Romanova, Anna V., Horoshenkov, Kirill V. and Krynkin, Anton (2018) Dynamically rough boundary scattering effect on a propagating continuous acoustical wave in a circular pipe with flow. Sensors, 18:1098. ISSN 1424-8220 (Online) (doi:https://doi.org/10.3390/s18041098)

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Abstract

The pattern of the free surface of the turbulent flow in a partially filled circular pipe contains information on the underlying hydraulic processes. However, the roughness of the free surface of flow and its temporal variation in a pipe is a dynamic and non-stationary process that is difficult to measure directly. This work examines a new acoustic method that is used to study the characteristics of the free surface roughness under controlled laboratory conditions. The acoustic method makes use of a continuous sine wave that is transmitted through the air above the turbulent flow of water over a section of the pipe instrumented with an array of wave probes and microphones. The results obtained for a representative range of flow regimes and variety of pipe bed conditions illustrate that it is possible to unambiguously relate variations in the recorded acoustic field to the standard deviation in the free surface roughness and mean flow depth. These variations are clearly linked to the hydraulic friction factor of the pipe, which is shown to be related to airborne acoustic data obtained non-invasively.

Item Type:	Article
Additional Information:	© 2018 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
Uncontrolled Keywords:	boundary scattering; dynamic roughness; sine wave; pipe flow; pipe acoustics
Subjects:	T Technology > TA Engineering (General). Civil engineering (General)
Faculty / School / Research Centre / Research Group:	Faculty of Engineering & Science Faculty of Engineering & Science > Designing for Sustainability Research Theme Faculty of Engineering & Science > School of Engineering (ENG)
Last Modified:	18 Sep 2020 23:35
URI:	http://gala.gre.ac.uk/id/eprint/19909

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