Newtonian liquid jet impaction on a high-speed moving surface |
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| Institution: | 1. Department of Mechanical Engineering, University of British Columbia, Vancouver, BC, Canada V6T 1Z4;2. Kelsan Technologies Corporation, 1140 West 15th Street, North Vancouver, BC, Canada V7P 1M9;1. Laboratory of Turbomachinery (LSM), Helmut-Schmidt-University, University of the Federal Armed Forces, Hamburg, Germany;2. Institute of Aerospace Thermodynamics, Stuttgart University, Stuttgart, Germany;3. Siemens Power and Gas Division, Huttenstr. 12, 10553 Berlin, Germany;1. Department of Mathematics, Visva-Bharati (A Central University), Santiniketan 731 235, West-Bengal, India;2. Ajhapur High School, Ajhapur, Burdwan 713 401, West-Bengal, India;1. Engineering Systems for Spanish Defense (ISDEFE), Beatriz de Bobadilla 3, 28040 Madrid, Spain;2. National Institute of Aerospace Technology (INTA), Carretera de Torrejón a Ajalvir Km 4, 28850 Madrid, Spain;3. Fluid Mechanics and Aerospace Propulsion Department, Universidad Politécnica de Madrid, Plaza del Cardenal Cisneros 3, 28040 Madrid, Spain |
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| Abstract: | In the railroad industry a friction modifying agent may be applied to the rail or wheel in the form of a liquid jet. In this mode of application the interaction between the high-speed liquid jet and a fast moving surface is important. Seven different Newtonian liquids with widely varying shear viscosities were tested to isolate the effect of viscosity from other fluid properties. Tests were also done on five surfaces of different roughness heights to investigate the effects of surface roughness. High-speed video imaging was employed to scrutinize the interaction between the impacting jet and the moving surface. For all surfaces, decreasing the Reynolds number reduced the incidence of splash and consequently enhanced the transfer efficiency. At the elevated Weber numbers of the testing, the Weber number had a much smaller impact on splash than the Reynolds number. The ratio of the surface velocity to the jet velocity has only a small effect on the splash, whereas increasing the roughness-height-to-jet-diameter ratio substantially decreased the splash threshold. |
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