Abstract
The point properties of bubbling systems have been calculated for various assumed bubble frequency and size distributions. Flat, linear and parabolic radial frequency distributions were considered for both uniform and non-uniform bubble size distributions. The point bubble frequency distribution, which is equivalent to the distribution measured by a probe inserted into the system, may not be representative of the distribution which actually exists in the bed. Due to a boundary effect, the theoretical probe output for larger bubbles is found to yield a peak in the bubble frequency toward the bed centre, even if the actual distribution is flat, the magnitude of the bias increasing as bubble size increases. Caution in using radial frequency profiles obtained by point probe methods is thus indicated.
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