Print Email Facebook Twitter Acoustical damping in a circular pipe with an air-water mixture flow: A new setup design Title Acoustical damping in a circular pipe with an air-water mixture flow: A new setup design Author Sanna, F. Golliard, J. Belfroid, S.P.C. Publication year 2016 Abstract Damping in pipes quantifies the attenuation of the pressure amplitude due to losses. Applications with mixtures of two immiscible phases are common but limited studies on damping with multiphase flows in pipes are available. The purpose of this work is to describe the setup as well as the post-processing used to quantify the acoustical damping in presence of a mixture of air and water at different conditions. In particular for the boundary conditions, a new solution is proposed both to be able to drive water in the system and to satisfy the requirement of anechoicity. Thus, damping has been successfully measured with and without gas mean flow, in presence of liquid or not. For the case without water, the model of Kirchhoff and the correction proposed by Dokumaci describe the visco-thermal losses and the convection effects. Analogously, to quantify the acoustic damping when quiescent liquid is laying at the bottom of the main pipe (without gas mean flow), it has been verified that the change of the hydraulic diameter due to the presence of water is the responsible of the increase. Subject Fluid & Solid MechanicsHTFD - Heat Transfer & Fluid DynamicsTS - Technical SciencesMechanicsIndustrial Innovation To reference this document use: http://resolver.tudelft.nl/uuid:b51a7ab3-3c5a-43f5-a90d-76c30a061fb2 TNO identifier 574347 Publisher TNO Source 11th International Conference on Flow-Induced Vibration, 4-6 July 2016, Delft, The Netherlands Document type conference paper Files To receive the publication files, please send an e-mail request to TNO Library.