| ISBN: 3540667342
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| description |
This paper presents numerical simulations and experimental studies
on the fluid-dynamic behaviour of rising bubbles in stagnant and
flowing liquids in a vertical straight duct of rectangular
cross-section. The bubbles were generated by injecting air through
an orifice of the side-wall. Experimental data were obtained for
various liquid flow velocities in order to assess the impact of the
stream conditions on the bubble characteristics. The bubble size,
their rising behaviour as well as the bubble velocity were
investigated systematically using high-speed cinematogaphy. The
velocity field in the vicinity and the wake of the rising bubbles
was measured by means of the Laser Doppler velocimetry to quantify
the local structure of the liquid flow in the presence of rising
bubbles. According to the experimental configuration and the
obtained data numerical calculations have been performed. For these
numerical computations, a model for the bubbles was added to a
solver for the incompressible Navier-Stokes equations. This model
captures the motion of the bubbles, yet omits details of their
shape. The results of the experimental study show the complexity of
the bubble dynamics in superimposed liquid flow. Experimental data
obtained for stagnant liquid compare well with the numerical
predictions.
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| publisher |
Springer
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| type |
Text
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| Article in Book
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| source |
In: Bungartz, H.-J. (ed.); Hoppe, R.H.W. (ed.); Zenger, C. (ed.):
Lectures on Applied Mathematics, pp. 297-320
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| contributor |
IPVS, Simulation großer Systeme
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| Hans-Joachim Bungartz
| subject |
Simulation and Modeling (CR I.6)
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