CHEN Hongxia, SUN Yuan, GONG Yifei, HUANG Linbin. Visual measurement and data analysis of pool boiling on silicon surfaces[J]. CIESC Journal, 2019, 70(4): 1309-1317
CHEN Hongxia, SUN Yuan, GONG Yifei, HUANG Linbin. Visual measurement and data analysis of pool boiling on silicon surfaces[J]. CIESC Journal, 2019, 70(4): 1309-1317DOI: 10.11949/j.issn.0438-1157.20181298.
Visual measurement and data analysis of pool boiling on silicon surfaces
The high-speed video and high-speed infrared were used to visual measure the boiling phenomenon on four kinds of monocrystalline silicon surfaces including smooth
cavity
pitch and groove-pitch surfaces. The dynamic evolution process and the local temperature evolution law reveal the boiling enhancement mechanism based on the dynamic process. For the smooth silicon surface
the superheat is 6℃ when the boiling starts under low heat transfer
and this superheat is around 3-4℃ for the three micro-structured surfaces. In addition
compared with the smooth surface
the CHF for cavity
groove-pitch and pitch surfaces are increased by 109%
129% and 140%
respectively. According to the dynamic evolution of bubble
cavities provide the nucleation sites
decrease the nucleation barrier energy and shrink the energy accumulation stage. Pitches significant increase nucleation sites
decrease departure diameter and departure time of bubbles
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