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采用数值计算和实验验证相结合的方法研究液固脉冲流化床中浓度波的传播和衰减. 当脉冲开半周期T2和闭半周期T1都远大于颗粒弛豫时间tp时,两相的惯性力之差在一个周期的绝大部分时间中相对于重力很小,可忽略,这时由双流体模型的动量方程可推导出推广的RichardsonZaki公式,双流体模型简化为局部平衡模型. 采用五阶精度WENO格式求解浓度波传播方程,得到了脉冲流化过程中浓度波传播与衰减的规律,与实验结果符合良好.
The propagation and attenuation of concentration wave in liquid-solid pulsed fluidized bed are studied by the combination of numerical calculation and experimental verification.When the pulse half-period T2 and the half-period T1 are both far greater than the particle relaxation time tp, the inertia The difference between forces is negligible with respect to gravity for most of the time of one cycle. In this case, the extended Richardson-Zaki formula can be deduced from the momentum equation of the two-fluid model, and the two-fluid model can be simplified as the local equilibrium model. The WENO format is used to solve the wave propagation equation of concentration wave, and the law of the propagation and attenuation of the wave in the pulse fluidization process is obtained, which is in good agreement with the experimental results.