An extended version of the countercurrent back-mixing model suitable for solid mixing in two dimensional fluidized beds

The potential use of fluidized bed combustion of coal as a means of meeting air quality standards with high-sulfur fuels has motivated the development of theoretical models of heat transfer in large particle gas fluidized beds. Models of the separate contributions of emulsion and bubble phase heat transfer have been developed by Adams and Welty [1] and Adams [2, 3, 4] and have been substantiated by experimental data for a horizontal tube immersed in a two-dimensional cold bed obtained by Catipovic [5, 6]. The consolidation of these models to predict local and overall time-average heat transfer to immersed surfaces requires information regarding emulsion phase residence time and bubble phase contact fraction for the particular geometry of interest. The analytical procedure to consolidate these models is outlined in the present work, then applied to the case of a horizontal tube immersed in a two-dimensional atmospheric pressure cold bed. Measurements of emulsion phase residence time and bubble phase contact fraction obtained by Catipovic [5] are used in the calculations for particle diameters ranging from 1.3 to 6 mm. The results agree favorably with experimental data and further substantiate the fundamental assumptions of the model.

Download Full-text

Mixing of large particles in two-dimensional gas fluidized beds

The Canadian Journal of Chemical Engineering ◽

10.1002/cjce.5450570114 ◽

1979 ◽

Vol 57 (1) ◽

pp. 88-97 ◽

Cited By ~ 16

Author(s):

L. T. Fan ◽

Y. Chang

Keyword(s):

Fluidized Beds ◽

Two Dimensional ◽

Large Particles ◽

Gas Fluidized Beds

Download Full-text

Solid circulation rate and particle collisions in quasi two-dimensional water fluidized beds of spherical particles

Powder Technology ◽

10.1016/j.powtec.2013.11.038 ◽

2014 ◽

Vol 253 ◽

pp. 295-303 ◽

Cited By ~ 4

Author(s):

Tatjana Kaluđerović Radoičić ◽

Mihal Đuriš ◽

Radmila Garić-Grulović ◽

Zorana Arsenijević ◽

Željko Grbavčić

Keyword(s):

Fluidized Beds ◽

Spherical Particles ◽

Circulation Rate ◽

Two Dimensional ◽

Particle Collisions ◽

Solid Circulation Rate

Download Full-text

Textured Multiferroics: 2-D Diffraction and Properties Prediction

Materials Science Forum ◽

10.4028/www.scientific.net/msf.702-703.1007 ◽

2011 ◽

Vol 702-703 ◽

pp. 1007-1010

Author(s):

Alejandro Muñoz-Romero ◽

L. Fuentes-Montero ◽

M.E. Montero-Cabrera ◽

U. Trivedi ◽

Luis E. Fuentes-Cobas

Keyword(s):

Thin Films ◽

Software Package ◽

Electromagnetic Properties ◽

Research Centre ◽

Two Dimensional ◽

Extended Version ◽

Structured Materials ◽

Materials Properties ◽

Nanotechnology Education ◽

Texture Characterization

A description of recent work performed by collaboration among the CIMAV Crystal Physics Group, the ILL Diffraction Group and the GEC Nanotechnology Education and Research Centre (NERC), regarding structure-electromagnetic properties relationships, is given. Structure analysis puts emphasis on thin films texture characterization. The new software package ANAELU, for texture analysis via two-dimensional (2-D) diffraction detection, is described. Crystallographic texture plays a significant role on ferroic and multiferroic bulk and nano-structured materials properties. With the objective of estimating effective values for polycrystal dielectric, piezoelectric, elastic and magnetoelectric coefficients, the Voigt, Reuss and Hill approximations are systematized in an extended version of program SAMZ.

Download Full-text