Convective Instability of a Planar Mixing Layer in a Thermodynamic State Near the Critical Point
Leonardo S. de B. Alves1
1 UFF
doi:10.20906/CPS/COB-2015-1830
Resumo
A classical linear stability analysis is employed to investigate the onset of convective instability as well as the convectively unstable behavior of the planar mixing-layer flow of a supercritical fluid. The word supercritical here implies a thermodynamic state of the fluid that is above but still near its critical point. Under these conditions, all fluid properties undergo strong and steep variations even when subject to small temperature and/or pressure changes. This compressibility effect is known to generate thermo-acoustic waves in confined fluids that promote a fast increase of the fluid's bulk temperature. The major goal of the present paper is to understand how the proximity to the thermodynamic critical point affects the linear stability of a compressible planar mixing layer.
Palavras-chave: Supercritical Fluids; Kelvin-Helmholtz Instability; Matrix Forming; Finite-Differences