摘要
本文研究了聚甲基丙烯酸已酯(PHMA)在煤油和煤油-丙酮混合溶剂中的减阻性能和抗剪切性能及分子量 M、水力学体积[η]M 等分子参数的影响。采用电子计算机进行回归分析,提出了减阻百分率 DR 与 PHMA 的分子量之间的数学关系式:DR=A·M/(M+B)-D;减阻百分率 DR 随湍流剪切作用时间 t 的变化可用下式描述:DR=DR_L+ae^(-bt)。发现达到最大减阻百分率DR_m 时的极限浓度 C_m 随分子量增大而减小;DR 值随 PHMA 分子无规线团的旋转半径 R_g 的增大而线性增大;聚合物的极限减阻率 DR_L 随分子量和水力学体积[η]M 增大而增大。
Drag reduction effectiveness and resistance to degradation in relation fo molecular weight and hydrodynamic volume of poly(hexyl methacrylate)in kerosene solution and ketone /kerosene mixed solvent were studied.It is found that drag reduction (DR)in these solutions bear a relation to molecular weight of reducer:DR=AM/(M+B)-D,and that the relation- ship between DR and flow time (t) in turbulent flow can be described by following form- ulation:DR=DR_L+ae^(-bt).The drag reduction effectiveness increases with increase of mole- cular weight of reducer to a certain extent.There is a threshold value of molecular weight above which DR will increase no longer.The molecular weight for the maximum drag reduction achievable decreases with increase of concentration.DR is directly proportional to the effective diameter of random coil of polymeric molecules.The threshold value of DR in degradation is increased with the molecular weight of reducer and concentration of solu- tions.
出处
《油田化学》
CAS
CSCD
北大核心
1989年第1期58-64,共7页
Oilfield Chemistry
基金
中国国家自然科学基金课题
