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首页> 外文期刊>International Journal of Heat and Mass Transfer >CFD modelling of CaCO_3 crystallization fouling on heat transfer surfaces
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CFD modelling of CaCO_3 crystallization fouling on heat transfer surfaces

机译：传热表面CaCO_3结晶结垢的CFD模拟

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摘要

Supersaturation of inversely soluble salts, like calcium carbonate, causes crystallization fouling on heated surfaces of heat exchangers. In this paper, crystallization fouling of calcium carbonate is studied by CFD modelling. Crystallization fouling is modelled in 2D and 3D flat plate geometries, which correspond to an experimental set-up of an idealised heat exchanger. The model is validated with experimental data under various operating conditions and is used to identify the regions where different parameters have the greatest effect on fouling. The CFD model presented in this paper is a novel combination of a fouling model, which includes the surface integration term and the shear stress dependent residence time, and the hydrodynamics and heat transfer modelled by CFD. The crystallization fouling CFD model predicts the experimental mass deposition rate and the linear fouling resistance within the experimental uncertainty in most of the studied conditions. The crystallization fouling CFD model is very sensitive to the heat exchanger surface temperature, but also relatively sensitive to the shear stress. The validated crystallization fouling model may be utilised to study fouling of industrial heat exchangers when the fouling is controlled by the surface integration. If mass transfer controls the crystallization fouling, the mass transport of ions should be included to the model.
机译：诸如碳酸钙之类的反溶性盐的过饱和会在热交换器的受热表面上造成结晶积垢。本文通过CFD模型研究了碳酸钙的结晶结垢。结晶结垢是在2D和3D平板几何形状中建模的，这与理想化热交换器的实验设置相对应。该模型在各种操作条件下均通过实验数据进行了验证，并用于识别不同参数对结垢影响最大的区域。本文提出的CFD模型是结垢模型的新颖组合，包括表面积分项和与剪切应力有关的停留时间，以及由CFD建模的流体动力学和热传递。在大多数研究条件下，结晶结垢CFD模型可在实验不确定性范围内预测实验质量沉积速率和线性结垢阻力。结晶结垢CFD模型对热交换器表面温度非常敏感，但对剪切应力也相对敏感。当结垢由表面集成控制时，可以使用经过验证的结晶结垢模型来研究工业热交换器的结垢。如果传质控制了结晶结垢，则应将离子的传质包括在模型中。

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  • 作者

    T.M. Paeaekkoenen; U. Ojaniemi; T. Paettikangas; M. Manninen; E. Muurinen; R.L. Keiski; C.J. Simonson;

  • 作者单位

    University of Oulu, Faculty of Technology, Environmental and Chemical Engineering, P.O. Box 4300, FI-90014 University of Oulu, Finland;

    VTT Technical Research Centre of Finland Ltd, Espoo, Finland;

    VTT Technical Research Centre of Finland Ltd, Espoo, Finland;

    VTT Technical Research Centre of Finland Ltd, Espoo, Finland;

    University of Oulu, Faculty of Technology, Environmental and Chemical Engineering, P.O. Box 4300, FI-90014 University of Oulu, Finland;

    University of Oulu, Faculty of Technology, Environmental and Chemical Engineering, P.O. Box 4300, FI-90014 University of Oulu, Finland;

    University of Saskatchewan, Department of Mechanical Engineering, Saskatoon, SK S7N 5A9, Canada,University of Oulu, Faculty of Technology, Environmental and Chemical Engineering, P.O. Box 4300, FI-90014 University of Oulu, Finland;

  • 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

    Crystallization; Fouling; CFD; Heat transfer; Calcium carbonate;

    机译：结晶;结垢;差价合约传播热量;碳酸钙;

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