Boiling Condensation Htc: flow_boiling
Boiling and condensation heat transfer coefficients — pool boiling (nucleate, film, CHF), flow boiling (subcooled, saturated, annular, microchannel), and condensation (filmwise, dropwise, in-tube) correlations and data
| regime | record id | applicability notes | correlation name | fluid | geometry | heat flux kWm2 (kW/m2) | htc high Wm2K (W/m2K) | htc low Wm2K (W/m2K) | htc typical Wm2K (W/m2K) | orientation | pressure kPa (kPa) | sub regime |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| flow_boiling | annular_flow#r134a#round_tube#horizontal#770kPa | Annular flow boiling R-134a; high quality region x>0.6; convective contribution dominates; Kandlikar correlation includes fluid-dependent parameter F_fl=1.0 for R-134a; CHF at x~0.9 | Kandlikar 1990 | r134a | round_tube | 20 | 35,000 | 5,000 | 15,000 | horizontal | 770 | annular_flow |
| flow_boiling | annular_flow#water#round_tube#vertical_upflow#101kPa | Annular flow boiling at high quality (x=0.5-0.9); thin liquid film on tube wall with vapor core; very high HTC due to thin film evaporation; HTC increases with quality until dryout; Gungor-Winterton correlation preferred | Gungor-Winterton 1986 | water | round_tube | 200 | 100,000 | 20,000 | 50,000 | vertical_upflow | 101.3 | annular_flow |
| flow_boiling | dryout_post_dryout#water#round_tube#vertical_upflow#101kPa | Post-dryout (dispersed flow film boiling); droplet-laden vapor; HTC drops sharply at dryout; wall temp spikes (departure from nucleate boiling DNB); critical in BWR and steam generator design | Groeneveld 1973 | water | round_tube | 200 | 5,000 | 500 | 1,500 | vertical_upflow | 101.3 | dryout_post_dryout |
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