發(fā)布時(shí)間：2019-03-12 14:09

【摘要】：通過(guò)分析絮團(tuán)在沉降過(guò)程中所受不同性質(zhì)的力與絮團(tuán)形狀參數(shù)之間的關(guān)系,提出了一套新的絮團(tuán)粒徑定義方法.以兩種不同性質(zhì)的泥沙為對(duì)象,使用新定義與傳統(tǒng)的等效圓定義分別計(jì)算了泥沙絮團(tuán)二維圖像的粒徑,并對(duì)比了兩種結(jié)果的優(yōu)劣.研究結(jié)果表明:與傳統(tǒng)定義相比,新定義的計(jì)算結(jié)果更加符合實(shí)測(cè)沉速的分布規(guī)律,計(jì)算精度也有較大幅度提升;當(dāng)計(jì)算形狀不規(guī)則絮團(tuán)的沉速時(shí),提升幅度要明顯大于平均提升幅度;與傳統(tǒng)定義相同,當(dāng)使用新定義計(jì)算絮團(tuán)沉速時(shí),小顆粒絮團(tuán)的計(jì)算結(jié)果要優(yōu)于大顆粒絮團(tuán).
[Abstract]:Based on the analysis of the relationship between the force of different properties and the shape parameters of the floc during the settling process, a new method for defining the particle size of the floc was put forward. Taking two kinds of sediment with different properties as the object, the two-dimensional images of sediment flocs are calculated by using the new definition and the traditional equivalent circle definition, and the advantages and disadvantages of the two results are compared. The results show that, compared with the traditional definition, the calculation results of the new definition are more consistent with the distribution law of the measured sedimentation velocity, and the calculation accuracy is also greatly improved. When the settling velocity of irregular shaped floc is calculated, the lifting amplitude is obviously larger than the average lifting amplitude, and when the new definition is used to calculate the settling velocity of floc, the calculation result of small particle flocculation is better than that of large one.
【作者單位】： 武漢大學(xué)水利水電學(xué)院;
【分類號(hào)】：TV142

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