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A Numerical Study on the Effect of a Microfin with a Flexible Up-down Movement on Heat Transfer using a Fluid-structure Interaction (FSI) Method  

Park, Ki-Hong (Department of Energy Engineering, Pusan National Univ.)
Min, June-Kee (Rolls-Royce University Technology Center, Pusan National Univ.)
Kim, Jin-Kyu (Rolls-Royce University Technology Center, Pusan National Univ.)
Kang, Seok-Hoon (Department of Precision Engineering, Pusan National Univ.)
Kim, Seong-Jin (Department of Precision Engineering, Pusan National Univ.)
Park, Sang-Hu (School of Mechanical Engineering, Pusan National Univ.)
Publication Information
Journal of the Korean Society for Precision Engineering / v.28, no.8, 2011 , pp. 975-983 More about this Journal
Abstract
A microfin on a heated surface and its effects of the heat transfer has been investigated. The thickness of the fin is about 8 micrometer to allow the flexible up-down motion of the fin. Two-way complete FSI (Fluid-Structure Interaction) method has been applied for the analysis. Firstly, the deformation of a microfin due to the pulsating flow is evaluated using structure analysis. The flow and temperature patterns are predicted by CFD (Computational Fluid Dynamics) method. At each time step, using the pressure force and temperature distribution from CFD, the deformation of the wing is evaluated by FEM. Also in order to estimate the resonance probability, the natural frequency of the wing structure is calculated by modal analysis. The proposed numerical procedure was validated through experiment using a single fin. Through this work, we show that the increase of 40% in heat transfer capacity using the microfin has been compared with that of flat plate case.
Keywords
Microfin; Two-way FSI; Pulsating Flow; CFD; Modal Analysis;
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