首页> 外文期刊>International Journal of Heat and Mass Transfer >Mixing-dynamics of a passive scalar in a three-dimensional microchannel
【24h】

Mixing-dynamics of a passive scalar in a three-dimensional microchannel

机译:三维微通道中无源标量的混合动力学

获取原文
获取原文并翻译 | 示例
           

摘要

The mixing of a diffusive passive-scalar driven by electro-osmotic fluid motion in a micro-channel is studied numerically. Secondary time-dependent periodic or random electric fields, orthogonal to the main stream, are applied to generate cross-sectional mixing. This investigation focuses on the mixing dynamics and its dependence on the frequency (period) of the driving mechanism. For periodic flows, the probability density function (PDF) of the scaled concentration settles into a self-similar curve showing spatially repeating patterns. In contrast, for random flows there is a lack of self-similarity in the PDF for the time interval considered. An exponential decay of the variance of the concentration, and associated moments, is found to exist for both periodic and random velocity fields. The numerical results also indicate that measures of chaoticity (in a deterministic chaotic system) decay exponentially in the frequency - at large frequencies - in agreement with the theory.
机译:数值研究了电渗流在微通道中驱动的扩散无源标量的混合。垂直于主流的次级时间相关的周期性或随机电场被施加以产生横截面混合。这项研究的重点是混合动力及其对驱动机构频率(周期)的依赖性。对于周期性流动,按比例缩放的浓度的概率密度函数(PDF)稳定为显示空间重复模式的自相似曲线。相反,对于随机流,在所考虑的时间间隔内,PDF中缺乏自相似性。发现对于周期速度场和随机速度场都存在浓度变化和相关矩的指数衰减。数值结果还表明,在理论上,混沌(在确定性混沌系统中)的度量在频率(大频率)下呈指数衰减。

著录项

  • 来源
    《International Journal of Heat and Mass Transfer》 |2011年第4期|p.959-966|共8页
  • 作者单位

    School of Mathematical and Statistical Sciences, Arizona State University, Tempe, AZ 85287, USA Environmental Fluid Dynamics Laboratories, Department of Civil, Engineering and Geological Sciences University of Notre Dame, Notre Dame, IN 46556, USA;

    Department of Mechanical Engineering, California State University, Los Angeles, Los Angeles, CA 90032, USA Center for Energy and Sustainability. California State University, Los Angeles, Los Angeles, CA 90032, USA;

    School for Engineering of Matter, Transport and Energy, Arizona State University, Tempe, AZ 85287-6106, USA College of Petroleum Engineering, China University of Petroleum (Beijing), Beijing 102200, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    chaotic mixing; electro-osmotic flow; low reynolds number; random modulation;

    机译:混沌混合;电渗流;低雷诺数;随机调制;

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号