Abstract
Pulsatile flow dynamics in reference to the relevant experimental research on the manner between the time periods of 1997- 2015 is presented in this paper. The flow field under discussion is generated through a rigid circular cross-sectional pipe as an axial slightly- compressible and sinusoidal one in a controlled range of the oscillation parameters. Laminar and turbulent flow regimes are considered with a particular emphasis devoted to the transitional characteristics of laminar pulsatile flow into turbulence. The definitions of the flow characteristics, the methodology of the experimental studies and the results on the physical nature of the field are described. The departure of pulsatile flow from a steady one is presented in reference to the velocity field and frictional field analyse sunder the influence of oscillation frequency and amplitude. In this context, the critical magnitudes of Womersley number, time-averaged Reynolds number and oscillation amplitude to estimate the ranges of pulsatile flow field are proposed
Highlights
An overview on pulsatile flow dynamics is presented in this paper with the following methodology: i
The pulsatile flow field can be explained with a model which was first introduced by Ohmi and his co-workers in 1980’s
Inside the quasi-steady region, steady flow fundamentals can be used with an acceptable accuracy since the physical flow nature in laminar pulsatile flow and turbulent pulsatile flow resemble the characteristics of steady flow
Summary
An overview on pulsatile flow dynamics is presented in this paper with the following methodology: i. The test systems generate an extensive range of pulsatile air field in the controlled magnitudes of oscillation frequency and amplitude. The local instantaneous velocity wave fronts and instantaneous local pressure measurements are referred to verify the pulsatile flow nature. The instantaneous velocity measurements enable us to calculate the cross sectional time average and oscillating velocity components which are used in the calculation of Reta and Reos in turn. The instantaneous shear stress and the instantaneous flow friction factors can be calculated in reference to velocity and pressure measurements by using the Eq. and the definitions of friction factors given in nomenclature. In the second [5, 9] investigation the primary research is focused on transitional characteristics of pulsatile flow field under the influence of oscillation parameters of frequency and amplitude at the departure from laminar flow regime. The corresponding range of Reta is selected between 1019- 4817
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