Prediction of gas-particle dynamics and heat transfer in a two-dimensional spouted bed
Prediction of gas-particle dynamics and heat transfer in a two-dimensional spouted bed
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DOI：
10.1163/1568552053750215
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发表时间：
2005
影响因子：
5.2
通讯作者：
Thanit Swasdisevi;W. Tanthapanichakoon;T. Charinpanitkul;Toshihiro Kawaguchi;Toshitsugu Tanaka;Y. Tsuji
中科院分区：
文献类型：
--
作者：
Thanit Swasdisevi;W. Tanthapanichakoon;T. Charinpanitkul;Toshihiro Kawaguchi;Toshitsugu Tanaka;Y. Tsuji
摘要采用离散单元法（DEM）对二维导流板喷动床内气固传热过程进行了数值模拟。颗粒的物理性质与带壳玉米的物理性质相似。计算得到的最小喷动速度和压降与Kudra等人提出的经验关系式吻合较好，颗粒循环速率随摩擦系数的减小或分离高度的增加而增大。导流板可以降低最小喷动速度和压降。它们还增加了最大可喷床高度。研究了拔出导流板对喷动现象的影响。无导流板的2DSB对10000个颗粒的混合效果优于26000个颗粒的混合效果。在我们的模拟中，研究了气体到颗粒的传热。Ranz-Marshall关联式和Sartori等人的关联式分别适用于喷动区和降液管区。根据Freitas和Freire的报告，气固传热主要发生在中心或喷口区域。
Abstract The aerodynamics of particles and heat transfer of gas-to-particles in a two-dimensional spouted bed (2DSB) with draft plates are investigated by the discrete element method (DEM). The physical properties of the particles are similar to those of shelled corn. The calculated minimum spouting velocity and pressure drop agree well with the empirical correlations proposed by Kudra et al. The particle circulation rate increases when the friction coefficient decreases or the separation height increases. The draft plates can reduce the minimum spouting velocity and pressure drop. They also increase the maximum spoutable bed height. The effect of taking out the draft plates on the spouting phenomenon is investigated. The mixing of a 2DSB without draft plates of 10 000 particles is better than that of 26 000 particles. In our simulation, the gas-to-particle heat transfer is investigated. The Ranz–Marshall correlation and the correlation of Sartori et al. are applicable in the spout region and the downcomer region, respectively. The gas-to-particle heat transfer occurs mainly in the central or spout region, as reported by Freitas and Freire.