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首页> 外文会议>12th annual conference of the CFD Society of Canada (CFD 2004) >Bubble Dynamics in Non-Newtonian Fluids:A Numerical Analysis
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Bubble Dynamics in Non-Newtonian Fluids:A Numerical Analysis

机译：非牛顿流体中的气泡动力学：数值分析

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摘要

The effect of adding small amounts of certain high- molecular weight polymers to Newtonian solvents such as water is investigated numerically.To achieve this goal,a single spherical gas bubble placed in an acoustic pressure field was considered for the analysis.It was assumed that upon dissolving polymeric additives,the surrounding liquid obeys the''second-grade''model as its constitutive equation.The governing equation was then solved numerically using Runge-Kutta method and it was found that bubble dynamics can be affected by polymeric additives as a result of an alteration in its physical(surface tension),and/or rheological properties (viscosity,relaxation time).Among these,fluid’s elas- ticity appears to have the most influential stabilizing effect.The amplitude of the pressure field was also shown to be important in the response of the bubble but its frequency of little or no consequence.
机译：数值研究了向牛顿溶剂（如水）中添加少量某些高分子量聚合物的效果。为实现此目标，考虑了放置在声压场中的单个球形气泡进行分析。溶解聚合物添加剂后，周围的液体服从“二级”模型的本构方程。然后用Runge-Kutta方法对控制方程进行数值求解，发现泡沫动力学可以受到聚合物添加剂的影响。它的物理（表面张力）和/或流变特性（粘度，松弛时间）的变化。其中，流体的弹性似乎具有最大的稳定作用。压力场的振幅也显示为对泡沫的响应很重要，但是其发生频率很小甚至没有后果。

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  • 来源
  • 会议地点 Ottawa(CA);Ottawa(CA)
  • 作者

    A.Najafi; K.Sadeghy;

  • 作者单位

    University of Tehran,Faculty of Engineering,Department of Mechanical Engineering,Tehran,IRAN,P.O.Box:11365-4563;

    University of Tehran,Faculty of Engineering,Department of Mechanical Engineering,Tehran,IRAN,P.O.Box:11365-4563,Email:sadeghy@chamran.ut.ac.ir;

  • 会议组织
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 工程流体力学;
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