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Experimental study of onset of subcooled annular flow boiling

Ahmadi, R ; Sharif University of Technology | 2009

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  1. Type of Document: Article
  2. DOI: 10.1016/j.pnucene.2008.05.003
  3. Publisher: 2009
  4. Abstract:
  5. An experimental study on the onset of nucleate boiling (ONB) is performed for water annular flow to provide a systematic database for low pressure and velocity conditions. A parametric study has been conducted to investigate the effect of pressure, inlet subcooling, heat and mass flux on flow boiling. The test section includes a Pyrex tube with 21 mm inner diameter and a stainless steel (SS-304) rod with outer diameter of 6 mm. Pressure, heat and mass flux are in the range of 1.73 < P < 3.82 bar, 40 < q < 450 kW/m2 and 70 < G < 620 kg/m2 s, respectively. The results illustrate that inception heat flux is extremely dependent on pressure, inlet subcooling temperature and mass flux; for example in pressure, velocity and inlet subcooling as 3.27 bar, 230 kg/m2 s and 41.3 °C; consequently qw,ONB is 177.3 kW/m2. In other case with higher inlet temperature of 71.5 °C and with P, 3.13 bar and G, 232 kg/m2 s the inception heat flux reached to 101.6 kW/m2. The data of ONB heat flux are over estimated from the existing correlation, and maximum deviation of wall superheat (ΔTw,ONB) from correlations is 30%. Experimental data of inception heat flux are within 22% of that predicted from the correlation. © 2008
  6. Keywords:
  7. Two-phase flow ; Experiments ; Fluid dynamics ; Multiphase flow ; Nucleate boiling ; Stainless steel ; Two phase flow ; Annular flow ; Effect of pressures ; Experimental datums ; Experimental studies ; Inlet subcooling ; Inlet temperatures ; Inner diameters ; Low pressures ; Mass fluxes ; Maximum deviations ; On flows ; Onset of nucleate boiling ; Outer diameters ; Parametric studies ; Pyrex tubes ; Test sections ; Velocity conditions ; Heat flux
  8. Source: Progress in Nuclear Energy ; Volume 51, Issue 2 , 2009 , Pages 361-365 ; 01491970 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/pii/S0149197008000875