One-Dimensional Drift-Flux Model of Gas Holdup in Fine-Bubble Jet Reactor
One-Dimensional Drift-Flux Model of Gas Holdup in Fine-Bubble Jet Reactor
复制标题
细泡喷射反应器含气率一维漂移通量模型
DOI：
10.1016/j.cej.2019.03.098
复制
发表时间：
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影响因子：
15.1
通讯作者：
Zhibing Zhang
中科院分区：
文献类型：
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作者：
Hongzhou Tian;Shaofeng Pi;Yaocheng Feng;Zheng Zhou;Feng Zhang;Zhibing Zhang
建立了微泡射流反应器(简称FJR)内气含率的一维漂移通量模型，并进行了实验验证。该模型由三个关键子模型(气泡Sauter平均直径、气泡平均上升速度和能量耗散率)组成。从理论上讨论了降液管长度、液体动力粘度和表面张力对气泡平均直径、能量耗散率和气含率的影响。选择了三种不同的体系(空气-自来水、空气-水乙醇和空气-水甘油)在不同的液体流量、喷嘴直径、降液管长度和温度等条件下对模型进行了验证。理论结果表明，FJR降液管中的能量耗散率是影响FJR塔内气含率的关键因素。模型预测的气含率与实验结果基本一致，误差在±15%以内。
A one-dimensional drift flux model of the gas holdup in the fine-bubble jet reactor (for short FJR) was developed and experimentally verified. The model consists of three key sub-models (bubble Sauter mean diameter, bubble average rising velocity and energy dissipation rate). Effects of downcomer length, liquid dynamic viscosity and surface tension on the bubble Sauter mean diameter, energy dissipation rate, and gas holdup were discussed theoretically. Furthermore, three kinds of systems (air-tap water, air-aqueous ethanol, and air-aqueous glycerol) were chosen to validate the model under different conditions including liquid flow rate, nozzle diameter, downcomer length, and temperature. Theoretical results indicated that the energy dissipation rate in the downcomer of FJR was the critical factor influencing gas holdup in the column of FJR. It is also found that gas holdups predicted by the model were roughly identical to experimental results and errors were within ±15%.