Effect of the behavior of generated vapor on the minimum-heat-flux point during rapid quenching of a thin horizontal wire

Hiroshi Honda, Hikaru Yamashiro, Hiroshi Takamatsu, Kazuo Tanaka

Research output: Contribution to journalArticle

Abstract

Heat transfer characteristics and minumum-heat-flux point (MHF point) condition during rapid quenching of a thin horizontal wire were studied both experimentally and theoretically. Experiments were conducted with ethanol as a quenching liquid. The wire was either fixed or moving downward at a constant speed in an ethanol bath. When the wire was heated instantly to a high temperature, bead-like bubbles were formed along the wire. This was in contrast to the previous results for a heated wire that was dipped into the ethanol bath at a relatively high velocity, where a vapor sheet was formed in the wake of the wire. Consideration was given to the effect of film boiling mode on the MHF point condition. A linear stability analysis of vapor film for natural convection film boiling on a horizontal cylinder was presented. The theoretical prediction of the critical vapor film thickness compared well with the measured value at the MHF point for the fixed wire.

Original languageEnglish
Pages (from-to)2806-2813
Number of pages8
JournalNihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Volume65
Issue number636
DOIs
Publication statusPublished - Jan 1 1999

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Rapid quenching
Heat flux
heat flux
Vapors
wire
Wire
vapors
film boiling
Ethanol
ethyl alcohol
Boiling liquids
baths
Linear stability analysis
Natural convection
free convection
wakes
beads
Film thickness
Quenching
film thickness

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanical Engineering

Cite this

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abstract = "Heat transfer characteristics and minumum-heat-flux point (MHF point) condition during rapid quenching of a thin horizontal wire were studied both experimentally and theoretically. Experiments were conducted with ethanol as a quenching liquid. The wire was either fixed or moving downward at a constant speed in an ethanol bath. When the wire was heated instantly to a high temperature, bead-like bubbles were formed along the wire. This was in contrast to the previous results for a heated wire that was dipped into the ethanol bath at a relatively high velocity, where a vapor sheet was formed in the wake of the wire. Consideration was given to the effect of film boiling mode on the MHF point condition. A linear stability analysis of vapor film for natural convection film boiling on a horizontal cylinder was presented. The theoretical prediction of the critical vapor film thickness compared well with the measured value at the MHF point for the fixed wire.",
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