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学者姓名：郭航
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Abstract ：
Orientated-type flow channels of proton exchange membrane fuel cells having baffles increase the cell performance, however, the higher power loss accounted by baffles, is a non-ignorable disadvantage. Previous literature proves that the baffles in channels cause the increase in power losses, while how the baffles affect the power losses, including the frictional losses and local losses, are still not analyzed before. Therefore, in this paper, a two-dimensional model is developed to study the friction loss and local loss in the flow channels with baffles. The numerical model, which couples the non-Darcy flow effect, is validated by comparing with self-conducted experimental results. Experimental and simulation results reveal that: orientated-type flow channels facilitate enhance the power output, and with the enlargement of baffles, the performance is further enhanced. In addition, the frictional losses and local losses in the orientated-type flow channels are comparatively studied by a numerical approach for the first time. It is found that using the materials with low surface roughness can decrease the friction loss; and avoiding sudden expanded segments at leeward sides of baffles can reduce the local loss. The experimental results and simulation results can further help improve the flow channel design. (c) 2021 Elsevier Ltd. All rights reserved.
Keyword ：
Orientated-type flow channel Orientated-type flow channel Local loss Local loss Frictional loss Frictional loss Flow channel design Flow channel design Proton exchange membrane fuel cell Proton exchange membrane fuel cell
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| GB/T 7714 | Chen, Hao , Guo, Hang , Ye, Fang et al. Cell performance and flow losses of proton exchange membrane fuel cells with orientated-type flow channels [J]. | RENEWABLE ENERGY , 2022 , 181 : 1338-1352 . |
| MLA | Chen, Hao et al. "Cell performance and flow losses of proton exchange membrane fuel cells with orientated-type flow channels" . | RENEWABLE ENERGY 181 (2022) : 1338-1352 . |
| APA | Chen, Hao , Guo, Hang , Ye, Fang , Fang, Chong . Cell performance and flow losses of proton exchange membrane fuel cells with orientated-type flow channels . | RENEWABLE ENERGY , 2022 , 181 , 1338-1352 . |
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Abstract ：
一种增强阴极水反补阳极能力的被动式直接甲醇燃料电池属于质子交换膜燃料电池领域。结构包括甲醇溶液存储腔、穿孔板、蒸气腔、绝缘垫片、阳极集流板、复合膜电极、阴极集流板、阴极空气自呼吸腔，各部件之间利用孔通过绝缘螺栓和螺母进行连接和固定。该电池利用聚乙烯醇膜将阴极生成的水输回阳极，缓解阴极水淹的问题、缓解阳极甲醇穿透的问题、减缓阳极催化剂中毒的速度、保证质子交换膜的含水量；提升了燃料电池的输出功率、能量转化率和使用寿命。使得直接甲醇燃料电池能够使用较高浓度甲醇溶液或纯甲醇作为燃料正常工作，提升电池的总发电量。
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| GB/T 7714 | 叶芳 , 杨绍琛 , 郭航 et al. 一种增强阴极水反补阳极能力的被动式直接甲醇燃料电池 : CN202211406117.0[P]. | 2022-11-10 . |
| MLA | 叶芳 et al. "一种增强阴极水反补阳极能力的被动式直接甲醇燃料电池" : CN202211406117.0. | 2022-11-10 . |
| APA | 叶芳 , 杨绍琛 , 郭航 , 陈浩 . 一种增强阴极水反补阳极能力的被动式直接甲醇燃料电池 : CN202211406117.0. | 2022-11-10 . |
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Abstract ：
Proton exchange membrane fuel cells are widely utilized in the areas of aerospace, military and vehicles. Enhancing the reactant transportation and improving water, heat management can effectively increase the electrochemical reaction rate and power output. Orientated-type flow channels have been proved to be effective on improving mass transporting and enhancing performance. In this study, a flow field plate with transparent observation window, whose channel side wall is designed as transparent side-plates, is fabricated to achieve the side-view observation on liquid movement behaviors inside fuel cells. The visualization results of reactant gas and liquid water generation and flowing behaviors in channel regions are observed through the side direction for the first time. Experimental results infer that: orientated-type flow channels having baffles affect droplet generation, moving and shape in gas flow channels, and higher current densities result in more liquid water generation. The baffle downstream region having sudden expanded region slows down droplet moving, and baffle upstream sides accelerates droplet moving. Moreover, the generated heat of electrochemical reaction cannot satisfy maintaining a higher cell working temperature requirement, and an extra heating procedure is required.(c) 2022 Elsevier Ltd. All rights reserved.
