Bubble dynamics and pool boiling performance on biphilic patterned surfaces

Dong Il Shim, Geehong Choi, Donghwi Lee, Namkyu Lee, Hyung Hee Cho

Research output: Contribution to journalConference article

Abstract

Boiling heat transfer is effective cooling mechanism accompanying phase change phenomena, and it is used in various high heat flux generated systems such as power plant and integrated electronic devices. Bubble dynamics is one of main factors to decide boiling performance such as heat transfer coefficient (HTC) and critical heat flux (CHF). Surface wettability control is an effective method to change bubble dynamics for enhanced boiling heat transfer. In this study, we fabricated various biphilic surfaces which have both hydrophilicity and hydrophobicity. Our strategy is that biphilic patterned surface can activate nucleation, enhance HTC and maximize CHF by preventing bubble merging through ensuring enough pitch between individual bubbles. Dot sizes were strictly controlled from few micrometers to milimeters by photolithography method and hydrophobic chemical coating. Bubble base and departure diameters, activate nucleate sites and frequency were analyzed by 2000 fps high speed camera images. We carried out pool boiling experiments on biphilic multi dots arrays which were designed based on single bubble characteristics. This study demonstrates that the biphilic patterned surface could enhance boiling performance by controlled bubble dynamics. Moreover, we expect that this study provides the strategy for further improvement of high heat flux cooling technology using wettability control.

Original languageEnglish
Pages (from-to)1191-1197
Number of pages7
JournalInternational Heat Transfer Conference
Volume2018-August
Publication statusPublished - 2018 Jan 1
Event16th International Heat Transfer Conference, IHTC 2018 - Beijing, China
Duration: 2018 Aug 102018 Aug 15

Fingerprint

Bubbles (in fluids)
boiling
Boiling liquids
bubbles
Heat flux
heat flux
Heat transfer coefficients
Wetting
wettability
heat transfer coefficients
Heat transfer
Cooling
High speed cameras
Hydrophilicity
heat transfer
Photolithography
Hydrophobicity
Merging
cooling
high speed cameras

All Science Journal Classification (ASJC) codes

  • Fluid Flow and Transfer Processes
  • Condensed Matter Physics
  • Mechanical Engineering

Cite this

Shim, Dong Il ; Choi, Geehong ; Lee, Donghwi ; Lee, Namkyu ; Cho, Hyung Hee. / Bubble dynamics and pool boiling performance on biphilic patterned surfaces. In: International Heat Transfer Conference. 2018 ; Vol. 2018-August. pp. 1191-1197.
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Bubble dynamics and pool boiling performance on biphilic patterned surfaces. / Shim, Dong Il; Choi, Geehong; Lee, Donghwi; Lee, Namkyu; Cho, Hyung Hee.

In: International Heat Transfer Conference, Vol. 2018-August, 01.01.2018, p. 1191-1197.

Research output: Contribution to journalConference article

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AU - Lee, Donghwi

AU - Lee, Namkyu

AU - Cho, Hyung Hee

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