Experimental investigation of CHF in transient boiling systems: Part 1 - natural convective boiling

Yong Tae Kang, Richard N. Christensen

Research output: Contribution to journalConference article

Abstract

An experimental investigation on Critical Heat Flux (CHF) in a temperature controlled natural convective boiling system is reported in this paper. The purpose of this study was to investigate the effects of the power transient and gap distance on CHF in narrow, vertical, rectangular channels between parallel plates. New parameters, rate of change of wall temperature at CHF point, (dTw/dt)CHF, and nondimensional transient parameter, τ = z̄2fTsat(dTw/dt)CHF, were introduced and they were found to be appropriate transient parameters to evaluate the effects of power transients and geometry of the test section. The experimental results showed that the CHF values at downstream of the channel were recorded at first, and lower than those at upstream in the current transient boiling system and the CHF in transient natural convective boiling with vertical rectangular parallel plate channels was 1 - 2.1 times greater than the corresponding steady state CHF.

Original languageEnglish
Pages (from-to)39-49
Number of pages11
JournalAmerican Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD
Volume294
Publication statusPublished - 1994
EventProceedings of the 1994 International Mechanical Engineering Congress and Exposition - Chicago, IL, USA
Duration: 1994 Nov 61994 Nov 11

ASJC Scopus subject areas

  • Mechanical Engineering
  • Fluid Flow and Transfer Processes

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