摘要
在气固两相流多尺度模拟的确定性颗粒轨道模型中,相间耦合关系及颗粒曳力计算对模拟结果具有举足轻重的影响。基于简化的硬球模型,运用不同的相间耦合关系及曳力公式对气固流化床进行了模拟。研究结果表明:在确定性颗粒轨道模型中,应该基于颗粒群的曳力计算进行相间耦合,且基于Wen和Yu以及DiFelice的曳力公式能够较好地模拟鼓泡流化床和循环流化床的基本流动特征;而基于双流体模型建立相间耦合关系及进行颗粒曳力计算的正确性尚需进一步研究。
Different coupling relations between phases and way of calculating drag forces used to simulate gas-solid fluidized beds, are based on the simplified hard-sphere model. Results indicate that for deciding on the particle-trajectory mode coupling between phases should be based on the calculation of drag forces on an aggregate of particles and the formula of Wen and Yu or the formula of Di Felice can well present the basic flow characteristics of the bubbling bed and the circulating fluidized bed. However, further work is required to clarify whether both the coupling relationship and the calculation of drag forces based on the two-fluid model are acceptable. Figs 4, tables 2 and refs 12.
出处
《动力工程》
CSCD
北大核心
2004年第6期857-862,共6页
Power Engineering
基金
陕西省自然科学基金(2001SL12)
中国科学院多相反应开放实验室基金
关键词
工程热物理
气固两相流
模拟
流化床
多尺度
engineering thermophysics
gas-solid two-phase flow
simulation
fluidized bed
multidimensional
