Spatially resolved measurement of anisotropic granular temperature in gas-fluidized beds

被引:72
作者
Holland, D. J. [1 ]
Mueller, C. R. [1 ]
Dennis, J. S. [1 ]
Gladden, L. F. [1 ]
Sedennan, A. J. [1 ]
机构
[1] Univ Cambridge, Dept Chem Engn, Cambridge CB2 3RA, England
基金
英国工程与自然科学研究理事会;
关键词
granular temperature; magnetic resonance; fluidized bed; particle velocity;
D O I
10.1016/j.powtec.2007.06.030
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
This paper reports the measurement of granular temperature in gas-fluidized beds using magnetic resonance. Experiments were performed using 0.5 and 1.2 mm diameter particles (Geldarts group B and D) in both a 3-dimensional cylindrical bed and a 2-dimensional rectangular bed. Measurements were performed over a range of motion encoding times to confirm that the experiments were in the ballistic regime. The results confirm that the granular temperature arises from shear induced by the bubble motion. It was found that the hydrodynamics in the 2D and 3D geometries were significantly different with lower bubble velocities but a higher bubble temperature in the 2D bed than in the 3D bed. The granular temperature was also found to be highly anisotropic, with T, up to 10 times greater than T-x or T-y. (C) 2007 Elsevier B.V. All rights reserved.
引用
收藏
页码:171 / 181
页数:11
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