The effects of the surface roughness on the dynamic behavior of the successive micrometric droplets impacting onto inclined hot surfaces

Deendarlianto, Yasuyuki Takata, Masamichi Kohno, Sumitomo Hidaka, Takaaki Wakui, Akmal Irfan Majid, Hadiyan Yusuf Kuntoro, Indarto, Adhika Widyaparaga

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Abstract

The effect of surface roughness on the dynamic behavior and the heat transfer phenomena of multiple successive micrometric water droplets impacting onto inclined heated solid surfaces has been studied experimentally. The inclination angles were 15°, 30°, and 45° from horizontal. The droplet diameters were 500 μm and 700 μm. The solid surface temperatures were decreased from 500 °C to 100 °C. The test material was stainless steel-grade 304 (SUS 304) with different surface roughness ranged from Ra 0.04 up to Ra 10. The droplet dynamics during the impacting onto inclined hot surfaces were investigated by using high-speed video camera. It was found that the surface roughness significantly affects quenching behavior. The higher the surface roughness, the lower the quenching time during the spray cooling. The solid-droplet contact time and the droplet spread diameter increase with the increase of surface roughness. Thus causing the decrease of the quenching time of inclined hot walls. Meanwhile, the critical heat flux and Leidenfrost temperatures are shown to be insensitive to the surface roughness.

Original languageEnglish
Pages (from-to)1217-1226
Number of pages10
JournalInternational Journal of Heat and Mass Transfer
Volume101
DOIs
Publication statusPublished - Oct 1 2016

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All Science Journal Classification (ASJC) codes

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

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