PTV investigation of phase interaction in dispersed liquid–liquid two-phase turbulent swirling flow |
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Authors: | Atsuhide Kitagawa Yoshimichi Hagiwara Takuro Kouda |
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Institution: | (1) Department of Mechanical and System Engineering, Kyoto Institute of Technology, Goshokaido-cho, Matsugasaki, Sakyou-ku, Kyoto 606-8585, Japan;(2) Hiroshima Machinery Works, Mitsubishi Heavy Industries, Ltd, Kannonshinmachi, Nishi-ku, Hiroshima 733-8553, Japan |
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Abstract: | An investigation of dispersed liquid–liquid two-phase turbulent swirling flow in a horizontal pipe is conducted using a particle
tracking velocimetry (PTV) technique and a shadow image technique (SIT). Silicone oil with a low specific gravity is used
as immiscible droplets. A swirling motion is given to the main flow by an impeller installed in the pipe. Fluorescent tracer
particles are applied to flow visualization. Red/green/blue components extracted from color images taken with a digital color
CCD camera are used to simultaneously estimate the liquid and droplet velocity vectors. Under a relatively low swirl motion,
a large number of droplets with low specific gravity tend to accumulate in the central region of the pipe. With increasing
droplet volume fraction, the liquid turbulence intensity in the axial direction increases while that in the wall-normal direction
decreases in the central region of the pipe. In addition, the turbulence modification in the present flow is strongly dependent
on the droplet Reynolds number; however, the interaction of droplet-induced turbulences is significant due to vortex shedding,
particularly at high droplet Reynolds numbers and higher droplet volume fraction. |
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