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A theoretical and experimental study of fouling in enhanced tubes in cooling tower systems.

机译:冷却塔系统中增强管结垢的理论和实验研究。

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摘要

A theoretical and experimental study on the particulate fouling and CP&PF (combination of particulate fouling and precipitation fouling in cooling tower systems) in enhanced tubes with helical rib roughness geometry was presented. A new theoretical fouling model--oscillatory asymptotic model is developed. It can embrace all the six categories of fouling behavior. Two semi-empirical fouling models applicable to helical rib tubes are specified. They are the first attempts to model fouling on helical rib tubes. The first is an oscillatory asymptotic fouling model which can be used to predict the fouling potential of helical rib tubes in shell-tube condensers in real cooling tower systems. The other model is about accelerated particulate fouling. The possibility was tested that the relative CP&PF characteristics can be inferred from that of particulate fouling. The analogy between these two kinds of fouling was proved. This is the first attempt to consider these two kinds of fouling mechanisms simultaneously. The mass transfer rate is assumed to control the particle transport process, and the wall shear stress is assumed to control the removal process. The models, with experimentally determined sticking probability and deposit bond strength, can predict the fouling behavior of this kind of tubes.
机译:提出了在具有螺旋肋粗糙度几何形状的增强管中的颗粒结垢和CP&PF(冷却塔系统中颗粒结垢与沉淀结垢的组合)的理论和实验研究。建立了一种新的理论结垢模型-振荡渐近模型。它可以包含所有六种污垢行为。指定了两种适用于螺旋肋管的半经验结垢模型。他们是对螺旋肋管上的污垢进行建模的首次尝试。第一个是振荡渐近结垢模型,可用于预测实际冷却塔系统中壳管式冷凝器中螺旋肋管的结垢潜力。另一个模型是关于加速颗粒结垢。测试了从颗粒污染推断出相对CP&PF特性的可能性。证明了这两种污垢之间的类比。这是同时考虑这两种结垢机制的首次尝试。假定传质速率控制颗粒的输送过程,假定壁切应力控制去除过程。这些模型具有实验确定的粘着概率和沉积物粘结强度,可以预测此类管的结垢行为。

著录项

  • 作者

    Li, Wei.;

  • 作者单位

    The Pennsylvania State University.;

  • 授予单位 The Pennsylvania State University.;
  • 学科 Engineering Mechanical.
  • 学位 Ph.D.
  • 年度 1998
  • 页码 257 p.
  • 总页数 257
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

  • 入库时间 2022-08-17 11:48:38

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