Development of the numerical method of solid-fluid multiphase flows using the lattice Boltzmann method

为了研究具有较大固体颗粒的固体-流体混合物的流动和传质传热问题，本文提出了一种新的计算固体-流体混合物流动和传质传热的数值方法——晶格玻尔兹曼法。其次，通过计算和现有的实验数据，研究了固液混合物的流动特性和传质传热特性。本研究的结果如下：1。采用点阵玻尔兹曼方法，提出了一种新的固流混合流动数值计算方法。平行壁面间含柱状颗粒流动的计算结果与实验结果吻合较好。将含球颗粒流的计算结果与实验结果进行了比较，验证了该方法的准确性。阐明了颗粒直径与管道高度之比、颗粒体积分数、流速等参数对混合气流动的影响。利用二元流体混合物的晶格玻尔兹曼方法，建立了一种新的固体-流体混合物传质传热数值计算方法。计算了球形颗粒与二元流体混合物的传质过程，并与实验进行了比较，验证了该方法的准确性。阐明了上述参数对传质传热的影响。

In order to investigate the flow and the mass/heat transfer of solid-fluid mixtures which have relatively large solid particles, we developed a new numerical method for the calculation of the flow and the mass/heat transfer of the solid-fluid mixtures by using the lattice Boltzmann method. Next, we studied the characteristics of the flow and the mass/heat transfer of the solid-fluid mixtures by the computations and the available experimental data. The results of this study are as follows.1. A new numerical method for solid-fluid mixture flows is developed by using the lattice Boltzmann method.2. The calculated results of flows containing cylinder particles between parallel walls agree well with experiments.3. The calculated results of flows containing sphere particles through a duct are compared with experimetns to verify the accuracy of the method.4. The effect of the parameters (the ratio of particle diameter to duct hight, the volume fraction of particles, and the flow speed) on the mixture flow is clarified.5. A new numerical method for mass/heat transfer of solid-fluid mixtures is developed by using the lattice Boltzmann method for binary fluid mixture.6. The mass transfer of the mixture of sphere particles and binary fluid is calculated and compared with experiments to verify the accuracy of the method.7. The effect of the above parameters on mass/heat transfer is clarified.