Parametric trends for post-CHF heat transfer in rod bundles

Journal Article · Mon Aug 01 04:00:00 EDT 1988 · J. Heat Transfer; (United States)

DOI:https://doi.org/10.1115/1.3250551· OSTI ID:7084761

Unal, C; Tuzla, K; Badr, O; Neti, S; Chen, J

A 3 x 3 rod bundle with a heated shroud was developed to study post-critical-heat-flux (post-CHF) dispersed-flow boiling. The hot-patch technique was applied to a rod bundle, which successfully arrested the quench front at the test section inlet. Measurements included mass flux, wall heat flux, inlet equilibrium quality, wall temperatures along the bundle axis, and actual vapor temperatures upstream and downstream of a spacer grid. The vapor superheat (up to 600 /sup 0/C) increased with increasing wall heat flux and decreasing mass flux and vapor qualtiy. The heat partition ratio (fraction of total heat input that goes toward evaporation) was found to increase with increasing mass flux and decreasing inlet quality but remained essentially independent of heat flux. The results for the rod bundle were found to be in good agreement with trends previously reported for post-CHF heat transfer in single tubes.

• Research Organization: Institute of Thermo-fluids Engineering and Science, Lehigh University, Bethlehem, PA 18015
• OSTI ID: 7084761
• Journal Information: J. Heat Transfer; (United States), Journal Name: J. Heat Transfer; (United States) Vol. 110:3; ISSN JHTRA
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420400* -- Engineering-- Heat Transfer & Fluid Flow
BENCH-SCALE EXPERIMENTS
BOILING
CRITICAL HEAT FLUX
ENERGY TRANSFER
FILM BOILING
FLOW MODELS
HEAT FLUX
HEAT TRANSFER
MATHEMATICAL MODELS
PHASE TRANSFORMATIONS
ROD BUNDLES
TEMPERATURE MEASUREMENT