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| Study on pore scale flow and heat transfer characteristics of nickel-based foam for transpiration cooling |
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Abstract Nickel-based foam material is a viable option for transpiration cooling and heat protection structures in high-speed aircraft due to its lightweight and large specific surface area. Enhancing its overall flow and heat transfer performance is essential to optimize the efficiency of transpiration cooling. The author concentrates on nickel-based alloy foam for transpiration cooling, employing X-CT scanning technology to construct an accurate representation of its micro and microstructure. Based on the multi-relaxation lattice Boltzmann method (MRT-LBM), combined with GPU acceleration technology, a numerical simulation method for the pore-scale heat conduction and convection composite heat transfer of nickel-based alloy foam porous materials for transpiration cooling is established. Using air as a cooling medium, the flow and heat transfer characteristics of nickel-based alloy foam at various Reynolds numbers are analyzed. The results indicate the presence of a Darcy zone, a transitional zone, and a Forchheimer zone in the flow of nickel-based alloy foam, with a critical Reynolds number of 0.136. Furthermore, as the Reynolds number increases, although flow resistance increases, heat transfer efficiency significantly improves. In the Darcy region, heat transfer is primarily conducted by conduction, while in the Transitional zone and the Forchheimer zone, forced convection is dominant. Additionally, the composite heat transfer factor is positively correlated with the Reynolds number, indicating that increasing the Reynolds number can effectively improve the comprehensive heat transfer performance of foam structures. The study on the flow and heat transfer characteristics of nickel-based alloy foam can provide theoretical support for enhancing transpiration cooling efficiency.
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Received: 01 November 2024
Published: 03 April 2025
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2025, Vol. 46 
