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Liquid Flow nearby Tip of Progressive Gas in A Horizontal Tube.
Japanese At gas-liquid two phase flow in heated
tube wall of pipe lines such nuclear reactor,
heat exchanger and chemical plant, a liquid
is vaporizing because of heating, the liquid
is running out in the end and the tube wall
is directly heated. If the heating gose on
at this rate, it will be very dangerous state
that the tube is melted and breaked.(This
phenomenon is called "burnout"
in techical term.)
So, in our study, as basic research of
such the heat transfer phenomenon, we aim
for an improvement in the safety by studying
the relation ship between the velocity in
the tube, the thickness of residual liquid
film in the wall and the shape of the tip
of the bubble.
We are shooting the shape of the tip of
the bubble with high speed video camera and
are analyzing the gas-liquid interfase (free
surfase) using finite element method (FEM),
for clearing relathionship between the velocity
of the tip of the bubble in the tube and
the shape of its.
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