Experimental Investigations on Microshock Waves and Contact Surfaces

Physical Review Letters
Yun KaiUlrich Teubner

Abstract

The present work reports on progress in the research of a microshock wave. Because of the lack of a good understanding of the propagation mechanism of the microshock flow system (shock wave, contact surface, and boundary layer), the current work concentrates on measuring microshock flows with special attention paid to the contact surface. A novel setup involving a glass capillary (with a 200 or 300  μm hydraulic diameter D) and a high-speed magnetic valve is applied to generate a shock wave with a maximum initial Mach number of 1.3. The current work applies a laser differential interferometer to perform noncontact measurements of the microshock flow's trajectory, velocity, and density. The current work presents microscale measurements of the shock-contact distance L that solves the problem of calculating the scaling factor Sc=Re×D/(4L) (introduced by Brouillette), which is a parameter characterizing the scaling effects of shock waves. The results show that in contrast to macroscopic shock waves, shock waves at the microscale have a different propagation or attenuation mechanism (key issue of this Letter) which cannot be described by the conventional "leaky piston" model. The main attenuation mechanism of microshock flow may be ...Continue Reading

References

Jun 28, 2011·Physical Review Letters·T PezerilKeith A Nelson
Oct 3, 2015·Physical Review Letters·A H SulaimanG B Hospodarsky
Mar 24, 2016·Reports on Progress in Physics·A MarcowithA Stockem Novo

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