急減速する管内流の乱れ発達過程の考察

抄録

Impulsive decelerated flow in a pipe is important for development of turbulence, and when we attempt drug delivery in human lung, so turbulence is important for drug deposition. When pipe end is closed, turbulence develop from pipe end. But We suppose the middle of unbound long pipe to ignoring the effect of pipe end. This research focuses on this development of turbulence, and considers its characteristics by using CFD. Turbulence at high Re(≥5000) rise and to be dispersed whole region of pipe, and this turbulence accelerates deposition of particle. And compere Poiseuille flow and impulsive decelerated flow by analyzing spectrum. it was found that turbulence of impulsive decelerated flow develops faster than Poiseuille flow, and turbulence was prominent at R/D~0.6.