Document Type : Research Paper
Authors
1 National School for Water and Environmental Engineering of Strasbourg (ENGEES) – ICube (University of Strasbourg, CNRS, INSA of Strasbourg, ENGEES), Mechanics Department, Fluid Mechanics Team ENGEES, 1 Quai Koch BP 61039 67070 Strasbourg cedex France.
2 National School for Water and Environmental Engineering of Strasbourg (ENGEES)
Abstract
Venturi flumes are measurement structures commonly used in water systems to measure the flow discharge. Some of them are not well installed or present some geometrical defects. The objective of this study is to investigate the hydraulic influence of a number of typical wrong installations and geometrical defects of long-throated Venturi flumes: significant positive or adverse slopes, humps and hollows on the walls of the throat, hump or hollow on the bed of the throat. The geometric tolerances corresponding to an acceptable tolerance on the discharge of 2% and 5% are calculated for each defect. A number of corrections of the head –discharge relationship are proposed to avoid the destruction of a flume if the geometric tolerance is not respected.
Keywords
Dabrowski W., Polak U., Improvements in flow rate measurement by flumes, Journal of Hydraulic Engineering 138 (2012) 757-763.
Dufresne M., Vazquez J., Head–discharge relationship of Venturi flumes: from long to short throats, Journal of Hydraulic Research 51 (2013) 465-468.
ERCOFTAC, Special interest group on "quality and trust in industrial CFD" – Best practice guidelines, European Research Community On Flow, Turbulence and Combustion, (2000).
Hager W.H., Wastewater hydraulics–Theory and Practice, Springer, (1999).
ISO, Liquid flow measurement in open channels – Rectangular, trapezoidal and U-shaped flumes, International Standardization Organization, ISO 4359:2012, (2012).
Open FOAM, Open FOAM – The open source CFD toolbox – User guide, Open FOAM Foundation (2013).
Roache P.J., Perspective: a method for uniform reporting of grid refinement studies, Journal of Fluids Engineering 116 (1994) 405-413.
Yeung H., An examination of BS3680 4C (ISO/DIS 4369) on the measurement of liquid flow in open channels-flumes, Flow Measurement and Instrumentation 18 (2007) 175-182.
)