圆管中中性悬浮液流动阻力和流变性的实验测定.pdfVIP

Vo 1. 59 No.11 化工学报 第 59 卷第11 期 2008 年 11 月 Journal of Chemical Industry and Engineering (Chína) November 2008 圆管中中性悬浮液流动阻力和 臣五百 流变性的实验测定 黄笑林1.2 ，张敬升飞扬 超2 ，禹耕之2 ，韩宜玲2 ，王永刚1 (1 中国矿业大学(北京)化学与环槐工程学院，北京 100083; Z 中国科学院过程工程研究所，北京 100190) 摘要z 对商浓度的液阎悬浮液在阴管中的流变特性进行了实验研究，实验体系为聚苯乙烯颗粒在 NaCl 水溶液中 的中性悬浮液。测定了在息流状态下，固体颗粒的体职分数变化 (20% -50%) 、悬浮液流速变化 (0.031- 0.22 m. S-I) 以及颗粒粒度变化对悬浮液压降的影响规律.实验结果表明，团体颗粒的浓度会影响悬浮液的流 变性质，颗粒粒径对悬浮液流变性影响微弱。悬浮液的压降随颗粒体识分数和流速的增大而增大，悬浮液的流 动特性在较高颗粮浓度范围内符合幕率流体模型。 关键词:中性悬浮液z 流变性z 圆管流动 中图分S障碍:丁Q 03 文献栋i只码 :A 文章编号: 0438 … 1157 (2008) 11-2787-07 Determination of resistance and rheological properties of neutrally buoyant suspensions in tube nOW HUANG Xiaolin %. ZHANG Jingshen矿 I YANG Chaol • YU Gengzhi1 • HAN Baolin矿， WANG Yonggang 1 e Sc缸)()lo/ 白.emical and Envi rcmme:nta l Engineering ， ωina University 0/ Mining . Technology , Beijing 100083 , China; 2Instítute 0/ Process Engineering , Chinese Academy 0/ Sciences , Beijing 100190 , China) Abstract: 丁he rheological properties of moderately concentrated suspensions were studied experimentally. This work was focused on the systems consisting of rigid , neutrally buoyant 叩heres suspended in a Newtonian fluid undergoing laminar tube flow. The írictional pressure drop was measured as a function of non-Newtonian power-law constants. The particle holdups of the suspensions were from 20% to 50 %. and the flow rates ranged írom 0.031 m • S-1 to 0.