Accession Number:

ADA229979

Title:

Investigations of Surface Roughness Effects on Turbulent Flow and Heat Transfer

Descriptive Note:

Final rept. 15 May 1986-14 Sep 1990,

Corporate Author:

MISSISSIPPI STATE UNIV MISSISSIPPI STATE DEPT OF MECHANICAL AND NUCLEAR ENGINEERING

Report Date:

1990-10-01

Pagination or Media Count:

270.0

Abstract:

The primary objective of this research program was to investigate the effects of surface roughness on turbulent boundary layer heat transfer by obtaining accurate, comprehensive, quality heat transfer data for zero pressure gradient incompressible air flow over constant temperature test surfaces with well-defined surface roughness geometries. Knowledge gained from the experimental investigation was used to improve and extend the roughness energy transport model used in the discrete element prediction method, thus enhancing and expanding the capability to predict the effects of surface roughness on turbulent flow and heat transfer. Fluid dynamics and heat transfer data for turbulent boundary layer flow over a smooth and five rough surfaces were taken in the Turbulent Heat Transfer Test Facility THTTF for x-Reynolds numbers ranging up to 10,000,000. The smooth wall data was used for qualification of the THTTF and provided base line data for comparison with the data from rough surfaces.

Subject Categories:

  • Fluid Mechanics
  • Thermodynamics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE