Analysis of heat transfer characteristics of a sandwich cylindrical shell with a metal-rubber core

This work aims to analyze the heat transfer characteristics of a sandwich cylindrical shell with a metal-rubber core (SCS-MR) using both finite element analysis and experimental techniques. The SCS-MR is a lightweight and high-temperature resistant material that is suitable for construction in environments with varying condi-tions, such as rocket launchers, aircraft injectors and ships. The heat transfer, heat flux, and thermal convection loss were first analyzed using thermal resistance and Fourier law. Subsequently, a representative volume element of the SCS-MR was established to simulate thermal transfer, followed by a series of comparative experiments that measured the temperature gradients, the boundary conditions, and the density of the SCS-MR. Additionally, three types of metal spirals were examined using differential scanning calorimeter (DSC). The convective thermal conductivity, heat flux, and heat convection loss of the SCS-MR were analyzed experimentally, revealing that the metal spiral exhibited an exothermic peak in the DSC. Furthermore, the heat transfer rate of the SCS-MR was faster than that of the solid cylindrical shell (CS) when the set temperature was reached. The insulation cover was capable of providing boundary conditions to minimize the impact of natural convection. In the high-temperature environment, the thermal conductivity decreased with increasing density of the scaled model SCS-MR.