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Surface roughening for hemi-wicking and its impact on convective boiling heat transfer
- Source :
- International Journal of Heat and Mass Transfer. 102:1100-1107
- Publication Year :
- 2016
- Publisher :
- Elsevier BV, 2016.
-
Abstract
- Superhydrophilicity accompanying hemi-wicking driven by interfacial capillary force can be induced by constructing interfacial structures. We uncover the underlying mechanism for the morphologically driven hemi-wicking, and extend its impact into the practical heat transferring scheme of convective boiling system: the morphologically-driven hemi-wicking on a roughened interface can contribute greatly to the enhancement of boiling heat transfer performance of the convective heat dissipation capacity of critical heat flux (CHF). We present design prerequisites on controlling characteristic lengths of nanoscale interfacial structures that initiate hemi-wicking and consequently enhance boiling performance. Interfacial liquid refreshing through morphologically driven hemi-wicking leads to a greater than 100% increase in CHF by roughening surfaces using vertically aligned silicon nanowire structures (SiNWs). We confirm strong wicking characteristics are essential to increase CHF, however it must be differentiated from surface roughening. Even though the roughening is a prerequisite for leading to the wicking, it can even deteriorate CHF without involving advantage of the interfacial re-wetting. Dimensional prerequisites that initiate hemi-wicking by modulating the characteristic length of SiNWs can be design guidelines for pragmatic engineering applications to enhance feasibility and reliability. We use our findings to put forward a guideline to improve boiling performance, and suggest a way to make breakthrough in heat and energy transfer systems through the functionalized interface.
- Subjects :
- Fluid Flow and Transfer Processes
Materials science
Characteristic length
Convective heat transfer
Critical heat flux
Capillary action
Mechanical Engineering
Nanotechnology
02 engineering and technology
Mechanics
Dissipation
021001 nanoscience & nanotechnology
Condensed Matter Physics
01 natural sciences
010305 fluids & plasmas
Boiling
0103 physical sciences
Heat transfer
0210 nano-technology
Nucleate boiling
Subjects
Details
- ISSN :
- 00179310
- Volume :
- 102
- Database :
- OpenAIRE
- Journal :
- International Journal of Heat and Mass Transfer
- Accession number :
- edsair.doi...........9cdad57b7df6db3dfa15756ac3c2c15a