Dewatering saturated, networked suspensions with a screw press
Dewatering saturated, networked suspensions with a screw press
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使用螺旋压榨机对饱和的网状悬浮液进行脱水
DOI：
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发表时间：
2019
影响因子：
1.3
通讯作者：
D. Martinez
中科院分区：
文献类型：
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作者：
T. Eaves;D. Paterson;D. Hewitt;N. Balmforth;D. Martinez;Mark;D. Martinez
本文提出了一种在螺旋压榨机中进行饱和两相介质脱水的数学模型。该模型占详细的两相流变行为的压制材料和分裂的压力分为两个区域，一个初始的混合均匀的恒压区域，然后由一个轴向运输区域中的总压力稳步增加。在后一个区域中，引入了缓慢变化的螺旋坐标变换，以帮助将动态减少到两相介质的环形双轴压缩。与先前的建模不同，两个区域之间的过渡点是自洽地确定的，而不是先验地设置的，并且沿着压力机的长度的压力是从两相流的流变学推导的，而不是对压力机的横截面上的两相动力学进行平均。该模型进行了比较，造纸纤维悬浮液和粘土浆料的脱水实验观察，并显示再现操作数据。
A model is presented for the dewatering of a saturated two-phase medium in a screw press. The model accounts for the detailed two-phase rheological behaviour of the pressed material and splits the press into two zones, an initial well-mixed constant-pressure region followed by an axial transport region in which the total pressure steadily increases. In this latter region, a slowly varying helical coordinate transformation is introduced to help reduce the dynamics to an annular bi-axial compression of the two-phase medium. Unlike previous modelling, the transition point between the two zones is determined self-consistently, rather than set a priori, and the pressure along the length of the press is deduced from the rheology of the two-phase flow rather than averaging the two-phase dynamics over a cross section of the press. The model is compared to experimental observations of the dewatering of a paper-making fibre suspension and of a clay slurry, and is shown to reproduce operational data.