膜科学与技术

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Numerical simulation and Experiment for flow field characteristics in reactor after aeration based on VOF

Authors： WANG Hai-bo1, LI Chun-li2, QIU Guang-ming2, GUO Xiao2

Units： 1. Civil Engineering institute, Inner Mongolia University of Technology, 2.College of Energy and Power Engineering, Inner Mongolia University of Technology, Hohhot 010051

KeyWords： reactor; aeration intensity; VOF method; characteristics of flow field; numerical modeling; experimental verification

ClassificationCode：TB324；TB332

year,volume(issue):pagination： 2016,36(3):70-78

Abstract：

In this paper, the influence law of the characteristics of flow field in the reactor under different aeration intensities at the aeration strength of 1mm was simulated by the method of VOF, the bubble behavior was described, the distribution features of turbulence intensity and velocity field of the flow field in the reactor under different working conditions were analyzed, the variation of velocity and turbulence intensity of the single liquid region on the height direction of the central axis of the aeration hole was concluded, and finally, the simulation was verified according to the experiments. The results show that the bubble changes into similar tadpole when it breaks away the aeration hole and the tail disappears after a certain period of time and then begins to upward sag, the slug flow begins to appear between the both sides of the aeration holes at the working conditions of 96L/h and 140L/h; a more intense turbulent disturbance appears from the wake region of initial bubble and the vortex ring of velocity of similar airplane wing forms; the laryngeal changing with the turbulence intensity of the single liquid region on the height direction at 20mm of the central axis of the aeration hole appears; the velocity of the single liquid region rises linearly on the height direction of the central axis of the aeration hole at the working condition of 24L/h; it rises which follows the multi-stage similar linear law at the working conditions of 96L/h and 140L/h. Therefore, the simulation results are proved to be reliable according to the experiments. In this study, the operating parameters of the process of the membrane fouling on the aeration control can be optimized, which can guide the design process of the devices of the membrane fouling on the aeration control during the engineering practice to some extent.

Funds：

国家自然科学基金项目（51263013）；内蒙古自然科学基金（2011MS0802）

AuthorIntro：

作者简介：王海博（1987-），女，陕西西安，主要研究方向：膜分离和水处理技术，E-mail：327947362@qq.com 通讯联系人：邱广明（1962-），男，教授，主要研究方向：高分子分离膜与水处理技术

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