Transitions and Pressure Drop Characteristics of Flow in Channels with Periodically Grooved Parts

摘要: Transitions of flow in periodically grooved channels and pressure drop characteristics are numerically investigated by assuming two-dimensional fully developed fields. It is confirmed that a self-sustained oscillatory occurs at critical Reynolds number from the steady-state as result Hopf bifurcation due to instability. The numbers obtained for various channel geometries. ratio parallel-plate also investigated. shown less than unity expanded geometries subcritical numbers, whereas it increases above supercritical values. On other hand, always contracted