Experimental analysis reveals how frequency and groove length affect flow instability in grooved channels.
The characteristics of flow structure under pulsatile flow with same oscillatory fraction in the grooved channel are investigated experimentally. The flow patterns under pulsatile flow in the grooved channel are divided into 4kinds in this study. The effects of frequency, groove length and t/T on the flow patterns are analyzed. The results showed that the instability of the flow enhances with t/T during the deceleration phase. As the frequency increases, the onset of the unstable flow state is postponed, but the strongly unstable state (3) starts to appear and advance gradually. Moreover, the onset of the unstable state gradually advances as the increase of groove length.
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Yang et al. (2020) studied this question.
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