Journal of Power Sources
Journal of Power Sources
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通讯作者：
John Collins;G. Kear;Xiaohong Li;C. Low;Derek Pletcher;R. Tangirala;Duncan Stratton-Campbell
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作者：
John Collins;G. Kear;Xiaohong Li;C. Low;Derek Pletcher;R. Tangirala;Duncan Stratton-Campbell
一种新的质子交换膜燃料电池气体扩散层面内导热系数的测定方法关键词：传导传热面内导热系数纤维多孔介质各向异性微结构聚四氟乙烯涂层a B s t r a c t气体扩散层（GDL）传热是质子交换膜燃料电池设计和运行中的一个关键环节。分析这一过程需要确定有效导热系数。由于GDL的各向异性微结构，这种输运性质在穿过平面和平面内方向上显著不同。本文介绍了一种新型的GDL面内有效导热系数和接触热阻分离试验台。使用具有不同聚四氟乙烯（PTFE）含量的Toray碳纸TGP-H-120样品在65-70 · C的平均温度下进行测量。的测量是由一个紧凑的分析模型，实现了良好的协议与实验数据的补充。在很宽的PTFE含量范围内，发现面内有效热导率保持近似恒定，k = 17.5 W m-1 K-1，并且其值比贯通面热导率高约12倍。
A novel approach to determine the in-plane thermal conductivity of gas diffusion layers in proton exchange membrane fuel cells Keywords: Conduction heat transfer In-plane thermal conductivity Fibrous porous media Anisotropic micro-structure Polytetrafluoroethylene coating a b s t r a c t Heat transfer through the gas diffusion layer (GDL) is a key process in the design and operation of a proton exchange membrane (PEM) fuel cell. The analysis of this process requires determination of the effective thermal conductivity. This transport property differs significantly in the through-plane and in-plane directions due to the anisotropic micro-structure of the GDL. A novel test bed that allows separation of in-plane effective thermal conductivity and thermal contact resistance in GDLs is described in this paper. Measurements are performed using Toray carbon paper TGP-H-120 samples with varying polytetrafluoroethylene (PTFE) content at a mean temperature of 65–70 • C. The measurements are complemented by a compact analytical model that achieves good agreement with experimental data. The in-plane effective thermal conductivity is found to remain approximately constant, k ≈ 17.5 W m −1 K −1 , over a wide range of PTFE content, and its value is about 12 times higher than that for through-plane conductivity.