Mechanism of interaction of pressure waves at a discrete partial blockage |
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| Institution: | 1. Colorado School of Mines, Chemical & Biological Engineering Department, Center for Hydrate Research, Golden, CO 80401, USA;2. The University of Western Australia, Centre for Energy, Crawley, Western Australia 6009, Australia;1. Università della Calabria, Dipartimento di Ingegneria Informatica, Modellistica, Elettronica e Sistemistica - DIMES, Via P. Bucci, 87036 Rende, CS, Italy;2. Università degli Studi di Udine, Dipartimento Politecnico di Ingegneria e Architettura, via Cotonificio 114, 33100 Udine, UD, Italy;3. Università degli Studi di Sassari, Dipartimento di Architettura, Design e Urbanistica, Asilo Sella, via Garibaldi 35, 07041 Alghero, SS, Italy;1. Research Institute for Geo-hydrological Protection, National Research Council, Via Madonna Alta 126, 06128 Perugia, Italy;2. Dipartimento di Ingegneria Civile e Ambientale, University of Perugia, Via G. Duranti 93,06125 Perugia, Italy;3. Department of Hydrology and Water Resources, The University of Arizona. 1133 E James E. Rogers Way, Tucson, AZ 85721 |
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| Abstract: | This paper analyses the mechanism of interaction between an incident pressure wave and blockages of different geometrical characteristics (i.e., a butterfly and a ball valves, two short stretches of pipe with a reduced diameter, and a device simulating a longitudinal body blockage) by means of laboratory and numerical tests. Experiments have shown that the mechanism of interaction with pressure waves is influenced by their path through the device: sinuous because of the device body for partially closed in-line valves (type I mechanism), and straight for the small bore pipe devices (type II mechanism). Type I mechanism is characterized by a rise followed by an almost constant value whereas in type II one a drop occurs after the rise. To complete the investigation the effect of the pre-transient condition is discussed. |
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| Keywords: | Partial blockage Transient tests Pipe diagnosis Pressure waves In-line valves |
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