(494f) Hydrodynamics of Gas-Liquid Bubbly Flow at High Pressure and Temperature

Hydrodynamics
of gas-liquid bubbly flow at high pressure and temperature

Zhen Tian, Youwei Cheng^*,
Lijun Wang and Xi Li.

Department
of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027,
PR China

ABSTRACT:

An experiment study on free-bubbling gas
liquid (nitrogen-silicone oil) vertical flow was developed using a
non-intrusive image analysis technique. Experiments were conducted in a 50mm
diameter bubble column with a single orifice and perforated pipe for pressures
as high as 6MPa and temperature ranging from 293 to 523K. Pressure and
temperature affect the bubble rise velocity mainly by varying physical
properties of the fluids. The viscosity of the silicone oil was ranging from
0.005 to 0.3Pa.s, and the surface tension was ranging from 0.011 to 0.21N/m,
which means that the range of Re of this study was from 0.1 to 700. In this
study, the effects of pressure and temperature on the individual bubble rise
velocity and the shape of bubble were firstly studied where the diameter for
bubble ranged from 2mm to 16mm, and then, the dynamic of a pair of approximate equal-sized
gas bubbles rising in vertical line was studied. The effect of pressure,
temperature and bubble diameter on the changes in the shape of the two bubble
interface and the accelerated velocity of the trailing bubble were illustrated
during the approaching process.