燃料电池气体扩散层纤维孔隙特性对液态水传输的影响分析

doi:10.19562/j.chinasae.qcgc.2022.07.013

Abstract

Abstract:

The characteristics of the fiber pores inside the gas diffusion layer （GDL） of proton exchange membrane fuel cell （PEMFC） have significant effects on the liquid water transmission capability， and even the performance and service life of the fuel cell. In this paper， a gas-liquid two-phase model， which can capture the moving behavior of liquid water through the fiber pores of GDL， is established based on the fluid volume method， and the effects of the pore fraction， the cross section shape， the ratio of longitudinal spacing over lateral spacing of fibers and contact angle on the liquid water transmission capability inside GDL are analyzed. The results show that the ratio of longitudinal spacing over lateral spacing of fiber decides the moving direction of liquid water through its effects on the longitudinal and lateral capillary force， and the increase of contact angle along longitudinal direction can accelerate the climbing of liquid water， hence significantly enhancing the water drainage capacity of GDL.

Key words: PEMFC, gas diffusion layer, fluid volume method, liquid water transmission

Qingshan Liu,Fengchong Lan,Jiqing Chen,Junfeng Wang,Changjing Zeng. Analysis on Influence of Fiber Pore Characteristics on Liquid Water Transmission of Gas Diffusion Layer in PEMFC[J].Automotive Engineering, 2022, 44(7): 1069-1080.

Figures/Tables 23

纤维形状	$ε$	纤维横向间距/mm	纤维纵向间距/mm	$β$ /%	是否横向扩散	$δ m a x$ /%	峰值时间/ms	$δ m i n$ /%	谷值时间/ms	排水时间/ms
圆形	0.6	0.106 0	0.050	47.17	否	13.905	5.0	9.041	5.9	0.9
	0.7	0.106 0	0.133	125.47	是	39.124	15.6	31.517	16.9	1.3
	0.8	0.106 0	0.300	283.02	是	43.756	17.7	36.035	18.7	1.0
正六边形	0.6	0.142 1	0.022	15.48	否	18.011	6.6	8.296	7.9	1.3
	0.7	0.204 1	0.050	24.50	否	16.646	6.4	6.288	6.8	0.4
	0.8	0.243 1	0.133	54.71	否	14.309	5.7	4.143	6.3	0.6
正方形	0.6	0.146 0	0.090	61.64	否	12.095	4.4	2.179	6.1	1.7
	0.7	0.125 0	0.200	160.00	是	33.769	13.3	29.817	13.9	0.6
	0.8	0.272 0	0.200	73.53	否	13.025	5.2	6.510	5.7	0.5

References 13

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Analysis on Influence of Fiber Pore Characteristics on Liquid Water Transmission of Gas Diffusion Layer in PEMFC

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