The correlation between mechanical structure and micro-channels in thermal energy storage systems

Aiming to address the challenge of optimizing the heat transfer performance of micro-channels and the mechanical structure strength in thermal energy storage systems in a co-ordinated manner, this paper proposes a bionic coupling structure design and establishes a multi-physics field coupling model. The study analyzes the heat transfer and mechanical properties of rectangular, circular, and triangular micro-channels, constructs a comprehensive performance evaluation index ?, and determines the correlation between the depth-to-width ratio and the maximum allowable deformation. The bionic fractal tree-like micro-channel structure (Scheme C) exhibits a heat transfer efficiency of 89.7% under medium load conditions, which is 14.1% higher than that of the traditional parallel channel (Scheme A). The maximum stress is reduced by 12.2%, and the pressure loss is controlled at 5.4 kPa. After the improved model introduces the mesoscopic effect correction, the heat transfer calculation error of the 50 ?m channel is reduced from 12.5% to 2.7%, and the deviation from the experimental data is ?1.2%. Experimental verification shows that the design achieves a co-ordinated improvement in heat transfer efficiency and structural strength, providing theoretical support for the efficiency and compactness of thermal energy storage systems.