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Numerical computation of flow phenomena in gas‐stirred ladle systems
Author(s) -
Balaji Devulapalli,
Mazumdar Dipak
Publication year - 1991
Publication title -
steel research
Language(s) - English
Resource type - Journals
eISSN - 1869-344X
pISSN - 0177-4832
DOI - 10.1002/srin.199101721
Subject(s) - mechanics , ladle , flow (mathematics) , plume , computation , bubble , volume (thermodynamics) , slippage , convergence (economics) , mathematics , thermodynamics , materials science , physics , engineering , mechanical engineering , algorithm , economics , composite material , economic growth
Quasi‐single‐phase mathematical models as applied to the ladle hydrodynamics have been analysed rigorously. It is shown that choice of convergence criteria, nodal configuration and differencing schemes all influence the computed results significantly and consequently, results independent of these numerical parameters must first be established to draw any useful conclusion. Several quasi‐single‐phase computational procedures reported in the literature to study the gas‐injection‐induced flow phenomena have been critically examined. To this end, experimentally measured bulk flow‐fields, plume‐rise velocity and gas voidages have been compared with those predicted numerically. Such comparisons indicate that the bottom injection phenomena (viz., bulk flow, plume‐rise velocity, and gas volume fraction within the plume etc.) can be adequately represented by assuming bubble slippage and considering a constant rise velocity in the two‐phase region in the numerical solution scheme.