高等学校化学学报

高等学校化学学报 ›› 2012, Vol. 33 ›› Issue (05): 1025.doi: 10.3969/j.issn.0251-0790.2012.05.029

• 物理化学 • 上一篇    下一篇

一种深海中温菌胞外多糖水溶液的流动行为

李海平1, 刘升波2, 侯万国1   

  1. 1. 山东大学国家胶体材料工程技术研究中心, 济南 250100;
    2. 山东大学微生物技术国家重点实验室, 济南 250100
  • 收稿日期:2011-06-30 出版日期:2012-05-10 发布日期:2012-05-10
  • 作者简介:侯万国, 男, 博士, 教授, 主要从事胶体与界面化学研究. E-mail: wghou@sdu.edu.cn
  • 基金资助:

    山东省自然科学基金(批准号: Z2008B08, 2009ZRB01722)资助.

Flow Behavior of Aqueous Solution of Exopolysaccharide Secreted by a Deep-sea Mesophilic Bacterium

LI Hai-Ping1, LIU Sheng-Bo2, HOU Wan-Guo1   

  1. 1. National Engineering and Technology Research Center for Colloidal Materials, Shandong University, Jinan 250100, China;
    2. State Key Laboratory of Microbial Technology, Shandong University, Jinan 250100, China
  • Received:2011-06-30 Online:2012-05-10 Published:2012-05-10

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被引次数

4

摘要： 研究了一种深海中温菌Wangia profunda(SM-A87)胞外多糖(EPS)稀溶液在德国Haake RS75流变仪Z41 DIN同轴圆筒转子系统中的剪切流动行为, 考察了溶液浓度、 温度、 pH值及NaCl浓度对雷诺数(Re)和临界雷诺数(Rec)的影响. 结果表明, 随着溶液浓度的增大, Re逐渐减小而Rec逐渐增大; 随着温度的升高和NaCl浓度的增大, Re逐渐增高而Rec逐渐降低; 在pH=3~12内随着pH值的增加, Re和Rec开始基本保持不变, 当pH>7后Re逐渐增加而Rec逐渐降低. Rec与温度的关系符合Arrhenius-like方程, 与体系黏度间存在幂率关系.

关键词: 雷诺数, SM-A87 胞外多糖, 流变学, 层流, 湍流

Abstract: Shear-induced flow behavior of aqueous solution of exopolysaccharide(EPS) secreted by a deep-sea mesophilic bacterium(SM-A87) was investigated in a coaxial cylindrical measurement system(Z41 DIN) used in the Haake RS 75 Rheometer(Germany), and emphasis was placed on the influence of solution concentration, temperature, pH value and NaCl concentration on Reynolds number(Re) and critical Reynolds number(Rec) of the solution. The results showed that Re decreased but Rec increased gradually with solution concentration inereasing or temperature and NaCl concentration decreasing. As pH value increased from 3 to 12, Re and Rec were initially almost constant, but at pH value higher than 7, Re increased accompanied with Rec decreasing. The relationship between Rec and temperature were fitted well by an Arrhenium-like equation while that between Rec and solution concentration by a power law model.

Key words: Reynolds number, Sea mesophilic bacterium exopolysaccharide(SM-A87 EPS), Rheology, Laminar flow, Turbulent flow

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