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Numerical calculations of the gas fraction and the liquid flow velocity in round bubble plumes
Author(s) -
Xie Yongkun,
Oeters Franz
Publication year - 1992
Publication title -
steel research
Language(s) - English
Resource type - Journals
eISSN - 1869-344X
pISSN - 0177-4832
DOI - 10.1002/srin.199200491
Subject(s) - buoyancy , bubble , mechanics , flow (mathematics) , mass fraction , chemistry , thermodynamics , die (integrated circuit) , physics , materials science , nanotechnology
A numerical calculation model to determine the vertical variations of the gas fraction and of the liquid flow velocity in bubble plumes is presented. The fundamental functions of the model are the expressions for the mass conservation and the momentum transfer between gas bubbles and liquids. The numerical calculations took place for the blowing conditions under which experimental studies at the system nitrogen/Wood's metal had been carried out. The parameters involved in the model calculations were systematically varied, in order to find out their influence on the results of the calculations. The results showed that by a suitable choice of these parameters the measured data can be well described by the model. Moreover, it was confirmed that the buoyancy force of the gas bubbles is the decisive magnitude for the liquid flow velocity. In comparison, the inertial force of the gas stream at the gas outlet has only a slight influence.