The critical heat transfer characteristics of an insulated oval duct

King Leung Wong, Wen Lih Chen, Tsung Lieh Hsien, Huann Ming Chou

研究成果: Article同行評審

4 引文 斯高帕斯(Scopus)

摘要

This study is to investigate the characteristics of critical and neutral thicknesses of an insulated oval duct by using two-dimensional numerical analysis and the one-dimensional PWTR model, coupled with accurate oval duct surfaces. Critical heat transfer occurs when the outer radius of an insulated circular duct is less than its critical insulation radius. The heat transfer rate increases with increasing the insulation thickness until the maximum value is reached at the critical insulated thickness, then it decreases until the point of neutral thickness, where the heat transfer rate is the same as that of a non-insulated duct. Thus, any insulation effort is meaningless if the insulation thickness is less than the neutral insulated thickness. These characteristics are very important for small size insulated duct, especially in conditions of low ambient air/gas convective coefficients. It shows in this study that the critical phenomena of an insulated oval duct is very similar to those of an insulated circular duct except it's critical and neutral thicknesses are smaller for larger oval axes ratio.

原文English
頁(從 - 到)1442-1448
頁數7
期刊Energy Conversion and Management
51
發行號7
DOIs
出版狀態Published - 2010 七月

All Science Journal Classification (ASJC) codes

  • 可再生能源、永續發展與環境
  • 核能與工程
  • 燃料技術
  • 能源工程與電力技術

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