Figure 5.

Influence of Reynolds number on the length of the recirculations formed downstream of the abrupt expansion for the Newtonian fluid (forward flow). The symbols represent experimental data obtained for channels S₁, S₂, and S₃ and the thick solid lines represent the corresponding numerical predictions using the depth of the channel (cf. Table 1). The thin solid lines represent the numerical predictions when the depth of the channel is varied at ±3 μm (upper line: h+3 μm; lower line: h–3 μm).