ELASTIC-VISCOPLASTIC ANALYSIS OF ULTRA-FINE PLATE-FIN STRUCTURES WITH LAMINATE MISALIGNMENT USING A HOMOGENIZATION THEORY

摘要

Ultra-fine plate-fin structures for heat exchangers, manufactured by stacking thin metallic plates and fins alternately (Fig. 1) offer high heat exchanger efficiency, because their small structures provide large heat-transfer areas. Thus, they are expected to be used in the heat exchangers of high temperature gas-cooled reactor gas-turbine (HTGR-GT) systems. The HTGR-GT systems are regarded as some of the most promising power generating systems because of their excellent balance between power generation and economic efficiency. In the systems, helium is employed as a working fluid, which becomes extremely hot and can reach 950°C. It is therefore important to analyze not only elastic behavior but also inelastic behavior of ultra-fine plate-fin structures.