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.

Volume Subject Area:
Heat Transfer in Multi-Phase Flow
Keywords:
jet impingement, heterogeneous heat exchange, cylindrical channel, inverse method, enhanced thermal management, critical heat flux
Topics:
Boiling, Cooling systems, Critical heat flux, Heat transfer, Thermal management
This content is only available via PDF.
Copyright © 2024 by a non-US government agency. This work was prepared while under employment by the government of a non-US government agency as part of the official duties and as such Copyright is owned by that government, which reserves its own Copyright under national law.
You do not currently have access to this content.