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Numerical simulation of corrosion product deposition on heat exchanger surfaces.

机译:热交换器表面腐蚀产物沉积的数值模拟。

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摘要

To improve our understanding of heat exchanger fouling, the deposition of colloidal magnetite particles (Fe3O4) was experimentally studied under various conditions of heat transfer.;In the present work, fouling is described and a general model is used to simulate fouling under non-boiling heat transfer conditions and to compare the results to experimental values. A commercial fluid-dynamic software package called Fluent, utilizing k-epsilon turbulence models, was used to compute the thermalhydraulic properties of the fluid inside the column.;It was assumed that convection and diffusion ruled the transport of magnetite since the particles considered are of micrometre size. The deposition was simulated using an Eulerian model based on the convection-diffusion equation, including turbulent and Brownian diffusion. A Lagrangian model, based on the resolution of the equation of momentum for a particle, was also used to characterize better the relative importance of thermophoresis, lift and Brownian motion on the transport of particles. (Abstract shortened by UMI.).
机译:为了增进我们对换热器结垢的理解,在各种传热条件下对胶体磁铁矿颗粒(Fe3O4)的沉积进行了实验研究;在本工作中,描述了结垢并使用通用模型来模拟非沸腾情况下的结垢。并将传热条件与实验值进行比较。商用流体动力学软件包Fluent利用k-ε湍流模型计算了塔内流体的热工水力特性;假定对流和扩散控制着磁铁矿的传输,因为所考虑的颗粒是微米大小。使用基于对流扩散方程的欧拉模型(包括湍流和布朗扩散)模拟沉积。基于粒子动量方程的分辨率的拉格朗日模型也用于更好地表征热泳,提升和布朗运动对粒子传输的相对重要性。 (摘要由UMI缩短。)。

著录项

  • 作者

    Callamand, Stephane Pierre.;

  • 作者单位

    University of New Brunswick (Canada).;

  • 授予单位 University of New Brunswick (Canada).;
  • 学科 Engineering Mechanical.
  • 学位 M.Sc.
  • 年度 1999
  • 页码 111 p.
  • 总页数 111
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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