Voidage Profiles in a Slot‐Rectangular Spouted Bed

Abstract

Local voidages were determined using optical fibre probes for 1.4 and 2.4 mm glass beads in slot‐rectangular spouted beds of width 150 mm. The effects of air inlet flow rate, slot width and bed thickness were investigated. Spout widths were determined from standard deviations of local voidage fluctuations. Both spout and annulus voidages increased with increasing air flow. Annulus voidages were usually higher than corresponding loose‐packed voidages and decreased with increasing height. Annulus and spout voidages were very sensitive to the air entry slot width and particle diameter. With increasing height, spouts became increasingly circular (three‐dimensional), despite the initial rectangular geometry.

Investigation of nonuniformity in a liquid–solid fluidized bed with identical parallel channels

“…They applied this technique to measurements in a high‐density circulating fluidized‐bed riser. Others in our laboratory (e.g., Freitas et al,17 Wang,18 and Chen19) have successfully deployed optical fiber probes in a variety of systems. Therefore, optical fiber probes were used in the present work.…”

Hydrodynamic investigation of gas-solid flow in rectangular spout-fluid bed using CFD-DEM modeling

“…Passos et al [15] thickness-to-width ratio, which should be considered in the scale-up process. Freitas et al [19] indicated similarity between slot-rectangular and conventional spouted beds in voidage profiles…”

Numerical and experimental investigation of hydrodynamic characteristics of a slot‐rectangular spouted bed

“…Freitas et al identified different flow regimes in a slot‐rectangular spouted bed based on pressure fluctuations. Freitas et al studied related profiles of voidage in a SRSB by means of an optical fibre probe. Both spout and annulus voidages increased with increasing air flow, and the spouts became nearly circular as the static bed height increased, despite the rectangular column and slot geometry.…”