Natural convection simulation inside the underground conduit of an electrical power cable

Chun Lang Yeh, Keh Chin Chang

研究成果: Article同行評審

2 引文 斯高帕斯(Scopus)

摘要

The heat dissipation process inside a power cable conduit buried underground is characterized by the three-dimensional natural convection between horizontal, highly eccentric cylinders. The surface of the outer cylinder (concrete conduit) is assumed adiabatic, whereas a constant heat flux, representing heat generation from the power cable due to electrical resistance, is specified on the surface of the inner cylinder (power cable). Unlike the vertical configuration of eccentric annuli in which the fully developed thermal boundary conditions may be achievable, the boundary conditions at the open end of the present case are troublesome and are coped with by the zonal grid approach. Two cases with the modified Rayleigh numbers of 105 and 106 are investigated. A numerical study reveals that cable surface temperatures increase toward the outlet plane. It is also found that higher temperatures occur in the region near the bottom of the inner cylinder, where the cable contacts the concrete conduit (outer cylinder), due to small local Rayleigh numbers in which the characteristic length is defined in terms of radial distance between the inner and outer cylinders. As a result, the portion of the power cable near the contacting point with the concrete conduit will deteriorate earlier.

原文English
頁(從 - 到)557-565
頁數9
期刊Journal of thermophysics and heat transfer
14
發行號4
DOIs
出版狀態Published - 2000 1月 1

All Science Journal Classification (ASJC) codes

  • 凝聚態物理學
  • 航空工程
  • 機械工業
  • 流體流動和轉移過程
  • 空間與行星科學

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