摘要
目的研究水处理构筑物内的流动以及絮体在池内的运动,为气浮的优化设计提供参考依据.方法以等圆直径作为带气絮体的特征粒径,通过图像法来计算带气絮体的密度,得出带气絮体直径-密度的函数关系.以上述得到的结果作为Fluent中DPM(DiscrectPhaseMod-el)模型的粒子粒径-密度设定的依据,对两相流进行计算.结果在模型分离区中对不同位置的带气絮体运动速度进行观测,其速度一般在10～20mm/s.以图像法得到分离区中带气絮体的直径-密度函数关系来表示絮体颗粒物理特性,当进水量Q为20m3/h,回流比R为9%,投加15mg/L三氯化铁时,带气絮体粒径-有效密度的数学表达式为ρ0-ρ=0.0002D-1.6845.结论以图像法得到分离区中带气絮体的直径-密度函数关系来表示絮体颗粒物理特性,结合Flu-ent的DPM(离散相)模型来模拟带气絮体在气浮分离区的运动是可行的.
The paper aims to study the motion of flocs in the flotation separation zone based on numerical simulation for the purpose of flotation optimization. The equal circle diameter was treated as characteristic size of flocs, the density of flocs was calculated by means of image technique, the result of measurement was the basis of the density-size function and the input of the parameters of DPM（ Discrete Phase Model）. As the inflow was 20 m3/h,flotation reflux ration was 9% ,the floc does of FeCl3 was 15 mg/L, the function of diameter-density was ρ0-ρ=0.0002D-1.6845. The buoyancy velocity of flocs in separation zone was known in the range of 10-20 mm/s by measurement. It is concluded according to the relationship of density-size of flocs described by means of image technique, the DPM can describe the motion of flocs in the flotation sepa- ration zone by comparison with the result of measurement.
出处
《沈阳建筑大学学报（自然科学版）》
CAS
北大核心
2010年第2期339-344,364,共7页
Journal of Shenyang Jianzhu University：Natural Science
基金
国家自然科学基金项目(607833)
