Figure 12.

(a) Pressure distribution $p\left(x,t\right)$ along the channel length at three different times $t$ = 100, 1000, and 2000 s during the experimental run, which correspond to pressure ratios $\mathsf{\Pi }$ = 3.8 (O), 5.5 (◁), and 6.2 (☐). The dashed lines represent the linear pressure distributions when rarefaction and compressibility effects are neglected; (b) time evolution of pressure ratio $\mathsf{\Pi }$ during the experimental run.