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김민신(Minsin Kim),김영우(Youngwoo Kim),호쎄니 사자드(Sajjad Hosseini),김경천(Kyung Chun Kim) 대한기계학회 2020 대한기계학회 춘추학술대회 Vol.2020 No.12
Metal foam is a metallic sponge which consists of many struts and nodes interconnect the struts. The struts are the product of Plateau borders and they form irregular cellular configurations. This metal foam structures have been of interest because their geometrical characteristics are theoretically desirable to many applications such as heat exchanger, chemical reactor, filter, etc. A test section with a 3-D printed 8 times scaled-up transparent metal foam replica has been prepared. Time-resolved 2-D particle image velocimetry was used to measure velocity fields in the center planes at upstream, inside, and downstream of the replica model. When a turbulent flow with a turbulence intensity of 10% is introduced, the turbulent intensity increases while passing through the metal foam replica. The turbulence decays after the replica due to the shear-free uniform flow and all the enhanced turbulence recover to initial state. The random vortex structures decay quickly in downstream of the metal foam. The decay exponent for decay power law is -0.6. This represents there is no turbulence production in downstream.