摘要
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。
Computational Fluid Dynamics （CFD） technique was used in describing flow and heat transfer behaviors within a tubular carbon membrane during membrane distillation of sodium chloride （NaCI） aqueous solution on the basis of experiments. The standard k-g model was applied to simulate turbulent flow within the membrane. The effects of feed temperature, flowrate and concentration on the permeate flux were examined. Both simulative and experimental results show that the permeate flux increases with increase in temperature and flowrate, and decreases with concentration. The feed temperature plays a major role in affecting the permeate flux. Comparisons between simulated outcomes and experimental data display good agreements, indicating the reliability and practicability of the model. Meanwhile, the velocity, temperature and shear stress distributions of the fluid in the membrane tube were obtained with FLUENT software. The present study for visualized expression of flow and temperature fields＇ distributions during the membrane distillation process would provide a basis for future theoretical research and industrial application.
出处
《计算机与应用化学》
CAS
CSCD
北大核心
2012年第8期938-942,共5页
Computers and Applied Chemistry
关键词
膜蒸馏
CFD
海水淡化
炭膜
membrane distillation, CFD, seawater desalination, carbon membrane
