Pulsatile Flows in a Bend

摘要: Distributions of velocity and turbulent intensity in pulsatile flow through a circular cross-sectional 90 degree bend have been examined experimentally when an undeveloped with rectangular axial distribution was introduced. Velocity measurements were made using hot wire probe at the Reynolds number based on time-mean 3×104 frequency parameter 72.3. When introduced to bend, dimensionless profile has configuration differed from that quasi-steady each phase angle, lower region formed near inner wall changes its size pulsation. With cyclic profile, stress are also subject larger change during one cycle, is, they decreased accelerating period increased decelerating one. On other hand turbulence outer found exhibit only slight cycle.