Abstract
A complete test system associative with the measurement and data acquisition components was designed and constructed for an experimental investigation on pulsatile pipe flows. The basics of the test system and conducted experiments directed towards the determination of pulsatile flow characteristics at the measurement site in passage from laminar to turbulent regime are presented in this paper. Pulsatile flow was produced by superimposing a purely sinusoidal oscillation on steady axial flow in a rigid circular cross-sectional pipe. The flow nature at the measurement site was determined via cross-sectional velocity and wall pressure gradient measurements in the range of time-averaged Reynolds number; Re ta 1800≤ Re ta≤60,000. The covered ranges for the dominant oscillation parameters; dimensionless frequency parameter ω′ and the oscillation velocity amplitude ratio; A 1 were 5≤ ω′ ≤28 and 0.0035≤ A 1≤0.7113 respectively. The so-called flow reversal observed for the cases with ω′ =7 and ω′ =12.5 was represented in terms of correlations between Re ta, oscillating Reynolds number; Re os and A 1 to describe the flow behaviour in the critical stage prior to the flow reversal.
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