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