Evaluation of subcooled CHF correlations using the PU-BTPFL CHF database for vertical upflow of water in a uniformly heated round tube
- Purdue Univ., West Lafayette, IN (United States)
A simple methodology for assessing the predictive ability of critical heat flux (CHF) correlations applicable to subcooled flow boiling in a uniformly heated vertical tube was developed. Popular correlations published in handbooks and review articles as well as the most recent correlations were analyzed with a database compiled by the authors. The PU-BTPFL CHF Database, which contains 29,718 CHF data points, is the largest collection of CHF data ever cited in the world literature. The parametric ranges of the CHF database are diameters from 0.3 to 45 mm, length-to-diameter ratios from 2 to 2484, mass velocities from 0.01 {times} 10{sup 3} to 138 {times} 10{sup 3} kg m{sup {minus}2} s{sup {minus}1}, pressures from 1 to 223 bars, inlet subcoolings from 0 to 347 C, inlet qualities from {minus}2.63 to 0.00, outlet subcoolings from 0 to 305 C, outlet qualities from {minus}2.13 to 1.00, and critical heat fluxes from 0.05 {times} 10{sup 6} to 276 {times} 10{sup 6}W m{sup {minus}2}. The database contained 4357 data points having a subcooled outlet condition at CHF. The correlation published in Caira et al. (1993) was the most accurate in both low and high mass velocity regions having been developed with a larger database than most correlations. In general, CHF correlations developed from data covering a limited range of flow conditions can not be extended to other flow conditions without much uncertainty. Subcooled flow boiling has great potential for accommodating the high heat fluxes in such diverse applications as fusion and fission reactors, manufacturing and materials processing, advanced space thermal management systems, accelerator targets, avionic cold plates, X-ray anodes, and high-density multi-chip modules in supercomputers and other modular electronics.
- DOE Contract Number:
- FG02-93ER14394
- OSTI ID:
- 428068
- Report Number(s):
- CONF-960815--; ISBN 0-7918-1508-0
- Country of Publication:
- United States
- Language:
- English
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