Effect of salt additives on film boiling heat transfer and mechanism of quenching temperature rise

Takahiro Arai, Masahiro Furuya

Research output: Contribution to journalArticle

Abstract

A high-temperature stainless-steel sphere was immersed into various salt solutions to test film boiling behavior at vapor film collapse. The film boiling behavior around the sphere was observed with a digital-video camera. Because salt additives enhanced condensation heat transfer, the observed vapor film was thinner. Surface temperature of the sphere was measured. Salt additives increased the quenching (vapor film collapse) temperature, because frequency of direct contact between sphere surface and coolant increased. Quenching temperature rises with increased salt concentration. The quenching temperature is well correlated with ion molar concentration, which is a number density of ions, regardless of the type of hydrated salts.

Original languageEnglish
Pages (from-to)1932-1938
Number of pages7
JournalNihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Volume75
Issue number758
DOIs
Publication statusPublished - 2009 Jan 1
Externally publishedYes

Fingerprint

film boiling
Boiling liquids
Quenching
heat transfer
quenching
Salts
Heat transfer
salts
Vapors
vapors
Temperature
temperature
Ions
Digital cameras
coolants
Video cameras
ion concentration
Coolants
surface temperature
stainless steels

Keywords

  • Ion molar concentration
  • Quenching temperature
  • Salt
  • Vapor explosion
  • Vapor film collapse

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering

Cite this

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AB - A high-temperature stainless-steel sphere was immersed into various salt solutions to test film boiling behavior at vapor film collapse. The film boiling behavior around the sphere was observed with a digital-video camera. Because salt additives enhanced condensation heat transfer, the observed vapor film was thinner. Surface temperature of the sphere was measured. Salt additives increased the quenching (vapor film collapse) temperature, because frequency of direct contact between sphere surface and coolant increased. Quenching temperature rises with increased salt concentration. The quenching temperature is well correlated with ion molar concentration, which is a number density of ions, regardless of the type of hydrated salts.

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