Abstract
The effects of time-averaged Reynolds number, pulsation frequency and velocity amplitude ratio on the structure of turbulence in a pulsatile turbulent pipe flow were experimentally investigated. A turbulence model including a lag in response-time was presented and its applicability was examined from comparison with experimental results. The radial distribution of time-averaged component of the root mean square value of turbulence agrees well with that of steady pipe flow. The amplitude ratio and phase difference of oscillatory component were defined by choosing the cross-sectional mean velocity as a reference velocity. They are independent of velocity amplitude ration but affected by pulsation frequency and time-averaged Reynolds number. The present turbulence model is applicable to the whole cross-section of a pie except for the region very close to the wall.
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