基于正交试验的磨料浆体流变特性

Rheological properties research of abrasive suspension based on orthogonal experiment

立足于磨料浆体射流在除鳞领域的应用,通过设计正交试验,对磨料浆体的流变参数进行测量,研究不同因素对2种磨料浆体流变特性的影响效应。结果表明:对于石榴石磨料浆体,聚丙烯酰胺(PAM)质量浓度对磨料浆体黏度的影响最为显著,磨料质量浓度次之,磨料粒径对磨料浆体黏度无明显影响。对于钢砂磨料浆体,PAM质量浓度对磨料浆体黏度有显著影响,磨料质量浓度和磨料粒径对磨料浆体黏度无明显影响。利用幂律模型、Bingham模型及Herschel-Bulkley模型对实验测得的流变参数进行拟合,优选出Herschel-Bulkley模型作为描述磨料浆体流变特性的最佳模型,建立了其本构方程,得出磨料浆体的流变特性规律。

The effects of different factors on the rheological properties of abrasive suspension were experimentally conducted by measuring the rheological parameter of abrasive suspension, which polyacrylamide （PAM）, garnet and steel grit were selected as additive and abrasive respectively in the field of descaling of abrasive suspension jet. The results show that, abrasive concentration and abrasive grit have little influence on the viscosity of suspension. The garnet and steel grit, abrasive slurry viscosity change curves have almost the same rule which the viscosity decreases with the sheafing rate increasing. The measured data were fitted using power-law model, Bingham model and Herschel-Bulkley model. It is found that Herschel-Bulkley model is more accurate to describe rheological properties of two kinds of abrasive slurry. Based on Herschel-Bulkley model, the constitutive equations are established and rheological law is obtained.