FIG. 7.

Pressure difference between two dispersed flows in term of time for (a) Ca = 0.04, (b) Ca = 0.06, (c) Ca = 0.08 with wf = 0.2 and λ = 1.0 fixed for all cases. Δp is calculated by subtracting pressure at measurement point P1 from P2 shown in Fig. 1. Highlighted smooth curves are fitted by wave function from forth droplet after alternating occurrence. The amplitude (A) and half period (T/2) of wave functions corresponding to Ca = 0.04, 0.06, and 0.08 are A = 34.26, 24.71, and 19.38 and T/2 = 4.07, 3.28, and 2.9, respectively.