Abstract
A laser-induced fluorescence (LIF) method was used to visualize and measure instantaneous velocity profiles in pulsatile water flow through a tapered U-bend of circular cross-section. Visualization of instantaneous velocity profiles across the tube was made at eight different phases in a period of the pulsatile flowrate waveform. Stereographs of instantaneous velocity profiles and instantaneous contours of equi-velocity in a tapered U-bend was obtained. As a result, it was found that at the outlet of the tapered tube the flow velocity gradient near wall was very steep, and in spite of this fact, some reverse flow appeared near the inner wall of the tapered U-bend at the deceleration phase in the pulsatile flow.
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