Indirect estimation of bubble size using visual techniques and superficial gas rate

• An indirect method to determine the D32 of a bubble size distribution was proposed.
• The model included the percent are (2D) of bubbles in a set of images.
• The model also included the superficial gas rate.
• The linear model was evaluated at laboratory and industrial scales.
• The linear regressions showed a fairly good predictive capacity in both cases.

In this paper, an indirect method for determining the Sauter mean diameter of a bubble population is presented. The technique relies on the estimation of the percent area occupied by bubbles in a 2D image as well as on the superficial gas rate. The percent area was defined as the quotient between the black pixels (bubble representation) divided by the total pixels in a binary image. A linear model to describe the Sauter diameter as a function of the percent area and the superficial gas rate was proposed. The regressions showed a fairly good predictive capacity in laboratory and industrial flotation machines under bubbly regime, which makes the proposed methodology a promising tool for monitoring and controlling gas dispersion in real time.

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