Department of Chemical Engineering, National Institute of Technology, Jalandhar, India.
Bioprocess Biosyst Eng. 2013 Aug;36(8):1011-8. doi: 10.1007/s00449-012-0853-7. Epub 2012 Nov 9.
Axial dispersion is an important parameter in the performance of packed bed reactors. A lot of fluids exhibit non-Newtonian behaviour but the effect of rheological parameters on axial dispersion is not available in literature. The effect of rheology on axial dispersion has been analysed for viscoinelastic and viscoelastic non-Newtonian fluids. Aqueous solutions of carboxymethyl cellulose and polyacrylamide have been chosen to represent viscoinelastic and viscoelastic liquid-phases. Axial dispersion has been measured in terms of BoL number. The single parameter axial dispersion model has been applied to analyse RTD response curve. The BoL numbers were observed to increase with increase in liquid flow rate and consistency index 'K' for viscoinelastic as well as viscoelastic fluids. Bodenstein correlation for Newtonian fluids proposed has been modified to account for the effect of fluid rheology. Further, Weissenberg number is introduced to quantify the effect of viscoelasticity.
轴向分散是填充床反应器性能的一个重要参数。许多流体表现出非牛顿行为，但流变学参数对轴向分散的影响在文献中尚不可用。本文分析了流变学对轴向分散的影响，分别针对黏弹性和黏弹性非牛顿流体。选择羧甲基纤维素和聚丙烯酰胺的水溶液来代表黏弹性和黏弹性液相。轴向分散用 BoL 数表示。单参数轴向分散模型已应用于分析 RTD 响应曲线。观察到 BoL 数随液体流速和黏弹性以及黏弹性流体的稠度指数“K”的增加而增加。已对牛顿流体的 Bodenstein 相关系数进行了修改，以考虑流体流变学的影响。此外，引入了 Weissenberg 数来量化黏弹性的影响。
