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- W2803353261 abstract "This work presents optical measurements of shock wave attenuation in a glass micro-channel. This transparent facility, with a cross section ranging from $$1,hbox {mm}times 150,upmu hbox {m}$$ to $$1,hbox {mm}times 500,upmu hbox {m}$$ , allowed for the use of high-speed schlieren videography to visualize the propagation of a shock wave within the entire micro-channel and to quantify velocity attenuation of the wave due to wall effects. In this paper, we present the experimental technique and the relevant data treatment we have used to increase the sensitivity of shock wave detection. Then, we compared our experimental results for different channel widths, lengths, and shock wave velocities with the analytical model for shock attenuation proposed by Russell (J Fluid Mech 27(2):305–314, 1967), which assumes laminar flow, and by Mirels (Attenuation in a shock tube due to unsteady-boundary-layer action, NACA Report 1333, 1957) for turbulent flow. We found that these models are inadequate to predict the observed data, owing to the presence of fully developed flow which violates the basic assumption of these models. The data are also compared with the empirical shock attenuation models proposed by Zeitoun (Phys Fluids 27(1):011701, 2015) and Deshpande and Puranik (Shock Waves 26(4):465–475, 2016), where better agreement is observed. Finally, we presented experimental data for the flow field behind the shock wave from measurements of the Mach wave angle which shows globally decreasing flow Mach numbers due to viscous wall effects." @default.
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- W2803353261 date "2018-11-01" @default.
- W2803353261 modified "2023-09-26" @default.
- W2803353261 title "Shock wave attenuation in a micro-channel" @default.
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