Abstract:
The flow of oil and water in pipes represents a challenging
configuration in multiphase flows due to complex hydrodynamics
which are still not fully understood. This can be observed in the
large number of flow regimes encountered, which extend from
smooth stratified flows to complex dispersions such as droplets of
oil-in-water and water-in-oil. These flow configurations are the
result of the inherent properties of the liquid phases, e.g., their
densities and viscosities, interfacial tension and contact angle, as
well as of flow conditions and related phenomena, such as
turbulence, which have a direct effect on the interface instabilities
giving rise to flow regime transitions. In this paper, experimental
data are reported that were acquired at low water cuts and low
mixture velocities using an aliphatic oil (Exxsol D140) and water
as the test fluids in an 8.5 m long and 32 mm internal diameter
horizontal pipe. A copper-vapour laser, emitting two narrow-band
laser beams, and two high-speed cameras were used to obtain
quantitative simultaneous information of the flow (specifically,
spatiotemporally resolved fluid-phase and velocity information in
both phases) based on simultaneous two-line Planar Laser-Induced
Fluorescence (PLIF) and Particle Image and Tracking Velocimetry
(PIV/PTV). To the best knowledge of the authors this is the first
such instance of the application of this combined technique to
these flows. It is found that the rms of the fluctuating velocity
show peaks in high shear regions, i.e. at the pipe wall and interface.
Description:
Papers presented to the 12th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Costa de Sol, Spain on 11-13 July 2016.
