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Magnetic resonance imaging of gas–solid fluidization with liquid bridging
Author(s) -
Boyce C. M.,
Penn A.,
Pruessmann K. P.,
Müller C. R.
Publication year - 2018
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.16036
Subject(s) - fluidization , wetting , bubble , mechanics , dissipation , cohesion (chemistry) , surface tension , viscosity , bridging (networking) , particle (ecology) , chemistry , materials science , fluidized bed , thermodynamics , composite material , physics , geology , computer network , oceanography , organic chemistry , computer science
Magnetic resonance imaging is used to generate snapshots of particle concentration and velocity fields in gas–solid fluidized beds into which small amounts of liquid are injected. Three regimes of bed behavior (stationary, channeling, and bubbling) are mapped based on superficial velocity and liquid loading. Images are analyzed to determine quantitatively the number of bubbles, the bubble diameter, bed height, and the distribution of particle speeds under different wetting conditions. The cohesion and dissipation provided by liquid bridges cause an increase in the minimum fluidization velocity and a decrease in the number of bubbles and fast particles in the bed. Changes in liquid loading alter hydrodynamics to a greater extent than changes in surface tension or viscosity. Keeping U/U mf at a constant value of 1.5 produced fairly similar hydrodynamics across different wetting conditions. The detailed results presented provide an important dataset for assessment of the validity of assumptions in computational models. © 2017 American Institute of Chemical Engineers AIChE J , 64: 2958–2971, 2018