Abstract
In this study, we conducted dynamic droplet wetting tests and saturated water pool boiling experiments on micro-structured surfaces with well-ordered micro-sized pillars (MP) and holes (MH), as well as on hierarchically structured surfaces with nano-sized wires on the pillars (MN-P) and holes (MN-H). The dynamic wetting tests revealed that surface morphology significantly affected both the wetting behaviour and state of the test surfaces. On the MP surface, a Cassie-Baxter state was formed by air trapped between the micro-pillars, and droplet rebounding occurred. However, Wenzel or mixed-state wetting occurred on the MH, MN-P, and MN-H surfaces. In addition, the nano-wires enhanced the surface energy and magnified the liquid imbibition parameter of the hierarchically structured surfaces. The dynamic wetting characteristics of the test surfaces significantly affected the boiling critical heat flux (CHF) values. However, the CHF results could not be explained only by the dynamic wetting behaviours of the test surfaces. Thus, in order to reasonably describe the CHF results, we investigated the experimental results with regard to changes in surface energy, bubble nucleation, and capillary pressure potential resulting from the different surface morphologies.
| Original language | English |
|---|---|
| Pages (from-to) | 19-26 |
| Number of pages | 8 |
| Journal | Experimental Thermal and Fluid Science |
| Volume | 74 |
| DOIs | |
| Publication status | Published - 2016 Jun 1 |
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All Science Journal Classification (ASJC) codes
- Chemical Engineering(all)
- Nuclear Energy and Engineering
- Aerospace Engineering
- Mechanical Engineering
- Fluid Flow and Transfer Processes
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Dynamic wetting and boiling characteristics on micro-structured and micro/nano hierarchically structured surfaces. / Moon, Hyun Wook; Yoon, Young Joong; Park, Jeong Ho; Myung, Byung Soo; Kim, Dong Eok.
In: Experimental Thermal and Fluid Science, Vol. 74, 01.06.2016, p. 19-26.Research output: Contribution to journal › Article
TY - JOUR
T1 - Dynamic wetting and boiling characteristics on micro-structured and micro/nano hierarchically structured surfaces
AU - Moon, Hyun Wook
AU - Yoon, Young Joong
AU - Park, Jeong Ho
AU - Myung, Byung Soo
AU - Kim, Dong Eok
PY - 2016/6/1
Y1 - 2016/6/1
N2 - In this study, we conducted dynamic droplet wetting tests and saturated water pool boiling experiments on micro-structured surfaces with well-ordered micro-sized pillars (MP) and holes (MH), as well as on hierarchically structured surfaces with nano-sized wires on the pillars (MN-P) and holes (MN-H). The dynamic wetting tests revealed that surface morphology significantly affected both the wetting behaviour and state of the test surfaces. On the MP surface, a Cassie-Baxter state was formed by air trapped between the micro-pillars, and droplet rebounding occurred. However, Wenzel or mixed-state wetting occurred on the MH, MN-P, and MN-H surfaces. In addition, the nano-wires enhanced the surface energy and magnified the liquid imbibition parameter of the hierarchically structured surfaces. The dynamic wetting characteristics of the test surfaces significantly affected the boiling critical heat flux (CHF) values. However, the CHF results could not be explained only by the dynamic wetting behaviours of the test surfaces. Thus, in order to reasonably describe the CHF results, we investigated the experimental results with regard to changes in surface energy, bubble nucleation, and capillary pressure potential resulting from the different surface morphologies.
AB - In this study, we conducted dynamic droplet wetting tests and saturated water pool boiling experiments on micro-structured surfaces with well-ordered micro-sized pillars (MP) and holes (MH), as well as on hierarchically structured surfaces with nano-sized wires on the pillars (MN-P) and holes (MN-H). The dynamic wetting tests revealed that surface morphology significantly affected both the wetting behaviour and state of the test surfaces. On the MP surface, a Cassie-Baxter state was formed by air trapped between the micro-pillars, and droplet rebounding occurred. However, Wenzel or mixed-state wetting occurred on the MH, MN-P, and MN-H surfaces. In addition, the nano-wires enhanced the surface energy and magnified the liquid imbibition parameter of the hierarchically structured surfaces. The dynamic wetting characteristics of the test surfaces significantly affected the boiling critical heat flux (CHF) values. However, the CHF results could not be explained only by the dynamic wetting behaviours of the test surfaces. Thus, in order to reasonably describe the CHF results, we investigated the experimental results with regard to changes in surface energy, bubble nucleation, and capillary pressure potential resulting from the different surface morphologies.
UR - http://www.scopus.com/inward/record.url?scp=84949944139&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84949944139&partnerID=8YFLogxK
U2 - 10.1016/j.expthermflusci.2015.11.019
DO - 10.1016/j.expthermflusci.2015.11.019
M3 - Article
AN - SCOPUS:84949944139
VL - 74
SP - 19
EP - 26
JO - Experimental Thermal and Fluid Science
JF - Experimental Thermal and Fluid Science
SN - 0894-1777
ER -