Resumo (PT):
Abstract (EN):
Organic matter deposition on internal surfaces constitutes a drawback that impairs the efficiency of several industrial
processes. To overcome this problem, sparging a train of bubbles could be useful since its presence strongly increases
the wall shear stress. A detailed numerical mass-transfer study between a finite soluble wall and the liquid around a rising Taylor bubble was performed, simultaneously solving velocity and concentration fields. The bubble passage throws
solute backward and is responsible for radial dispersion. There is also an increase in the transfer rate with enhancements between 10 and 20% (depending on liquid average velocity and bubble length) compared to single-phase flow.
Mass-transfer coefficients along the different hydrodynamic regions around the bubble nose, liquid film, and wake were
characterized and their values compared with those from literature. The results suggest a promising potential of bubble
train flow to enhance organic matter removal from walls in biological systems.
Idioma:
Inglês
Tipo (Avaliação Docente):
Científica
Nº de páginas:
20