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. Author manuscript; available in PMC: 2012 Oct 1.
Published in final edited form as: Meas Sci Technol. 2009 Nov 16;21(1):015401. doi: 10.1088/0957-0233/21/1/015401

Figure 8.

Figure 8

Downstream centerline velocity and standard error for single-phase flow on a fixed stage (I) and the air/water system on a translating stage (II). The centerline velocity of the flow is described as U(t) = UM + UΩ sin(ωt) where the time-averaged downstream centerline velocity UM = 12 mm s−1, the frequency ω = 1 Hz and the oscillatory velocity component UΩ = 6 mm s−1. In the two-phase trials, this corresponds to a mean capillary number CaM = 8.1 × 10−5. For the translating stage trial (II), large symbols demarcate points a–d in the cycle further explored in figures 9 and 10.