Test results of friction factor for round-hole roughness surfaces in closely spaced channel flow of water |
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Authors: | Email author" target="_blank">Tae?Woong?HaEmail author |
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Affiliation: | (1) Mechanical Engineering Department, Kyungwon University, 461-701 Sungnam, Korea |
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Abstract: | For examining friction-factor characteristics of round-hole pattern surfaces which are usually applied on damper seals, flat
plate test apparatus is designed and fabricated. The measurement method of leakage and pressure distribution along round-hole
pattern specimen with different hole area is described and a method for determining the Fanning friction factor is discussed.
Results show that the round-hole pattern surfaces provide a much larger friction factor than smooth surface, and the friction
factor vs. clearance behavior yields that the friction factor generally decreases as the clearance increases unlike the results
of Nava’s flat plate test. As the hole depth is decreased, the friction factor is increased, and maximum friction factor is
obtained for 50% of hole area. Since the present experimental friction factor results show coincident characteristics with
Moody’s friction factor model, empirical friction factors for round-hole pattern surfaces are obtained by using the Moody’s
formula based on curve-fit of the experimental data. Results of Villasmil’s 2D CFD simulation support the present experimental
test result. |
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Keywords: | Friction Factor Flat Plate Tester Round-Hole Pattern Surface Moody Friction Factor Model Damper Seal |
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