Universal Correlations for Post-CHF Saturated and Superheated Flow Film Boiling Heat Transfer Coefficient, Minimum Heat Flux and Rewet Temperature for Cryogenic Fluids in Uniformly Heated Tubes

Abstract

Despite the many experiments conducted throughout the globe during the past sixty years for a variety of cryogens to determine film boiling heat transfer coefficient (HTC) in a uniformly heated round tube, experimental data are either rarely published or published only for a few cryogens, with majority of the data remaining in archives of original authors, or in obscure technical reports of an organization or other inaccessible sources. In the present study, a very comprehensive data mining effort is undertaken to develop a consolidated database for Post Critical Heat Flux (CHF) flow boiling HTC for cryogens from world literature dating back to 1959. With 1730 local Dispersed Flow Film Boiling (DFFB) and 1310 local Inverted Annular Film boiling (IAFB) HTC data points for LHe, LH2, LN2, and LCH4, it represents the largest cryogen post-CHF HTC database assembled to date. Using this database, new universal cryogen correlations for DFFB and IAFB HTCs are constructed and verified in terms of both predictive accuracy and trend. Similar efforts are carried out to collect a relatively small Minimum Heat Flux (MHF) and local Re-wet Temperature (RW) database, and construct correlations for both.