水力旋流器内固液两相间的相对运动(Ⅲ)——湍流频率与固液跟随特性
来源期刊：中国有色金属学报1999年第1期
论文作者：徐继润 罗茜
文章页码：133 - 138
关键词：水力旋流器，颗粒运动，湍流频率，跟随特性
Key words：hydrocyclones, particle motion, turbulence frequency, follow-up situation
摘 要：考察了湍流频率对水力旋流器内固液两相间相对运动的影响。 研究表明， 颗粒与流体在切向与轴向的跟随性与湍流频率的关系比较简单， 即随湍流频率的增加两相间的跟随性下降， 但在旋流器的半径方向， 由于湍流脉动与离心沉降的联合作用， 颗粒与流体的跟随呈复杂的变化。 视颗粒粒度的不同， 径向跟随性指标ηr(表征颗粒速度与流体速度之比)与湍流频率ω的关系有三种基本形式： 对小颗粒， ηr随ω的增加出现极大值， 但ηr始终为正(颗粒与流体的运动同向)； 对中等粒度的颗粒， 随ω的增大， ηr由负而正， 并在正负区各出现一次极值； 对大颗粒，ηr虽也存在由负而正的变化， 但极大值只出现在正值区。 文中对这些现象给出了合理的解释。
Abstract: The effect of fluid turbulence frequency on the relative motion between solid particles and liquid medium in hydrocyclones was examined with follow-up parameter η and turbulence frequency ω. It is shown that the parameters in tangential and vertical directions have simpler relation with turbulence frequency, i.e. the relative motion, as expected, gets more obvious with the increase of turbulence frequency; but in radial direction the lags between particles and fluid behave much more complicated than in other two directions due to the existence of centrifugal force. Three basic behavior forms are found for particles with different diameters and the mechanism are explained.
