NUMERICAL ANALYSIS OF HEAT DIFFUSION IN MULTILAYER COMPOSITE MATERIAL

Abstract

The transient heat conduction of multi-layered composite material plays a vital role in the various engineering applications like thermal insulation, electronic packaging, and aerospace structures in a broad range of engineering practice. The paper is a numerical study of transient heat conduction in multilayer composite in a finite difference approach. The regulating heat diffusion equations are simplified with the help of implicit time integration method in order to ensure the numerical stability of the equations in the large differences of the thermophysical properties. Special attention is paid to the treatment of the interface, including interfacial thermal resistance to impair the perfect bonding. The grid independence analysis and convergence analysis are the methods used to validate the numerical framework. The results show that big temperature gradients can develop about interfaces, particularly when there is a significant difference with regard to the thermal conductivity between one individual layer and another. Thermal barrier may and can be the low-conductivity layers but interfacial thermal resistance may give temperature jumps that may dramatically influence the overall heat transfer behaviour. The study reports that the correct modelling of interfaces and method of discretization in prediction of the transient thermal response are significant. The recommended numerical modeling may serve as the acceptable basis of thermal analysis and planning of the contemporary multi-layered composite systems.