Correlation between images and electrical signals for determination of bubble diameters in liquids / Correlação entre imagens e sinal elétrico para determinação do diâmetro de bolhas em líquidos

AUTOR(ES)

Marcelo Marinho

DATA DE PUBLICAÇÃO

2006

RESUMO

The distribution of bubble sizes is a critical feature in two–phase systems. The interfacial area of bubbles is strongly related to chemical reaction and mass transfer rates in industrial applications such as distillation and fermentation columns, biological systems, oxidation, hydrogenation, waste water treatment and in natural processes such as aerosol dynamics and air-sea gas transfer. Intrusive probes are widely used to determine bubble size distribution in two-phase bubble columns. Although bubble size cannot be obtained by a simple probe because it measures only the pierced length of the bubbles, it is possible to relate chord distributions to bubble size distribution by the use of statistical analysis. This work proposes a system implementation which is able to determine bubble size distribution in a water-air bubble column using an intrusive conductance probe. Images obtained by a monochromatic video camera CCD (Charge-Coupled Devices) are used to validate and calibrate the system.

ASSUNTO(S)

tamanho de bolhas probes pontas de prova image analysis bubble sizes análise de imagens two-phase flows escoamento bifásico

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