点击此处 ,将本页翻译成中文
将本页翻译成中文
您现在的位置:首页> 外文学位 >文献详情
【6h】

A theoretical and experimental study on the particulate fouling of tubes having two-dimensional roughness.

【摘要】 A theoretical and experimental study of particulate fouling in repeated rib tubes is presented. A rationally based fouling model is developed. This is the first attempt to model fouling in enhanced tubes. The model, with experimentally determined sticking probability and deposit bond strength, can predict the fouling behaviour of repeated rib tubes.;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 mass transfer coefficients for the repeated rib tubes are obtained from the corresponding heat transfer correlations. The wall shear stress is modeled based on the flow structure between the ribs.;Particulate fouling tests were conducted. The range of variables investigated in this study are the roughness variables (0.015 ;Empirical correlations were developed that define the effect of geometric and flow parameters on the sticking probability and deposit bond strength. These correlations show that the sticking probability and deposit bond strength increase as p/e increases, and as e/D and Reynolds number decreases.;An analysis was performed that accounts for forces acting on the particles at the wall. The analysis suggests that the hydrodynamic force is dominant for the present tests. This analysis qualitatively supports the empirically obtained geometric and Reynolds number dependencies of the sticking probability.;The repeated rib tubes showed higher fouling resistances than did the smooth tube at low Reynolds numbers. At a high Reynolds number (Re = 26,000), however, they were approximately the same as the smooth tube value. Within the test range, the fouling resistance increases as p/e increases, and as e/D and Reynolds number decreases.

【作者】 Kim, Nae-Hyun.;

【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(卷),期】1989(),

【年度】1989

【页码】226 p.

【总页数】226

【原文格式】PDF

【正文语种】eng

【中图分类】;

【原文服务方】国家工程技术数字图书馆

【关键词】;

联系方式:18141920177 (微信同号)

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号