Experimental and CFD simulation of the pool boiling heat transfer performance in a 3D MCFC composite structured

As the issue of energy becomes increasingly prominent, the field of heat dissipation necessitates more advanced thermal energy utilization technologies. Pool boiling heat transfer is employed in high-power devices with significant heat dissipation due to its high latent heat of vaporization. In this research, we propose a composite structure designed to enhance boiling heat transfer performance from the perspective of bubble dynamics. This structure incorporates a micro/nanoporous medium with a high density of nucleation sites and is a strong driving force for liquid reflux. Additionally, we utilize a CCD high-speed camera to record the bubble state during the boiling process, facilitating the analysis of the mechanisms that enhance pool boiling heat transfer. Our study examines the impact of incorporating 3D microchannels and CNTs on pool boiling heat transfer performance. The findings demonstrate that the critical heat flux (CHF) and heat transfer coefficient (HTC) are significantly improved. Among the composite structures tested, the one with a spacing of 300 mu m exhibits the most notable enhancement. Compared to a polished copper foam surface, this composite structure achieves a reduction in temperature difference Delta T of 2.0 degrees C, a 2.62-fold increase in CHF, and a 2.83-fold increase in HTC. Notably, the simulation results obtained using ANSYS Workbench align with the findings of the experimental study.