Shock waves in ideal fluid mixtures with several temperatures

1974 ◽  
Vol 53 (3) ◽  
pp. 277-294 ◽  
Author(s):  
Ray M. Bowen ◽  
Peter J. Chen

1979 ◽  
Vol 33 (4) ◽  
pp. 265-280 ◽  
Author(s):  
R. M. Bowen ◽  
P. J. Chen


1973 ◽  
Vol 51 (4) ◽  
pp. 261-277 ◽  
Author(s):  
Ray M. Bowen ◽  
Robert L. Rankin


1972 ◽  
Vol 47 (3) ◽  
pp. 171-187 ◽  
Author(s):  
Ray M. Bowen ◽  
Peter J. Chen


1988 ◽  
Vol 65 (5) ◽  
pp. 1235-1252 ◽  
Author(s):  
K.S. Shing ◽  
K.E. Gubbins ◽  
K. Lucas


Acoustics ◽  
2020 ◽  
Vol 2 (1) ◽  
pp. 147-163
Author(s):  
Jitendra Kewalramani ◽  
Zhenting Zou ◽  
Richard Marsh ◽  
Bruce Bukiet ◽  
Jay Meegoda

In this paper, nonlinearity associated with intense ultrasound is studied by using the one-dimensional motion of nonlinear shock wave in an ideal fluid. In nonlinear acoustics, the wave speed of different segments of a waveform is different, which causes distortion in the waveform and can result in the formation of a shock (discontinuity). Acoustic pressure of high-intensity waves causes particles in the ideal fluid to vibrate forward and backward, and this disturbance is of relatively large magnitude due to high-intensities, which leads to nonlinearity in the waveform. In this research, this vibration of fluid due to the intense ultrasonic wave is modeled as a fluid pushed by one complete cycle of piston. In a piston cycle, as it moves forward, it causes fluid particles to compress, which may lead to the formation of a shock (discontinuity). Then as the piston retracts, a forward-moving rarefaction, a smooth fan zone of continuously changing pressure, density, and velocity is generated. When the piston stops at the end of the cycle, another shock is sent forward into the medium. The variation in wave speed over the entire waveform is calculated by solving a Riemann problem. This study examined the interaction of shocks with a rarefaction. The flow field resulting from these interactions shows that the shock waves are attenuated to a Mach wave, and the pressure distribution within the flow field shows the initial wave is dissipated. The developed theory is applied to waves generated by 20 KHz, 500 KHz, and 2 MHz transducers with 50, 150, 500, and 1500 W power levels to explore the effect of frequency and power on the generation and decay of shock waves. This work enhances the understanding of the interactions of high-intensity ultrasonic waves with fluids.





Author(s):  
M.A. Mogilevsky ◽  
L.S. Bushnev

Single crystals of Al were loaded by 15 to 40 GPa shock waves at 77 K with a pulse duration of 1.0 to 0.5 μs and a residual deformation of ∼1%. The analysis of deformation structure peculiarities allows the deformation history to be re-established.After a 20 to 40 GPa loading the dislocation density in the recovered samples was about 1010 cm-2. By measuring the thickness of the 40 GPa shock front in Al, a plastic deformation velocity of 1.07 x 108 s-1 is obtained, from where the moving dislocation density at the front is 7 x 1010 cm-2. A very small part of dislocations moves during the whole time of compression, i.e. a total dislocation density at the front must be in excess of this value by one or two orders. Consequently, due to extremely high stresses, at the front there exists a very unstable structure which is rearranged later with a noticeable decrease in dislocation density.



1998 ◽  
Vol 94 (5) ◽  
pp. 809-814 ◽  
Author(s):  
C. BARRIO ◽  
J.R. SOLANA


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