Pressure drop measurements for woven metal mesh screens used in electrical safety switchgears |
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| Institution: | 1. Université Clermont Auvergne, CNRS/IN2P3, LPC, Clermont-Ferrand F-63000, France;2. Centro de Matematica (CMAT), Campus de Gualtar, Universidade do Minho, Braga 4710 – 057, Portugal;3. LPC2E CNRS, 3A Avenue de la Recherche Scientifique, Orléans Cedex 2 45071, France;1. Centre for Environmental Safety and Risk Engineering (CESARE), Victoria University, Melbourne, Victoria 8001, Australia;2. School of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney, New South Wales 2006, Australia;1. Shaanxi Key Laboratory of Internal Aerodynamics in Aero-Engine, Xi''an 710072, China;2. Yangtze River Delta Research Institute of NPU, Northwestern Polytechnical University, Taicang, Jiangsu 215400, China;3. Beijing Institute of Aerospace Testing Technology, Beijing, China;4. Department of Mechanical & Process Engineering, ETH Zürich, Zürich 8093, Switzerland;5. School of Energy, Geoscience, Infrastructure and Society, Heriot-Watt University, Edinburgh, United Kingdom |
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| Abstract: | The paper deals with an experimental investigation of the pressure drops and friction factors induced by sets of metal woven screens in the case of an incompressible fluid flow, namely water flow. These woven screens are of metallic type and are used in electrical safety devices, especially at the end of exhaust duct of low voltage circuit breakers. In a first step, the whole of the set-up is used to check some approximations dedicated to pressure drops due to sphere beds around 275 µm and 375 µm as diameters. Results are discussed in terms of Darcyan and non-Darcyan permeabilities compared with published data and are analyzed in terms of the Blake-type friction factor. In the second step, the pressure drops are measured for stacks composed of eight different woven screens (of plain dutch type) formed with millimetric wires. Various formulations of the pressure drops and friction factors published elsewhere are tested with a special care dedicated to the choice of the geometry for the flow pattern (hydraulic diameter, spherical diameter, cylindrical diameter) and to the consideration of laminar and turbulent contribution. We then give the formulation that characterizes the fluid flowing through stacks of woven screens used in electrical safety applications. |
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