空間発達する円管内流れにおける熱伝達に与える振動制御の影響

抄録

Convective heat transfer of a pipe flow with vibration control is investigated by direct numerical simulation (DNS). This study aims at the application like a catalytic converter, which consists of thin tubes. The effect of spatial development in the flow and thermal field toward the downstream was examined. The computational domain consists of two parts: a main part for vibration control and a driver part for generating turbulent inflow of the main part. The friction Reynolds number Re_τ is 110 in the driver part and 60 in the main part. Vibration control is expressed as inertial force applied to the fluid, and its parameters are the amplitude and the frequency. Owing to the vibration control, the Nusselt number Nu increases almost all over the domain than that without control. In the downstream part of the domain, Nu with vibration becomes almost constant and is similar to the value in a previous study applying periodic boundary condition in the axial direction. Increasing rate of Nu in the downstream part is 53%. The radial profile of radial turbulent intensity and radial turbulent heat flux becomes converged with spatial development. The phase-averaged temperature field moves perpendicular to the axis according to the vibration phase and approaches the wall. The movement in the downstream part is not changed in the axial direction.