Experimentação física do escoamento gás-líquido em uma coluna de bolhas retangular utilizando a técnica PIV e a técnica de sombras SHADOW / Gas- liquid experimentation in a rectangular bubble column using PIV and Shadow techniques
AUTOR(ES)
Diana Isabel Sánchez Forero
FONTE
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia
DATA DE PUBLICAÇÃO
16/07/2012
RESUMO
Bubble columns are multiphase contact devices for mass and heat transfer, wich are intensively used in different industrial areas. Flow and turbulence in these equipments are induced by the bubble rise motion. The hydrodynamics and bubble behavior in a homogeneous bubbly flow regime was analyzed in a rectangular laboratory-scale bubble column (50 x 20 x 220 cm) using Particle Image Velocimetry (PIV) and Shadow techniques to study continuous and dispersed phase, respectively. The bubble column was aerated by using 18 holes gas sparger for several superficial gas velocities. The flow properties for both phases were determinate by sufficient number of double images. The velocity field for continuous phase (liquid) was achieved by adding fluorescing tracer particles. In addition, turbulence intensities of the fluid, turbulent kinetic energy and tensors profiles were deduced from experimental measurements. Results show typical axial mean velocity profiles of the liquid, upward flow in the core region and a down-flow near the walls. Also, it was found differences between axial and normal tensors profiles that suggest the turbulent phenomena in the bubble column its produced by the anisotropic behavior. Finally the bubble performance was further analyzed by determining bubble distribution and bubble size. It was found a decreasing bubble size along the bubble column due to the coalescence and deformation effects. Furthermore, is determinate that the bubble diameter is around 4 mm, typical bubble size in a homogeneous bubble flow regime.
ASSUNTO(S)
bolhas escoamento multifasico bubble multiphase flow
ACESSO AO ARTIGO
http://libdigi.unicamp.br/document/?code=000871386Documentos Relacionados
- Investigação do escoamento bifásico gás-líquido em uma coluna de bolhas retangular por meio da técnica CFD
- Three-dimensional simulation of gas-liquid in bubble columns
- Modelagem numerica para seguimento dinamico de bolhas em escoamento intermitente horizontal gas-liquido
- Transferência de massa gás-líquido em coluna de aeração
- System board to measures of gas-liquid two-phase flow