摘要
通过均匀粒子充填床层流动试验求得了多种聚合物稀溶液在稳定层流条件下由纯粘性流动转变为粘弹性流动的临界条件:临界流速,临界雷诺数、临界德博拉数、综合阻力系数>1。讨论了聚合物链结构、分子量、溶液浓度、床层孔隙结构等对粘弹效应的影响。粘弹性流体流经均匀粒子充填床层时的总压力降由粘性压力降和弹性压力降组成:ΔP_T=ΔP_C+ΔP_E,作者利用修正的 Blake-Kozeny 方程得到了ΔP_V 的表达式,基于实验结果求出了ΔP_E 的表达式:ΔP_E=C_0ηpθ_(fl)V_0~m/Dp^2,其中 C_0和 m 为流体参数。
The flow behavior of dilute solutions of various polymer samples (PAMs of different HD,xanthan,POE) in packed beds filled with uniform pellets is studied.The critical conditions of transition from pure viscous to viscoelastic patern in steady laminar flow are determined and charaeterizised by critical flow rate,Reynolds and Deborah numbers, and complex friction coefficient deviation from unit.The influence of chain structure and molecular weight of polymers,solution concentration,and bed structure upon the vis- coelastic effect is also discussed.It is suggested that the total pressure drop,△P_T,for a viscoelastic fluid being flown through packed beds filled with uniform pellets can be di- vided into viscous,△P_V,and elastic,△P_E,components.The former can be expressed in terms of the modified Blake-Kozeny equation for power-law fluids.An empirical equation for the later component is deduced on the basis of experimental results as△P_E=C_0η_pθ_(?)V_0~m/ D_P^2 where C_0 and m-parameters of the fluid,η_P-polymer concentration,θ_(?)-relaxation time of the fluid,V_0-flow rate,and D_P-particte size in the bed.
出处
《油田化学》
CAS
CSCD
北大核心
1992年第2期145-150,共6页
Oilfield Chemistry
关键词
聚合物稀溶液
孔隙介质流动
Polymers
Dilute Polymer Solutions
Flow through Porous Media
Viscoelastic Effect
