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Studies on critical heat flux in flow boiling at near critical pressures.

Author(s) : VIJAYARANGAN B. R., JAYANTI S., BALAKRISHNAN A. R.

Type of article: Article

Summary

Experimental studies on critical heat flux (CHF) have been conducted in a uniformly heated vertical tube of 12.7 mm internal diameter and 3 m length at different reduced pressures ranging from 0.24 to 0.99 with R134a as the working fluid. The onset of CHF was determined by the sudden rise in the wall temperature of the electrically heated tube. Experiments were performed over a wide range of parameters: mass flux values from 200 to 2000 kg/m2.s, pressure from 10 to 39.7 bars and heat flux from 2 to 80 kW/m2 and exit quality from 0.17 to 0.94. The results show considerably lower critical heat flux at high pressures. Well known CHF prediction methods, such as the look-up table and correlations of earlier workers show poor agreement at high pressures. A new correlation has been proposed to estimate the CHF in uniformly heated vertical tubes up to the critical pressure and over a wide range of parameters. [Reprinted with permission from Elsevier. Copyright, 2005].

Details

  • Original title: Studies on critical heat flux in flow boiling at near critical pressures.
  • Record ID : 2006-2273
  • Languages: English
  • Source: International Journal of Heat and Mass Transfer - vol. 49 - n. 1-2
  • Publication date: 2006/01

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