Enhanced pool boiling of ethanol on wettability-patterned surfaces

Biao Shen, Takeshi Hamazaki, Wei Ma, Naoki Iwata, Sumitomo Hidaka, Atsushi Takahara, Koji Takahashi, Yasuyuki Takata

研究成果: ジャーナルへの寄稿記事

3 引用 (Scopus)

抄録

Due to the considerably reduced boiling point, organic fluids such as ethanol provide an attractive alternative to water as the working fluid in two-phase thermal management systems for high-heat-flux applications. The state-of-the-art enhancement methods for ethanol boiling normally involve surface structure engineering. Here we report, for the first time, enhancement of nucleate boiling of ethanol using wettability-patterned surfaces. By depositing onto a polished copper surface an array of circular spots of superamphiphobic coating of modified halloysite nanotubes (HNT) with fluoropolymer, which was shown to repel low-surface-tension fluids, we managed to create a meaningful biphilic pattern of alternating hydrophobicity (with ethanol contact angle exceeding 100°) and hydrophilicity (with contact angle close to 0°) on the surface. Boiling heat transfer was found to be improved dramatically on the coated surface. Specifically, the onset of nucleate boiling was found to drop by more than 35%. Moreover, at 20 K surface superheat (above the boiling point), a maximum heat transfer enhancement over 300% compared with a plain copper surface occurred on the surface with a pitch-to-spot ratio close to 2.5. The significantly increased heat transfer rate of the biphilic surfaces could be attributed to facilitated bubble nucleation and stronger agitation effect.

元の言語英語
ページ(範囲)325-331
ページ数7
ジャーナルApplied Thermal Engineering
149
DOI
出版物ステータス出版済み - 2 25 2019

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Boiling liquids
Wetting
Ethanol
Nucleate boiling
Boiling point
Heat transfer
Contact angle
Fluids
Copper
Fluorine containing polymers
Hydrophilicity
Hydrophobicity
Temperature control
Surface structure
Nanotubes
Surface tension
Heat flux
Nucleation
Coatings
Water

All Science Journal Classification (ASJC) codes

  • Energy Engineering and Power Technology
  • Industrial and Manufacturing Engineering

これを引用

Enhanced pool boiling of ethanol on wettability-patterned surfaces. / Shen, Biao; Hamazaki, Takeshi; Ma, Wei; Iwata, Naoki; Hidaka, Sumitomo; Takahara, Atsushi; Takahashi, Koji; Takata, Yasuyuki.

:: Applied Thermal Engineering, 巻 149, 25.02.2019, p. 325-331.

研究成果: ジャーナルへの寄稿記事

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AU - Ma, Wei

AU - Iwata, Naoki

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AU - Takahara, Atsushi

AU - Takahashi, Koji

AU - Takata, Yasuyuki

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