Residence time and heat transfer when water droplets hit a scalding surface

Ji Yong Park, Chang Ki Min, Steve Granick, David G Cahill

Research output: Contribution to journalArticle

Abstract

We study, using pump-probe optical methods with a time resolution of 1 ms, heat transfer when a series of water droplets impact a smooth surface whose temperature exceeds the boiling point. The volume of the individual water droplets is ≈10 nl, the time between droplets is ≈0.3 ms, and the number of water droplets in the series of droplets is 3, 20, or 100. In the temperature range 100°C T 150°C, our measurements of the heat transfer, and the residence time of water in contact with the surface, show that nearly all of the dispensed water vaporizes, but more rapidly, the higher the temperature. At higher temperatures, 150°C T 220°C, droplet shattering plays an increasingly important role in limiting heat transfer and, as a result, the volume of water evaporated and residence time decrease strongly with increasing temperature.

Original languageEnglish (US)
Article number101503
JournalJournal of Heat Transfer
Volume134
Issue number10
DOIs
StatePublished - Aug 15 2012

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Keywords

  • boiling
  • heat transfer
  • pump-probe measurement
  • residence time
  • water droplets

ASJC Scopus subject areas

  • Mechanical Engineering
  • Mechanics of Materials
  • Materials Science(all)
  • Condensed Matter Physics

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