论文部分内容阅读
利用计算流体力学(CFD)技术,以管式炭膜膜蒸馏氯化钠水溶液过程中膜内流体为研究对象,在实验研究的基础上,基于标准k-ε湍流模型,建立了描述膜内液体的流体动力学模型,考察了温度、流量及浓度等参数对渗透通量的影响,发现渗透通量随着料液温度与流量的增大而增大、随着料液浓度的增大而减小,而且料液温度是影响渗透通量的主要因素。模拟计算值与实验值的良好吻合证明了模型的可靠性。在此基础上,利用FLUENT软件对膜管内侧流体进行模拟研究,得到了膜管内侧流体速度、温度及剪应力的分布规律。利用本文建立模型能够对膜蒸馏过程的流场及温度场分布进行模拟,得到直观性更强的参数分布规律描述,为膜蒸馏过程的理论研究和工业化应用提供依据。
Based on the experimental study, based on the standard k-ε turbulence model, a new method to describe the in-membrane liquid was developed by using computational fluid dynamics (CFD) The effects of temperature, flow rate and concentration on the permeate flux were investigated. It was found that the permeate flux increased with the increase of feed temperature and flow rate and decreased with the increase of feed concentration Small, and feed liquid temperature is the main factor affecting the permeate flux. The good agreement between the calculated value and the experimental data proves the reliability of the model. On the basis of this, the FLUENT software was used to simulate the fluid inside the membrane and the distribution of fluid velocity, temperature and shear stress inside the membrane was obtained. The model established in this paper can simulate the distribution of flow field and temperature field in the membrane distillation process, and get the more intuitive description of the parameter distribution, which provides the basis for theoretical study and industrial application of membrane distillation.