Fig. 2

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A typical CAD construction of the proposed pipe models of height 3.2 m and inner diameters (a) 0.04 m, (b) 0.06 m, (c) 0.075 m and (d) 0.09 m. S1, S2, S3 and S4 are the axial positions of the reference slits corresponding to location of the actual pressure sensors placed on the physical experimental rig.