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Axial wall conduction preheating effects in high Péclet number laminar forced convection.

Author(s) : PIVA S.

Type of article: Article

Summary

Laminar forced convection heat transfer inside ducts is usually analysed with the thermal boundary condition imposed directly to the fluid boundary, i. e. at the inside wall of the duct. However, in practical applications the thermal boundary condition is specified at the outer surface of the duct. The geometry of interest consists of a long circular tube heated for a finite or semi-finite lenght. It is proved that in the preheating region the wall heat flux varies with exponential law in the streamwise direction, so that the temperature profile becomes fully developed. Moreover, an exact functional relation between the exponent of the wall heat flux distribution and a single parameter, which depends on the Péclet number and the wall conductance, is derived. The practical significance of the analysis is finally discussed.

Details

  • Original title: Axial wall conduction preheating effects in high Péclet number laminar forced convection.
  • Record ID : 1997-1391
  • Languages: English
  • Source: International Journal of Heat and Mass Transfer - vol. 39 - n. 16
  • Publication date: 1996/11

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