Flow Boiling Critical Heat Flux Enhancement on the 2-D Slice for Boric Acid and TSP Solution
NURETH-14 - 2011 September 25-30

Presented at:
2011 September 25-30
Toronto, Canada
Session Title:
C8-1 Advanced Design Features for Severe Accident Mitigation including Combustion and Fires

Hae Min Park (KAIST)
Yong Hoon Jeong (KAIST)
Sun Heo (KHNP, Korea)
Chanyi Song (KHNP, Korea)


The critical heat flux (CHF) on the reactor vessel external wall was measured using the small scale two-dimensional slice test section. The radius of the curvature and the channel area of the test section were 0.15 m and 0.03 m×0.03 m, respectively. The objectives are to assess the effects of additives (TSP, boric acid) and heated material (SA508) in inclination angle 90° and to investigate flow boiling CHF enhancement resulting from various working fluids of 5000 ppm tri-sodium phosphate (TSP, Na3PO4∙12H2O) solution, 4000 ppm boric acid solution and mixture solution of TSP and boric acid. Boric acid solution didn’t show CHF enhancement and TSP and mixture solution showed CHF enhancement (20~34%).

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