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• W2040244907 abstract "Several types of submersible probes have been employed in the measurement of bubble velocity and size in gas-fluidized beds. Dual-tipped probes can measure only the pierced length of a bubble, since the central axis of the rising bubble need not be aligned with that of the probe. The distribution of the measured pierced lengths is then used to deduce, from geometrical probability procedures, the distribution of bubble diameters if the shape of the bubble is known. However, the signal interpretation methods used for such probes invariably assume that all bubbles rise vertically. From observations in a two-dimensional bed, it appears that bubbles move in an intricate pattern influenced both by other bubbles in the vicinity as well as the local solids flow pattern; the assumption of vertical bubble rise clearly needs further examination. Multiple-tipped probes have also been used; the data collection algorithms for such probes contain criteria which detect and reject the non-vertically rising bubbles. Whether such selection methods influence the measured statistics of bubble populations does not appear to have been established. In this study, it is first shown from theory that the angle of bubble rise (or incidence at a submerged probe) must be taken into account in signal interpretation procedures. Significant errors can result if signals from non-vertically rising bubbles incident at a dual-tipped probe are interpreted using conventional methods. Bubble size/ shape, velocity and the angle of rise are then measured in a two-dimensional gas-fluidized bed using digital image analysis methods. These measurements enable experimental assessment of the limitations of dual-tipped probes. The measurements are further analysed to determine whether the rejection of the non-vertically rising bubbles leads to discrepancies between the actual bubble characteristics and those measured by multiple-tipped probes. The simultaneous measurements also permit investigation of the relationship between bubble size/shape and velocity in a two-dimensional bed. Additional experiments have been performed to compare such relationships for bubble swarms in a freely bubbling fluidized bed with those for single bubbles and bubble chains injected in an incipiently fluidized bed." @default.
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• W2040244907 date "1992-03-01" @default.
• W2040244907 modified "2023-09-26" @default.
• W2040244907 title "Bubble velocity in fluidized beds: The effect of non-vertical bubble rise on its measurement using submersible probes and its relationship with bubble size" @default.
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• W2040244907 doi "https://doi.org/10.1016/0032-5910(92)80015-o" @default.
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