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Using Look Up Tables to Predict Critical Heat Flux in Rectangular Channels Jonathan Manning

Using Look Up Tables to Predict Critical Heat Flux in Rectangular Channels Jonathan Manning Supervisors: S.P. Walker, P. Chard- Tuckey. What is CHF?. A. CHF Mechanisms. Dryout of an annular film. Bubble crowding in sub-cooled boiling. The Look Up Table. Groeneveld et al (2007).

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Using Look Up Tables to Predict Critical Heat Flux in Rectangular Channels Jonathan Manning

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  1. Using Look Up Tables to Predict Critical Heat Flux in Rectangular Channels Jonathan Manning Supervisors: S.P. Walker, P. Chard-Tuckey

  2. What is CHF? A

  3. CHF Mechanisms Dryout of an annular film Bubble crowding in sub-cooled boiling

  4. The Look Up Table Groeneveldet al (2007)

  5. Rectangular Channels 12 mm Zhenget al (1997) (0.2, 0.5, 1, 3) mm 10mm 0.7 mm Levy et al (1959) 3.0 mm 61.1 mm 21.8 mm 1.3 mm De Bortoliet al (1958) 2.5 mm 25.4 mm

  6. Effect of Channel Width

  7. The Effect of Applying Heating to the Corners

  8. CHF at Different Qualities

  9. Distribution of Flow Regimes at CHF

  10. Conclusions • The LUT is not accurate for small plate separations • The LUT is not accurate for rectangular geometries with heated corners • The LUT is not accurate for high quality dryout in rectangular channels • High quality dryout in annular flow is an important area of investigation

  11. Proposal • Create a phenomenological model of annular flow dryout for rectangular channelsmade up of • Deposition rate correlations • Entrainment rate correlations • Relationship between film mass flow rate and CHF onset

  12. Questions?

  13. References • De Bortoli, R. A., et al (1958). Forced convection heat transfer burnout studies for wate in rectangular channels and round tubes at pressures above 500 psia, WAPD-188. • Groeneveld, D. C., et al. (2007). "The 2006 CHF look-up table." Nuclear Engineering and Design237(15-17): 1909-1922. • Levy, S., R. A. Fuller, et al. (1959). "Heat Transfer to Water in Thin Rectangular Channels." Journal of Heat Transfer81: 129-143. • Zheng, L., T. Iguchi, et al. (1997). Critical Heat Flux of Forced Flow Boiling in a Narrow One-Side Heated Rectangular Flow Channel, JAERI-Research 97-054.

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