Thermal response of a flat heat pipe sandwich structure to a localized heat flux |
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| Affiliation: | 1. Department of Mechanical, Aerospace and Nuclear Engineering, Rensselaer Polytechnic Institute, 110, 8th Street, Troy, NY 12180, USA;2. Center for Nanotechnology, Department of Mechanical Engineering, National Institute of Technology, Calicut 673 601, India;3. Material Science and Engineering Department, University of Virginia, Charlottesville, VA 22904, USA;1. School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510640, China;2. Faculty of Engineering, University of Nottingham, UK;1. School of Engineering, RMIT University, PO Box 71, Bundoora, Victoria, 3083, Australia;2. Thermal Engineering, Fujikura Automotive Europe GmbH, Manchinger Strasse 114, D-85053, Ingolstadt, Germany;3. Thermal Technology Division, Fujikura Ltd., 1-5-1, Kiba, Koto-ku, Tokyo, 135-8512, Japan;1. School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510640, China;2. Fluids & Thermal Engineering Research Group, Faculty of Engineering, University of Nottingham, UK |
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| Abstract: | The temperature distribution across a flat heat pipe sandwich structure, subjected to an intense localized thermal flux has been investigated both experimentally and computationally. The aluminum sandwich structure consisted of a pair of aluminum alloy face sheets, a truncated square honeycomb (cruciform) core, a nickel metal foam wick and distilled water as the working fluid. Heat was applied via a propane torch to the evaporator side of the flat heat pipe, while the condenser side was cooled via natural convective and radiative heat transfer. A novel method was developed to estimate experimentally, the heat flux distribution of the torch on the evaporator side. This heat flux distribution was modeled using a probability function and validated against the experimental data. Applying the estimated heat flux distribution as the surface boundary condition, a finite volume analysis was performed for the wall, wick and vapor core regions of the flat heat pipe to obtain the field variables in these domains. The results were found to agree well with the experimental data indicating the thermal spreading effect of the flat heat pipe. |
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