期刊
EXPERIMENTAL THERMAL AND FLUID SCIENCE
卷 44, 期 -, 页码 883-892出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.expthermflusci.2012.10.004
关键词
Fluidization; Gas to particle; Infrared measurement; Particle temperature; Spouted bed; Transient heat transfer
资金
- Virginia Tech Institute for Critical Technology and Applied Science (ICTAS)
Heat transfer characteristics of fluidized particles were experimentally quantified through measuring emitted infrared radiation. The presented experimental technique was designed to overcome the spatial, time varying, and instrumental intrusive limitations often found in multiphase flow studies. A pseudo two-dimensional bed was investigated by supplying a thermo-transient inlet gas temperature to fluidized, spouted, and fixed bed regimes. The highest rates of energy stored in the particles were found along the downward particulate entrainment zones surrounding the inlet gas channel. Gas-to-particle heat transfer coefficients in the spouted regime were computed per bed axial position. The resulting values found in the lower portion of the spout were in close comparison to the averaged gas-to-particle heat transfer coefficient empirical correlations found in literature. New findings are given on the high convective heat transfer coefficients in the spout fountain region, resulting from the highly turbulent nature of gas-solid mixing. (C) 2012 Elsevier Inc. All rights reserved.
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