Keyword ：
Side-view observation method Side-view observation method Two-phase flow Two-phase flow Orientated-type gas channel Orientated-type gas channel Mass transportation Mass transportation Proton exchange membrane fuel cell Proton exchange membrane fuel cell
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| GB/T 7714 | Guo, Hang , Zhao, Qiang , Ye, Fang . An experimental study on gas and liquid two-phase flow in orientated-type flow channels of proton exchange membrane fuel cells by using a side-view method [J]. | RENEWABLE ENERGY , 2022 , 188 : 603-618 . |
| MLA | Guo, Hang et al. "An experimental study on gas and liquid two-phase flow in orientated-type flow channels of proton exchange membrane fuel cells by using a side-view method" . | RENEWABLE ENERGY 188 (2022) : 603-618 . |
| APA | Guo, Hang , Zhao, Qiang , Ye, Fang . An experimental study on gas and liquid two-phase flow in orientated-type flow channels of proton exchange membrane fuel cells by using a side-view method . | RENEWABLE ENERGY , 2022 , 188 , 603-618 . |
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Abstract ：
低熔点熔融盐管内强迫对流换热的实验研究
Keyword ：
熔融盐 熔融盐 换热器 换热器 太阳能 太阳能 传热 传热 强迫对流 强迫对流 蓄热 蓄热
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| GB/T 7714 | 陈虎 , 吴玉庭 , 郭航 et al. 低熔点熔融盐管内强迫对流换热的实验研究 [J]. | 陈虎 , 2021 , 42 (2) : 25-30 . |
| MLA | 陈虎 et al. "低熔点熔融盐管内强迫对流换热的实验研究" . | 陈虎 42 . 2 (2021) : 25-30 . |
| APA | 陈虎 , 吴玉庭 , 郭航 , 陈夏 , 鹿院卫 , 马重芳 et al. 低熔点熔融盐管内强迫对流换热的实验研究 . | 陈虎 , 2021 , 42 (2) , 25-30 . |
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Abstract ：
利用课题组自行配制的二元混合熔融盐(KNO_3-Ca(NO_3)_2)开展导热油与低熔点熔融盐的管内强制对流实验研究。通过实验得到导热油与低熔点熔融盐的总换热系数,并通过最小二乘法和Wilson分离法得到了管内低熔点熔融盐侧的对流换热系数及其准则关联式。与不同的经典传热关联式对比,最大偏差为+23%。考虑高温熔融盐的变物性特征,利用黏度项对Dittus-Boelter方程关联式进行修正。经过修正后的Dittus-Boelter方程与实验测试结果最大偏差为-15%,偏差值明显减小。过渡流实验数据和Hausen方程及Gnielinski方程的最大偏差均为10%,实验结果验证了传热关系式仍适用于高温...
Keyword ：
传热 传热 太阳能 太阳能 强迫对流 强迫对流 换热器 换热器 熔融盐 熔融盐 蓄热 蓄热
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| GB/T 7714 | 陈虎 , 吴玉庭 , 郭航 et al. 低熔点熔融盐管内强迫对流换热的实验研究 [J]. | 太阳能学报 , 2021 , 42 (02) : 25-30 . |
| MLA | 陈虎 et al. "低熔点熔融盐管内强迫对流换热的实验研究" . | 太阳能学报 42 . 02 (2021) : 25-30 . |
| APA | 陈虎 , 吴玉庭 , 郭航 , 陈夏 , 鹿院卫 , 马重芳 . 低熔点熔融盐管内强迫对流换热的实验研究 . | 太阳能学报 , 2021 , 42 (02) , 25-30 . |
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Abstract ：
Orientated-type flow channels having porous blocks enhance the reactant transfer into gas diffusion layers of proton exchange membrane fuel cells. However, because of the blockages accounted by baffles and porous blocks in channel regions, pumping power increases. In this study, with the aim of further reducing the pumping power in flow channels with porous-blocked baffles, an orientated-type flow channel with streamline baffles having porous blocks is proposed. By employing an improved two-fluid model, cell performance, liquid water distribution and pumping power in a single flow channel are numerically studied. The simulation results show that the baffles with porous blocks increase the cell performance, and the streamline baffles with larger volumes further increase the performance; the produced water in porous regions is ejected more under inertial effect, especially at the regions near to baffles in gas diffusion layers and inside porous blocks. In addition, by using the streamline baffles, the excessive increase in power loss is further reduced. Moreover, the location and porosity effects of baffles with porous blocks are analyzed. Simulation results show that the location exhibits obscure effects on reactant transfer and cell performance, while the liquid water can be removed more when the porous blocked baffles are concentrated at downstream. The net power is enhanced more when using three porous blocks with the porosity of 0.00. (c) 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
Keyword ：
Flow channel design Flow channel design Forchheimer's effect Forchheimer's effect Mass transfer Mass transfer Orientated-type flow channel Orientated-type flow channel Proton exchange membrane fuel cell Proton exchange membrane fuel cell
