Numerical study of the impact of ultra-dilute concentration hybrid nanofluid on improving pool boiling heat transfer from a horizontal heated tube

Le résumé fourni par la source

Efficient thermal management is critical for high-power electronics and industrial heat exchangers, where pool boiling serves as a highly effective cooling mechanism. Despite experimental progress, there remains a notable scarcity of numerical studies investigating the influence of ultra-dilute hybrid nanofluid (HNF) concentrations on boiling performance and bubble dynamics. This study addresses this gap by exploring the hypothesis that dispersing hybrid nanoparticles (CeO 2 -MgO and CeO 2 -SiO 2 ) in DI water at ultra-low concentrations (<0.1 vol%) can substantially enhance heat transfer through modified fluid properties and interfacial interactions. A robust numerical framework was developed using the Eulerian-Eulerian multiphase approach, integrated with a modified Rensselaer Polytechnic Institute boiling model and the finite volume method. As a key contribution, new physics-based correlation equations are proposed for the heat transfer coefficient, bubble departure diameter, and nucleation site density. The results demonstrate that increasing nanoparticle concentration promotes vapor generation and significantly improves nucleation site density, shifting the boiling curves towards higher performance. Notably, the CeO 2 -MgO HNF at 0.1% concentration achieved a maximum heat transfer enhancement of 33.3% compared to pure DI water. These findings establish a predictive framework that bridges the gap between fundamental boiling physics and practical cooling hardware design.

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