Fig. 9

Schematic of the computational domain and pressure distribution to quantify the end effect. A 2D channel with a size of \(L_0\times H\) is connected to two large reservoirs filled with gas maintained at pressures \(p_\text {in}\) and \(p_\text {out}\), respectively. The flow field is simulated on the lower half of the geometry due to symmetry. No bumps are appended to channel surfaces. The distribution of gas pressure along the horizontal center line (dash-dotted line) for \(\alpha =0.1\) is shown in solid red line. End effect causes pressure jump at the inlet/outlet of the channel and can be taken into account by the increment \(\Delta L_0\) to the channel length [33]