Abstract

In Stirling engine, the regenerator operates with oscillating flow, a detailed description of fluid flow and heat transfer become crucial. The oscillating flow is driven by a piston to assure an expansion-compression cycle. The scope of this work involves the development of a computational model of flow and heat transfer in a two-dimensional horizontal cylinder partially filled with an open cell metal foam block attached strip heat source at the lateral wall. The governing equations in two-dimensional laminar regime are written in local thermal equilibrium (LTE). The presence of the open-cell metal foam is modeled as a porous media by means of the Darcy-Brinkman-Forchheimer law. The numerical study is conducted by MVCEF Method, which is an efficiently way compared to that of the traditional continuum Navier-Stokes method, for a non-structured moved grid. The SIMPLER algorithm has been implemented. The effect of the foam on hydrodynamic and heat transfer behavior is showed. Simulations were performed for a fixed piston speed (Re=100) and for various metal foam radius (0.2R≤Rp≤R), porosity (0.5≤ε≤0.9), Darcy number (10−5≤Da≤10−3) and Womersley number (5≤Mo≤15).

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