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Schematic of a fiber-based frequency domain OCT: a wide spectrum was sampled by a InGaAs detector array at . Imaging depth and depth resolution were and in air, respectively. Single- and dual-beam probes were used. The dotted line indicates the dual-beam probe which is based on a Wollaston prism. A glass capillary with an inner diameter was tilted by . Two-phase flow was generated at a Y junction. LCL, low-coherence light; CM, collimator; DG, diffraction grating; FL, focusing lens; WP, Wollaston prism; and LSC, line scan camera.
Structural images recorded for with the single-beam probe. The coordinates and mean depth and time: (a) , ; (b) , ; (c) , ; (d) , ; (e) , ; (f) , ; (g) , ; and (h) , .
(Color) Structural image (a) and liquid velocity projected on the incident beam direction [(b) and (c)] with the dual-beam probe. The distance between two arrows indicates the shifted time, corresponding to bubble velocity. The flow was quasi-steady-state. Superficial gas and liquid velocities were 5.88 and , respectively. Toroidal vortices were observed and the mean velocity of bulk liquid far from the vortices was with 1.5° tube inclination. (c) is an enlargement of the left portion of (b).
Variation of two-phase flow parameters with different combinations of and .
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