剪切变稀体系同心双轴搅拌釜内的气液分散模拟

发布时间：2018-02-22 20:44

  本文关键词： 剪切变稀体系 气液两相流 同心双轴搅拌釜 气含率 数值模拟　出处：《化工学报》2017年06期 　论文类型：期刊论文

【摘要】：气液搅拌设备因其良好的适用性被广泛应用于过程工业中。为更好地比较不同工况下剪切变稀体系中的气液分散情况,通过实验研究整体气含率和相对功耗确定适宜的转动模式,进而模拟研究表观气速、体系黏度、搅拌转速对气含率和气泡尺寸的影响。结果表明,相同功率下内外双桨反向旋转模式在理想气液分散条件下,相较于单轴内桨和内外双桨同向旋转模式具有更高的气含率和更好的气体泵送能力;表观气速的增加有利于气泡的均匀分散,但气泡尺寸也会随之增大;有效黏度的增加使得搅拌桨的影响区域变小,不利于气泡的均匀分散,气泡尺寸也随之增大;搅拌转速的增加使得循环涡流的影响区域变大,高气含率区不断扩大。
[Abstract]:The gas-liquid mixing equipment is widely used in the process industry because of its good applicability. In order to better compare the gas-liquid dispersion in the shearing thinning system under different working conditions, The proper rotation mode was determined by the experimental study of gas holdup and relative power consumption, and the effects of apparent gas velocity, system viscosity and stirring speed on gas holdup and bubble size were simulated. Under the condition of ideal gas-liquid dispersion, the reverse rotation mode of internal and external propeller has higher gas holdup and better gas pumping capacity than the co-rotating mode of single axis inner propeller and inner and outer double propeller under the condition of ideal gas-liquid dispersion. The increase of apparent gas velocity is conducive to the uniform dispersion of bubbles, but the bubble size will also increase; the increase of effective viscosity makes the influence area of the impeller smaller, which is not conducive to the uniform dispersion of bubbles, and the bubble size will also increase. With the increase of stirring speed, the influence area of swirl and high gas holdup are enlarged.
【作者单位】： 浙江大学化工机械研究所;浙江诚泰化工机械有限公司;
【基金】：浙江省自然科学基金项目(LY16B060003) 浙江省重点科技创新团队项目(2011R50005) 国家自然科学基金项目(21206144)~~
【分类号】：TQ051.72
，

本文编号：1525266