Transport Processes in Two-Phase Systems; An Effective Continuum Theory

两相系统中的传输过程;

基本信息

  • 批准号:
    8803048
  • 负责人:
  • 金额:
    --
  • 依托单位:
  • 依托单位国家:
    美国
  • 项目类别:
    Standard Grant
  • 财政年份:
    1988
  • 资助国家:
    美国
  • 起止时间:
    1988-03-01 至 1990-02-28
  • 项目状态:
    已结题

项目摘要

The objectives of this research program are: 1) To apply the effective continuum method recently developed by the PI to a host of mass and heat transport processes involving two-phase media, and, thereby, obtain theoretical expressions for the relevant effective parameters; 2) To place this method, which is presently only ad hoc, on a firmer theoretical foundation; 3) To develop a theory for determining the pair probability function in flowing systems and thereby compute the dependence of these effective parameters on the strength and structure of the impressed flow; and 4) To derive theoretical expressions for the shear induced particle diffusion coefficient in flowing suspensions and for the enhancement of the mass transfer rate in flowing liquids by the addition of inert solid particles. These two effects, which play an important role in a wide variety of physical and biological operations, can at present be modeled only qualitatively. Effective parameters are currently computed either via variational techniques (which are generally inaccurate), exact calculations (which are either very time consuming or very specialized), or approximate ad hoc models containing adjustable factors which are often unreliable. In contrast, the effective continuum method developed by the PI is relatively simple and straightforward, is of great generality and versatility, and, has been successfully tested against experimental results. This method also extends the applicability of the continuum representation to systems where the micro and macro length scales are of comparable magnitude.
本研究计划的目标是:1)将PI最近发展的有效连续体方法应用于涉及两相介质的大量质量和热量传递过程,从而获得相关有效参数的理论表达式;(2)使这种目前只是临时的方法有更坚实的理论基础;3)建立一种确定流动系统中对概率函数的理论,从而计算这些有效参数对受压流强度和结构的依赖性;4)推导了流动悬浮液中剪切诱导颗粒扩散系数的理论表达式,以及加入惰性固体颗粒提高流动液体传质速率的理论表达式。这两种效应在各种各样的物理和生物操作中起着重要作用,目前只能定性地模拟。目前,有效参数的计算要么通过变分技术(通常不准确),要么通过精确计算(要么非常耗时或非常专业),要么通过包含可调因素的近似特设模型(通常不可靠)。相比之下,PI开发的有效连续体方法相对简单直接,具有很强的通用性和通用性,并且已经成功地通过实验结果进行了验证。该方法还将连续体表示的适用性扩展到微观和宏观长度尺度具有可比量级的系统。

项目成果

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Andreas Acrivos其他文献

On the effective moduli of composite materials: Experimental study of chopped-fiber reinforcement
The extended Graetz problem at low Peclet numbers
  • DOI:
    10.1007/bf00420068
  • 发表时间:
    1980-01-01
  • 期刊:
  • 影响因子:
    2.400
  • 作者:
    Andreas Acrivos
  • 通讯作者:
    Andreas Acrivos
On the effective moduli of composite materials: Slender rigid inclusions at dilute concentrations
Rimming flows within a rotating horizontal cylinder: asymptotic analysis of the thin-film lubrication equations and stability of their solutions
旋转水平圆柱内的边缘流动:薄膜润滑方程的渐近分析及其解的稳定性
  • DOI:
    10.1007/s10665-004-1772-7
  • 发表时间:
    2004-11-01
  • 期刊:
  • 影响因子:
    1.400
  • 作者:
    Andreas Acrivos;Bo Jin
  • 通讯作者:
    Bo Jin

Andreas Acrivos的其他文献

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{{ truncateString('Andreas Acrivos', 18)}}的其他基金

Support of IUTAM Symposium "Recent Advances in Multiphase Flows: Numerical & Experimental"
支持 IUTAM 研讨会“多相流的最新进展:数值
  • 批准号:
    0613149
  • 财政年份:
    2006
  • 资助金额:
    --
  • 项目类别:
    Standard Grant
Transport and Segregation of Suspensions in Traveling Electric Fields
行进电场中悬浮液的传输和分离
  • 批准号:
    0307099
  • 财政年份:
    2003
  • 资助金额:
    --
  • 项目类别:
    Continuing Grant
Transport Processes in Two-Phase Macroscopically Homogeneous Systems
两相宏观均匀系统中的传输过程
  • 批准号:
    9711442
  • 财政年份:
    1997
  • 资助金额:
    --
  • 项目类别:
    Standard Grant
Transport Processes in Two-Phase Macroscopically Homogeneous Systems
两相宏观均匀系统中的传输过程
  • 批准号:
    9318820
  • 财政年份:
    1994
  • 资助金额:
    --
  • 项目类别:
    Continuing grant
U.S.-Austria Cooperative Research on the Hydrodynamic Stability of a Resuspended Layer
美国-奥地利关于重悬浮层水动力稳定性的合作研究
  • 批准号:
    9012193
  • 财政年份:
    1991
  • 资助金额:
    --
  • 项目类别:
    Standard Grant
Engineering Research Equipment Grant: Rheometric Fluid Spectrometer
工程研究设备资助:流变流体光谱仪
  • 批准号:
    9007675
  • 财政年份:
    1990
  • 资助金额:
    --
  • 项目类别:
    Standard Grant
Sedimentation in Settling Tanks Having Inclined Walls -- TheBoycott Effect
倾斜壁沉淀池中的沉淀——抵制效应
  • 批准号:
    9012546
  • 财政年份:
    1990
  • 资助金额:
    --
  • 项目类别:
    Continuing Grant
Transport Processes in Two-Phase Macroscopically HomogeneousSystems
两相宏观均匀系统中的传输过程
  • 批准号:
    9012937
  • 财政年份:
    1990
  • 资助金额:
    --
  • 项目类别:
    Continuing grant
Sedimentation in Settling Tanks Having Inclined Walls - The Boycott Effect
具有倾斜壁的沉淀池中的沉淀 - 抵制效应
  • 批准号:
    8896170
  • 财政年份:
    1988
  • 资助金额:
    --
  • 项目类别:
    Continuing grant
Sedimentation in Settling Tanks Having Inclined Walls - The Boycott Effect
具有倾斜壁的沉淀池中的沉淀 - 抵制效应
  • 批准号:
    8604067
  • 财政年份:
    1986
  • 资助金额:
    --
  • 项目类别:
    Continuing Grant

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