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Voidage distribution around bubbles in a fluidized bed

J. A. Almendros-Ibáñez ; David Pallares (Institutionen för energi och miljö, Energiteknik) ; Filip Johnsson (Institutionen för energi och miljö, Energiteknik) ; D. Santana
Powder Technology (0032-5910). Vol. 197 (2010), 1, p. 73-82.
[Artikel, refereegranskad vetenskaplig]

n this work, a new method for measuring void fraction distribution around endogenous bubbles in a 2D fluidized bed is presented. The technique is based on illuminating a transparent-wall 2-dimensional bed with diffuse light from the rear and recording the distribution of light that penetrates the bed. The recording is made with a high speed video-camera, which gives frames with grey level corresponding to the light penetration and from which the voidage distribution around the bubbles can be determined. In this way, voidage distribution in the region very close to the bubble contour (r/Rb less, approximate 1.2) is obtained, which was not possible in previous studies due to limitations in spatial resolution. A correlation is proposed for the voidage at the contour of the bubble, with the voidage depending on the radial position and the polar angle. In addition, the effect of the voidage distribution on the throughflow crossing the bubbles was studied and an increase of 20% was determined for the average bubble geometry of the more than 100 bubbles analysed.

Nyckelord: Fluidized bed; Voidage; Porosity



Denna post skapades 2010-02-15. Senast ändrad 2013-10-29.
CPL Pubid: 112183

 

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Institutioner (Chalmers)

Institutionen för energi och miljö, Energiteknik

Ämnesområden

Kemisk energiteknik

Chalmers infrastruktur