论文部分内容阅读
通过对已有各种两相湍流传质理论的剖析，指出颗粒与流体间相对速度的大小是确定传质系数的关键。通过分析湍流场中粒子的运动，认为在不同尺度涡旋中，液固间的相对速度是不同的，传质系数也不相同，提出用能谱加权的方法求取总传质系数。以此为基础得到的模型与本文及文献中不同体系的实验结果比较后发现，在流速、粒径、粒子密度、温度、浓度、管径等条件变化较大的情况下，模型均能较好地预测传质系数的变化规律
Through the analysis of all kinds of two-phase turbulent mass transfer theories, it is pointed out that the relative velocity between particle and fluid is the key to determine the mass transfer coefficient. By analyzing the motion of particles in the turbulent flow field, it is considered that the relative velocities between liquid and solid are different at different scales and the mass transfer coefficients are also different. The total mass transfer coefficient is proposed by energy spectrum weighting. The model obtained on this basis is compared with the experimental results of different systems in this paper and in the literature and found that the model can be better under the conditions of large changes in the flow rate, particle size, particle density, temperature, concentration, diameter and other conditions Predict the change rule of mass transfer coefficient