顶吹搅拌液相流体的水模实验与数值模拟分析

采用水模型和VOF数学模型对浸没式气体顶吹搅拌液相流体分别进行实验与数值模拟,分析在不同喷吹条件下气泡在液相中的形变、运动及液相流体的流场特性。结果表明,随着气流量和喷管浸入液面深度的增加,气-液混合区域分布范围逐渐扩大,液面波动更剧烈;气流量越大、喷管浸入液面越深、液相温度越高,气泡运动对液相流体内部的搅拌作用越强,流体内部扰动越剧烈,液相流场域中的流场速度越大,其中,当气流量为2.0m3/h、喷管浸入液面深度为340mm时,其液相流场速度最大值达到1.18m/s。

Water model experiment and numerical simulation analysis of top-blown stirring liquid phase fluid

By using the water model and VOF mathematical model, the experimental and numerical simulation of submerged top-blown stirring liquid was carried out separately. The deformation and movement of bubbles in liquid phase and the flow field characteristics of liquid phase were analyzed under different blowing conditions. The results show that with the increase of gas flow rate and immersion depth of the nozzle, the distribution range of gas-liquid mixing zone gradually expands, and the fluctuation of liquid surface becomes more intense. With the increase of gas flow rate, immersion depth of nozzle in liquid surface and liquid temperature, the bubble motion of liquid fluid has a larger internal mixing effect, the fluid internal disturbance becomes more intense, and the flow rate of liquid flow field goes higher. When the gas flow rate is 2.0 m³/h, nozzle immersion depth is 340 mm, the liquid phase flow field has a maximum speed of 1.18 m/s.