THERMAL SCIENCE

International Scientific Journal

A. Mickovska

,

Zvonimir A. Kostić

,

Valentino M. Stojkovski

,

Aleksandar T. Nošpal

DETERMINATION OF THE BUBBLE DIAMETER IN THE PRE-ERUPTION REGION OF THE FLUIDIZED BED

ABSTRACT
The experimental determination of the bubble diameter is performed in two-dimensional bed with annular cross section, in the bubble pre-eruption region using video-based method. The results showed that the average bubble diameter in the pre-eruption region is increasing with the increase of the total number of fluidization, and it is not influenced by the composition of the binary mixture. Based on the experimental research,new empirical equation for estimation of the bubble diameter in the pre-eruption region is developed. Fluidization regime was characterized using fluidization number defined as ratio of superficial gas velocity and minimum fluidization velocity. The minimum fluidization velocity of the mixture is defined in two ways: as apparent minimum fluidization velocity umf-p and total minimum fluidization velocity Umf - T. Respectively, for description of the fluidization regime, apparent and total number of fluidization are defined as a ratio between the superficial gas velocity and minimum fluidization velocity: Uf/Umf-P and Uf/Umf-T.
PAPER SUBMITTED: 1998-04-09
PAPER REVISED: 1998-05-13
PAPER ACCEPTED: 1998-12-16
PUBLISHED ONLINE: 2020-09-20
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 1998, VOLUME 2, ISSUE Issue 1, PAGES [57 - 70]
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DETERMINATION OF THE BUBBLE DIAMETER IN THE PRE-ERUPTION REGION OF THE FLUIDIZED BED

© 2024 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence