摘要
壁面滑移是复杂流体流动中的一种普遍现象.对壁面滑移现象及其机理进行了总结,并讨论了几种检测滑移的方法.壁面滑移产生的机理可分为壁面吸附失效与缠结破裂,其关系十分复杂,且与流体的性质密切相关,还需要深入的研究.检测滑移的方法有标记法、激光—多普勒法、赫磁—共振法等.还阐述了壁面滑移与临界应力、颗粒浓度的关系以及滑移速度的测定和计算方法.壁面滑移影响因素十分复杂,尽管已有一些研究,但是,它们之间的关系远未搞清楚,更缺乏定量的表述.
Wall slip is a commonly recognized phenomenon in flows of complex fluids.This paper presents a review on the existing research of wall slip and methods for its measurement.The mechanism of wall slip is classified into two categories： bonding-debonding,entanglement-disentanglement,both of which depend on the nature of the die material and the polymer melt.As the relationship is very complex,it requires further studies.So methodologies for detection of wall slip are discussed,including straight line marker technique,Laser-Doppler velocimetry,and RHEO-NMR.Relationship between wall slip and its affecting factors such as critical stresses and particle concentrations are described,and the methods for evaluation of slipping velocity are discussed.Wall slip factors are very complex,although there have been some studies,their relationship is far from clear and the of quantitative expression is obvious.
出处
《西安建筑科技大学学报（自然科学版）》
CSCD
北大核心
2011年第2期208-214,共7页
Journal of Xi'an University of Architecture & Technology(Natural Science Edition)
基金
教育厅重点实验室科学研究计划项目(2009-12)
关键词
复杂流体
壁面滑移
临界应力
颗粒浓度
complex fluid
wall ship
critical stress
particle concentration
