Share

Heat-transfer enhancement and pressure loss by surface roughness in turbulent channel flows.

Author(s) : KATOH K., CHOI K. S., AZUMA T.

Type of article: Article

Summary

The results confirmed that the efficiency of heat-transfer surfaces is in general less than unity when the molecular Prandtl number of the working fluid is less than the turbulent Prandtl number. When the molecular Prandtl number is greater than the turbulent Prandtl number, it was shown that the efficiency could be greater than unity as long as the surface roughness is transitional. It is suggested that the breakdown of the Reynolds analogy being experimentally observed for the riblet surface seems to be due to the inhomogeneity of the heat flux over the micro-grooves at the initial stage of thermal boundary-layer development.

Details

  • Original title: Heat-transfer enhancement and pressure loss by surface roughness in turbulent channel flows.
  • Record ID : 2001-2142
  • Languages: English
  • Source: International Journal of Heat and Mass Transfer - vol. 43 - n. 21
  • Publication date: 2000/11

Links


See other articles in this issue (3)
See the source

Indexing