Regensburg 2025 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 9: Poster
MM 9.41: Poster
Montag, 17. März 2025, 18:30–20:30, P1
A novel technique for measuring 3D thermal conductivity of carbon paper — •Oliver Roser1, Achour Mahfoudi1, Cornelius Hahn1, and Andreas Griesinger1,2 — 1Center for Heat Management (ZFW), Stuttgart — 2Baden-Wuerttemberg Cooperative State University (DHBW), Stuttgart
Gas diffusion layers based on carbon paper are used in various types of fuel cells. They make a significant contribution to dissipating the heat loss generated in the catalyst layers and homogenizing the temperature field. The material structure causes strongly direction-dependent thermal conductivities. It is not possible to determine the direction-dependent thermal conductivity under operating boundary conditions using existing methods. We present a newly developed technique with which thermal conductivity can be determined in all spatial directions. Measurements of thermal conductivity in the sample plane are carried out under steady-state boundary conditions. When measuring thermal conductivity through the sample plane, we use a transient measurement approach. The apparatus developed for this purpose and its components are presented. We show how to set and control the application-related boundary conditions such as temperature, surface pressure, moisture content and filling gas. The thermal measurements and evaluation strategies are presented, and the achievable accuracy of the method is discussed. Finally, we show initial measurement results that demonstrate a significant impact of direction, temperature and moisture content on thermal conductivity of gas diffusion layers, depending on the material structure.
Keywords: Anisotropic Heat Conduction; Thermal Conductivity Measurements; Carbon Paper; Fuel Cells; Gas Diffusion Layers