an up to 200% higher CHF compared to the bare stainless steel. Smaller hydrophobic spots reduced the bubble diameter and increased the nucleation frequency. However, surfaces with larger hydrophobic regions promoted boiling incipience and exhibited higher heat transfer coefficients at low heat fluxes. These results suggest that the optimal biphilic pattern could only be determined for a particular operating point. Our data provide a new insight into the complex phenomena of nucleate pool boiling on chemically and mechanically heterogeneous surfaces.

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“…Plasma Polymerization offers methods to change the surface geometric and chemistry structures for manipulating the wettability of surfaces (Feng et al, 2002). This ability has motivated many researchers in the field of two-phase heat transfer (Bertossi et al, 2015;Çıkım et al, 2014;Elkholy and Kempers, 2020). Similarly, as mentioned before, C 4 F 8 polymer was used in the fabrication of biphilic surfaces.…”

Section: Sample Preparationmentioning

confidence: 99%

Effect of Surface Biphilicity on FC-72 Flow Boiling in a Rectangular Minichannel

et al. 2021

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Flow boiling is one of the most effective mechanisms in heat transfer thanks to the latent heat of vaporization. Surface modifications such as mixed-wettability have a considerable effect on the boiling heat transfer performance in terms of enhancement in boiling heat transfer as well as critical heat flux. This study introduces a new method of fabrication of biphilic surfaces, where C4F8 (Octafluorocyclobutane) islands are surrounded by silicon. Two different biphilic surfaces were fabricated and compared with the entirely uniform hydrophobic surface taken as a reference,. Each of the biphilic surfaces has three different sections, namely inlet, middle and outlet regions. The first region is mainly hydrophobic (inlet), while the third region is mainly hydrophilic (outlet). The heat transfer coefficients were obtained at different heat fluxes. Compared to the entirely uniform hydrophobic surface, the results show that biphilic surfaces enhance the boiling heat transfer performance by up to 50%. The visualization results revealed that the biphilic surfaces lead to more nucleation sites in the bubbly flow regime and break up the elongated bubbles in the slug flow regime.

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Pool boiling enhancement using switchable polymers coating

Cited by 43 publications

References 9 publications

Recent Advances of Surface Wettability Effect on Flow Boiling Heat Transfer Performance

Recent Advances of Surface Wettability Effect on Flow Boiling Heat Transfer Performance

Enhanced pool-boiling heat transfer on laser-made hydrophobic/superhydrophilic polydimethylsiloxane-silica patterned surfaces

Effect of Surface Biphilicity on FC-72 Flow Boiling in a Rectangular Minichannel

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