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| GB/T 7714 | Chen, Hao , Guo, Hang , Ye, Fang et al. A numerical study of orientated-type flow channels with porous-blocked baffles of proton exchange membrane fuel cells [J]. | INTERNATIONAL JOURNAL OF HYDROGEN ENERGY , 2021 , 46 (57) : 29443-29458 . |
| MLA | Chen, Hao et al. "A numerical study of orientated-type flow channels with porous-blocked baffles of proton exchange membrane fuel cells" . | INTERNATIONAL JOURNAL OF HYDROGEN ENERGY 46 . 57 (2021) : 29443-29458 . |
| APA | Chen, Hao , Guo, Hang , Ye, Fang , Ma, Chong Fang . A numerical study of orientated-type flow channels with porous-blocked baffles of proton exchange membrane fuel cells . | INTERNATIONAL JOURNAL OF HYDROGEN ENERGY , 2021 , 46 (57) , 29443-29458 . |
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Abstract ：
Orientated-type flow channels of proton exchange membrane fuel cells cause non-Darcy effect occurring in flow regions. Therefore, the species transportation is affected by inertial effect. However, how the inertial force affects convection and diffusion of different species has not been discussed before. Thus, a modified two-dimensional, non-isothermal, two-phase and steady state model considering non-Darcy effect is employed in this study, and reactants and products transportations through diffusion and convection under inertial effects are quantitatively analyzed for the first time. Simulation results reveal that the convective transportation of reactants increases more under the influence of inertial force; water vapor transportation through convection increases the water content in porous regions. At the same time, liquid water expels more rapidly from gas diffusion layers under baffle regions, and enlarging baffle volumes increases the regions where the liquid water is rapidly removed under the inertial effect. (c) 2021 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
Keyword ：
Non-Darcy flow effect Non-Darcy flow effect Orientated-type flow channel Orientated-type flow channel Proton exchange membrane fuel cell Proton exchange membrane fuel cell Reactant utilization rate Reactant utilization rate Two-phase mass transfer Two-phase mass transfer
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| GB/T 7714 | Chen, Hao , Guo, Hang , Ye, Fang et al. Improving two-phase mass transportation under Non-Darcy flow effect in orientated-type flow channels of proton exchange membrane fuel cells [J]. | INTERNATIONAL JOURNAL OF HYDROGEN ENERGY , 2021 , 46 (41) : 21600-21618 . |
| MLA | Chen, Hao et al. "Improving two-phase mass transportation under Non-Darcy flow effect in orientated-type flow channels of proton exchange membrane fuel cells" . | INTERNATIONAL JOURNAL OF HYDROGEN ENERGY 46 . 41 (2021) : 21600-21618 . |
| APA | Chen, Hao , Guo, Hang , Ye, Fang , Ma, Chong Fang . Improving two-phase mass transportation under Non-Darcy flow effect in orientated-type flow channels of proton exchange membrane fuel cells . | INTERNATIONAL JOURNAL OF HYDROGEN ENERGY , 2021 , 46 (41) , 21600-21618 . |
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Abstract ：
In this study, a two-dimensional, two-phase, non-isothermal, and un-steady state unitized regenerative fuel cell model is established. The effect of various operating conditions on the variation trend of parameters and cell performance during mode switching from fuel cell to electrolytic cell mode is studied when using an elliptically shallow flow channel. Three operating parameter conditions are discussed, including inlet gas velocity, electrolytic cell voltage and water supply velocity. The effects of various operating conditions on cell performance and parameters are compared. The results show that different operating conditions have different effects on cell performance. When switching from fuel cell mode to electrolytic cell mode, changing the stoichiometric ratio of inlet gas velocity does not affect the cell performance after mode switching. The cell performance can be improved gradually with the increase in electrolytic cell voltage. Increasing the flow rate of liquid water can effectively speed up the stabilization time, however, the cell performance is slightly reduced, and it is easy to accumulate oxygen at the outlet.
