Steric-Effect Induced Alterations in Streaming Potential and Energy Transfer Efficiency of Non-Newtonian Fluids in Narrow Confinements
Steric-Effect Induced Alterations in Streaming Potential and Energy Transfer Efficiency of Non-Newtonian Fluids in Narrow Confinements
复制标题
DOI：
10.1021/la202273e
复制
发表时间：
2011-10-04
期刊：
影响因子：
3.9
通讯作者：
Chakraborty, Suman
中科院分区：
文献类型：
--
作者：
Bandopadhyay, Aditya;Chakraborty, Suman
在这项工作中，我们探索的可能性，利用界面电动力学和流变学的综合后果，增加在狭窄的流体约束的能量传递效率。特别地，我们考虑利用空间效应（即，离子种类的有限尺寸的影响）在非牛顿流体在小尺度上，以报告显着增加的流动潜力，剪切增稠流体。我们首先推导出一个表达式考虑强双电层相互作用的封闭的流道中的流动电位和斯特恩层的有限电导的后果，超越德拜-休克尔极限。通过详细考虑离子种类的排斥体积效应及其与特殊类型流变流体（如上述形式体系中的幂律流体）的相关界面现象的相互作用，我们证明了空间相互作用与非牛顿输运特性的汇合可能导致剪切增稠流体在适当条件下能量传递效率的巨大增加。
In this work, we explore the possibilities of utilizing the combined consequences of interfacial electrokinetics and rheology toward augmenting the energy transfer efficiencies in narrow fluidic confinements. In particular, we consider the exploitation of steric effects (i.e., effect of finite size of the ionic species) in non-Newtonian fluids over small scales, to report dramatic augmentations in the streaming potential, for shear-thickening fluids. We first derive an expression for the streaming potential considering strong electrical double layer interactions in the confined flow passage and the consequences of the finite conductance of the Stern layer, going beyond the Debye-Huckel limit. With a detailed accounting for the excluded volume effects of the ionic species and their interaction with pertinent interfacial phenomena of special type of rheological fluids such as the power law fluids in the above-mentioned formalism, we demonstrate that a confluence of the steric interactions with the non-Newtonian transport characteristics may result in giant augmentations in the energy transfer efficiency for shear-thickening fluids under appropriate conditions.