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本文采用 GPC,旋转粘度计和循环管路装置研究了聚甲基丙烯酸癸酯(PDMA)煤油溶液的流变性、减阻性和抗剪切性。实验证明,浓度为0.01%—10%的煤油溶液均是假塑性流体,其流动行为可用τ=K(?)~n 来描述;发现在降温过程中,浓度大于3%的溶液有相分离现象出现,相分离点随浓度增大而升高。PDMA 在煤油中的减阻百分率(DR)随分子量和壁切应力增大而增大。当分子量和壁切应力(τ_w)分别增大到一定值(M_m 和τ_(wm))后,减阻百分率达到最大值(DR_m),以后不再增高。M_m 随浓度增大而减小,但不随τ_w 而变化;DR_m 随τ_w 和浓度增大而增大;在湍流过程中,PDMA 的力学降解过程可用 M=Aexp(-Kt)+M_∞来描述;K 随τ_m 增大而增加,但随浓度增加而减小;M_∞随浓度增大而增大,随τ_w 增大而减小,不随起始分子量 M_o 而变化。
In this paper, the rheology, drag reduction and shear resistance of polymethyl methacrylate (PDMA) kerosene solution were investigated by GPC, rotary viscometer and circulation line. Experiments show that the concentration of 0.01% -10% of the kerosene solution are pseudoplastic fluid flow behavior can be described as τ = K (?) ~ N; found in the cooling process, the concentration of greater than 3% of the phase separation phenomenon Appears, the phase separation point increases with increasing concentration. The percentage drag reduction (PD) of PDMA in kerosene increases with increasing molecular weight and wall shear stress. When the molecular weight and the wall shear stress (τ_w) increase to a certain value (M_m and τ_ (wm) respectively), the drag reduction reaches the maximum value (DR_m) and will not increase afterwards. M_m decreases with increasing concentration, but does not change with τ_w; DR_m increases with increasing τ_w and concentration; during turbulent flow, the mechanical degradation process of PDMA can be described by M = Aexp (-Kt) + M_∞; K increases with increasing τ_m but decreases with increasing concentration. M_∞ increases with increasing concentration, decreases with increasing τ_w, and does not change with initial molecular weight M_o.