Enhancement of Pool Boiling Heat Transfer Using Aligned Silicon Nanowire Arrays

Dong Il Shim, Geehong Choi, Namkyu Lee, Taehwan Kim, Beom Seok Kim, Hyung Hee Cho

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

Enhancing the critical heat flux (CHF), which is the capacity of heat dissipation, is important to secure high stability in two-phase cooling systems. Coolant supply to a dry hot spot is a major mechanism to prevent surface burn-out for enhancing the CHF. Here, we demonstrate a more ready supply of coolant using aligned silicon nanowires (A-SiNWs), with a high aspect ratio (>10) compared to that of conventional random silicon nanowires (R-SiNWs), which have a disordered arrangement, for additional CHF improvement. We propose the volumetric wicking rate, which represents the coolant supply properties by considering both the liquid supply velocity and the amount of coolant (i.e., wicking coefficient and wetted volume, respectively). Through experimental approaches, we confirm that the CHF is enhanced as the volumetric wicking rate is increased. In good agreement with the fabrication hypothesis, A-SiNWs demonstrate higher coolant supply abilities than those of R-SiNWs. The longest (7 μm) A-SiNWs have the highest volumetric wicking rate (25.11 × 10-3 mm3/s) and increase the CHF to 245.6 W/cm2, which is the highest value obtained using nanowires among reported data (178 and 26% enhanced vs unmodulated plain surface and R-SiNWs, respectively). These well-aligned SiNWs can increase the CHF significantly with efficient coolant supply, and it can ensure high stability in extremely high thermal load systems. Moreover, our study provides nanoscale interfacial design strategies for further improvement of heat dissipation.

Original languageEnglish
Pages (from-to)17595-17602
Number of pages8
JournalACS Applied Materials and Interfaces
Volume9
Issue number20
DOIs
Publication statusPublished - 2017 May 24

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Silicon
Boiling liquids
Nanowires
Coolants
Heat flux
Heat transfer
Heat losses
Thermal load
Cooling systems
Aspect ratio
Fabrication
Liquids

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

Cite this

Shim, Dong Il ; Choi, Geehong ; Lee, Namkyu ; Kim, Taehwan ; Kim, Beom Seok ; Cho, Hyung Hee. / Enhancement of Pool Boiling Heat Transfer Using Aligned Silicon Nanowire Arrays. In: ACS Applied Materials and Interfaces. 2017 ; Vol. 9, No. 20. pp. 17595-17602.
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Enhancement of Pool Boiling Heat Transfer Using Aligned Silicon Nanowire Arrays. / Shim, Dong Il; Choi, Geehong; Lee, Namkyu; Kim, Taehwan; Kim, Beom Seok; Cho, Hyung Hee.

In: ACS Applied Materials and Interfaces, Vol. 9, No. 20, 24.05.2017, p. 17595-17602.

Research output: Contribution to journalArticle

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T1 - Enhancement of Pool Boiling Heat Transfer Using Aligned Silicon Nanowire Arrays

AU - Shim, Dong Il

AU - Choi, Geehong

AU - Lee, Namkyu

AU - Kim, Taehwan

AU - Kim, Beom Seok

AU - Cho, Hyung Hee

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