Shockwave reflection

Many more CTD simulations at the microscale exist and the numerical reproduction of the behavior of pressure-driven flows in microchannels has been obtained often [2, 10]. Some discrepancies have been found between numerical solutions of the Navier-Stokes equations and experimental data obtained in viscosity-dominated shock tube investigations. It was noticed that even using fine grid cells of a few micrometers, the solution of the Navier-Stokes equations still does not match experimental data of shockwave reflection transition over a wedge [2]. It has been pointed out that the solution of shockwave motion at low Reynolds... 

These IR complex index component spectra were used to calculate the spectral effects that would be observed in a shock compression experiment. Figure 12 shows the time-dependent IR reflectance spectra calculated for normal incidence and p polarization in a 1 pm thick PMMA film during passage of the shockwave, assuming no pressure shift of the band frequencies. The uniaxial shock compression ratio fVE = l/(l-Up/us) was 1.5, as expected for... 

It will be clear that little can be said about the character of the initiation process. Photothermal, mechanical and photochemical processes may contribute to the initiation process. Reflection of the shockwave, by the wall of the sample holder, can be important too. Evidence of this to play a role is the successful initiation of mercury fulminate in one sample holder, while it cannot be initiated in another, with the irradiation conditions being the same. 

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