Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
An Analysis of Correlations for High Levels of Critical Heat Flux for Convective Boiling
Submission Author:
Rhandrey Maestri , SP
Co-Authors:
Rhandrey Maestri, Cristiano Tibiriçá
Presenter: Rhandrey Maestri
doi://10.26678/ABCM.COBEM2019.COB2019-1462
Abstract
Critical heat flux (CHF) is the maximum amount of heat flux that can be allowed in phase change thermalsystems before causing irreversible damage to them. Due to the complexity of modelling the CHF in convective boiling,the methods for its prediction are usually based on empirical correlations based on dimensionless groups. In this workwe analyse CHF literature correlations for high levels of CHF. This study is aiming at evaluation the existing CHFcorrelations for flow boiling with available databases. The reference dataset is composed of 315 and 460 data pointsfor saturated and subcooled conditions respectively, covering wide ranges of operating conditions of outlet pressure from1,31 to 172.4 bar; internal diameter from 0.33 to 2.67 mm; heated length from 2.67 to 100 mm; outlet temperature from33 to 187.5◦Cand critical heat flux from 0.167 to 276MWm−2. Among the predictive tools available in literatureeight correlations for saturated and three for subcooled coditions were selected. The Tibiriçá (2011) correlation seem tobe the most reliable predictive tool for saturated conditions at high levels of CHF while the Hall and Mudawar (1999)correlation seem to be the most reliable for calculation of the CHF in subcooled flow boiling.
Keywords
Critical Heat Flux, correlations, burnout