Keyword ：
Unitized regenerative fuel cell Unitized regenerative fuel cell mode switching mode switching operating conditions operating conditions dynamic response dynamic response elliptically shallow flow channel elliptically shallow flow channel
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| GB/T 7714 | Song, Jia , Guo, Hang , Ye, Fang et al. A numerical investigation of operating condition effects on unitized regenerative fuel cells with elliptically shallow channel during mode switching [J]. | INTERNATIONAL JOURNAL OF GREEN ENERGY , 2021 , 19 (7) : 719-732 . |
| MLA | Song, Jia et al. "A numerical investigation of operating condition effects on unitized regenerative fuel cells with elliptically shallow channel during mode switching" . | INTERNATIONAL JOURNAL OF GREEN ENERGY 19 . 7 (2021) : 719-732 . |
| APA | Song, Jia , Guo, Hang , Ye, Fang , Ma, Chong Fang . A numerical investigation of operating condition effects on unitized regenerative fuel cells with elliptically shallow channel during mode switching . | INTERNATIONAL JOURNAL OF GREEN ENERGY , 2021 , 19 (7) , 719-732 . |
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Abstract ：
Reactants and products distribute unevenly in flow channels of proton exchange membrane fuel cells, therefore, the baffle heights and locations in flow channels exhibit effects on species transportation. In this study, a two-dimensional, two-phase, non-isothermal, and steady state model is developed to study the baffle heights and locations effects on mass transportation and performance of the fuel cells with orientated-type channels. Simulation results show that: uniformly distributing baffles in a flow channel can both enhance the reactants transportation and help expel more liquid water, resulting in higher net powers; although using a big baffle at the upstream segment of a channel enhances the performance more, while the water accumulating is also increased more. Reducing the baffle heights accounts for weaker reactants transfer enhancements and worse liquid water expelling; moving the baffles backwardly also causes the decrease in reactant transportation, while the liquid water expelling process is increased. (C) 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
Keyword ：
Two-phase mass transfer Two-phase mass transfer Proton exchange membrane fuel cell Proton exchange membrane fuel cell Baffle location Baffle location Baffle dimension Baffle dimension Orientated-type flow channel Orientated-type flow channel
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| GB/T 7714 | Chen, Hao , Guo, Hang , Ye, Fang et al. A numerical study of baffle height and location effects on mass transfer of proton exchange membrane fuel cells with orientated-type flow channels [J]. | INTERNATIONAL JOURNAL OF HYDROGEN ENERGY , 2021 , 46 (10) : 7528-7545 . |
| MLA | Chen, Hao et al. "A numerical study of baffle height and location effects on mass transfer of proton exchange membrane fuel cells with orientated-type flow channels" . | INTERNATIONAL JOURNAL OF HYDROGEN ENERGY 46 . 10 (2021) : 7528-7545 . |
| APA | Chen, Hao , Guo, Hang , Ye, Fang , Ma, Chong Fang . A numerical study of baffle height and location effects on mass transfer of proton exchange membrane fuel cells with orientated-type flow channels . | INTERNATIONAL JOURNAL OF HYDROGEN ENERGY , 2021 , 46 (10) , 7528-7545 . |
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Abstract ：
本发明公开了一种平行流场与蛇形流场自动切换的燃料电池自适应流场板，流场板的结构包括：反应物进口和出口，进口总管和出口总管，流场板上设有若干条脊、流道和四周的流场板壁，总管两侧壁面上的凹槽以及布置的自适应结构。当总管中有积存的液态水时，流场中的自适应结构吸水膨胀，总管局部横截面积逐渐变小，甚至堵住总管，使流场板局部或全部从平行状流场变为蛇形流场；当总管中不再有积存的液态水时，在电池运行温度下受到气流吹扫，内部水分蒸发，自适应结构脱水收缩，变为平行流场。本发明能够根据总管中液态水含量发生自适应变化，适应不同的工况，加快液态水的移出，避免水淹现象，并减小泵功消耗，提升电池净功率的效果。
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| GB/T 7714 | 郭航 , 牟禹辉 , 叶芳 . 平行流场与蛇形流场自动切换的燃料电池液态水自适应流场板 : CN202111178528.4[P]. | 2021-10-10 . |
| MLA | 郭航 et al. "平行流场与蛇形流场自动切换的燃料电池液态水自适应流场板" : CN202111178528.4. | 2021-10-10 . |
| APA | 郭航 , 牟禹辉 , 叶芳 . 平行流场与蛇形流场自动切换的燃料电池液态水自适应流场板 : CN202111178528.4. | 2021-10-10 . |
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