Open AccessExperimental investigation to determine equivalent sand grain for very rough hydraulic surfaces
Author(s) -
Jonathan Nicolle,
Brian Hazel,
Hélène Gauthier
Publication year - 2021
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/774/1/012129
Subject(s) - hydraulics , hydraulic roughness , surface finish , geotechnical engineering , reynolds number , surface roughness , scale (ratio) , flow (mathematics) , cylinder , hydraulic head , grain size , geology , materials science , mechanics , geometry , turbulence , mathematics , engineering , composite material , physics , quantum mechanics , aerospace engineering
Considering the actual roughness shape, distribution and orientation found on hydraulics surfaces, obtaining a sand grain equivalent for loss evaluation remains a challenge. To investigate this problem, a variety of surfaces ranging from hydraulically smooth to a very rough surface representing a heavily rusted penstock were tested on an experimental cylinder rotating in water. The larger-scale roughness was replicated through rapid prototyping. The surface effect on the flow for an increasing Reynolds number was measured and the resulting equivalent sand grain was validated against experimental intake head loss measurements.