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Crystallization Fouling With Enhanced Heat Transfer Surfaces

机译：强化传热表面的结晶结垢

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摘要

The aim of this paper is to demonstrate that a simple stirred batch cell can be used to study the effects of surface shear stress (among other process parameters) on fouling from saturated calcium salt solutions. For otherwise identical operating conditions, the overall fouling rate on a smooth mild steel surface was found to be reduced either when fine wires were attached to it or when helical threads were incorporated into the surface, either in the form of a continuous helical groove or in the form of a raised helix. The raised helical surface was more effective in reducing fouling than the helical groove. The results confirm the general effect that fouling rates can be reduced by increasing the surface shear stress through surface enhancement. A simple mathematical model has been developed to take into account the dynamic change in bulk concentration as crystallization fouling occurs. In all cases, the overall fouling resistance increased asymptotically toward a constant value and could easily and accurately be described quantitatively by the new analytical model. The variations of shear stresses on the various surfaces were determined from computational fluid dynamics simulations using the commercial package Comsol 4.2.
机译：本文的目的是证明可以使用简单的搅拌式间歇式槽来研究表面剪切应力（以及其他工艺参数）对饱和钙盐溶液结垢的影响。对于其他相同的工作条件，发现光滑的低碳钢表面上的总结垢率降低了，或者是将细线连接到表面上，或者当螺旋线以连续螺旋槽的形式或在表面上并入螺旋线时降低了。凸起螺旋的形式。凸起的螺旋表面比螺旋凹槽更有效地减少了结垢。结果证实了一般效果，即通过表面增强增加表面剪切应力可以降低结垢率。已经开发出一种简单的数学模型，以考虑到发生结垢时体积浓度的动态变化。在所有情况下，总的耐污垢性都渐近地向恒定值增加，并且可以通过新的分析模型轻松，准确地进行定量描述。使用商业软件包Comsol 4.2，通过计算流体动力学模拟确定了各种表面上的剪应力变化。

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  • 来源
    《Heat Transfer Engineering》 |2015年第8期|741-749|共9页
  • 作者

    BARRY D. CRITTENDEN; MENGYAN YANG; LEILEI DONG; ROB HANSON; JACK JONES; KRISH KUNDU; JONATHAN HARRIS; OLEKSANDR KLOCHOK; OLGA ARSENYEVA; PETRO KAPUSTENKO;

  • 作者单位

    Department of Chemical Engineering, University of Bath, Bath, BA2 7AY, United Kingdom;

    Department of Chemical Engineering, University of Bath, Bath, United Kingdom;

    Department of Chemical Engineering, University of Bath, Bath, United Kingdom;

    Department of Chemical Engineering, University of Bath, Bath, United Kingdom;

    Department of Chemical Engineering, University of Bath, Bath, United Kingdom;

    Department of Chemical Engineering, University of Bath, Bath, United Kingdom;

    Department of Chemical Engineering, University of Bath, Bath, United Kingdom;

    Spivdruzhnist-T JSC, Kharkiv, Ukraine;

    Spivdruzhnist-T JSC, Kharkiv, Ukraine;

    Spivdruzhnist-T JSC, Kharkiv, Ukraine;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
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