Comprehensive Analysis of Critical Heat Flux and Heat Transfers in a Confined Jet Impingement Boiling Cooling System

Abstract This study deepens the understanding of the heterogeneity of thermal exchanges in a cylindrical channel cooled by impinging water jets, considering the influence of transverse air flow and gravity. The results reveal distinct cooling zones, with higher intensity near the stagnation points, where the Critical Heat Flux (CHF) recorded of 4.29 MW/m2 corresponds to a heat transfer coefficient of 19.46 KW/(m2 · K). This CHF value decreases by 50% in the jet overlap points and ranges between 39% to 43% of CHF in the upper and lower zones of the channel, perfectly aligning with bibliographic references and thereby enhancing the credibility of the model. This three-dimensional model based on the inverse method, used to calculate thermal parameters, demonstrates remarkable efficiency with an average relative error of 3%, considering the difference in cooled mass between each side of the channel and the heterogeneity of cooling between the inlet and outlet of the channel. The detailed analysis of local and zonal parameters highlights the importance of the precise position of the jets. This study provides a comprehensive view of the challenges related to cooling cylindrical surfaces. These results enrich the field of thermal management, paving the way for enhanced applications of this technique in critical industrial environments.