Turbulent Flow Over Rough Surfaces

The objective of the present study was to experimentally obtain a better understanding of the turbulent flow structure in repeated-rib geometry rough-walled surfaces in two size pipe systems as a function of the ratio of roughness height to spacing distance between the elements (P/K), the axial variation of the flow, and the flow rates. The variations in P/K geometries caused the flow structure to change from quasi-smooth flow regime (in low P/K values) to hyperturbulent flow regime (in medium P/K) to isolated-roughness-element flow regime at high P/K geometries. The repeated-rib geometries examined included P/K values of 2, 5, 7, 10, 13, 16, 19, 22, and 25 in the small pipe system and 2, 13, and 24 in the large pipe system.

Name thesis:degree_name

Ph.D.

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Nuclear Engineering

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2014

Author dc:creator

• Nourmohammadi, Khosrow

• Engineering, Nuclear

Identifier

(UMI)AAI8302942

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/70884