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Characteristics of gas-liquid two-ph...
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Yang, Hao.
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Characteristics of gas-liquid two-phase flow in the anode flow field of liquid feed direct methanol fuel cells.
紀錄類型:
書目-電子資源 : Monograph/item
正題名/作者:
Characteristics of gas-liquid two-phase flow in the anode flow field of liquid feed direct methanol fuel cells./
作者:
Yang, Hao.
面頁冊數:
158 p.
附註:
Source: Dissertation Abstracts International, Volume: 66-01, Section: B, page: 0518.
Contained By:
Dissertation Abstracts International66-01B.
標題:
Engineering, Mechanical. -
電子資源:
http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3159634
ISBN:
0496929054
Characteristics of gas-liquid two-phase flow in the anode flow field of liquid feed direct methanol fuel cells.
Yang, Hao.
Characteristics of gas-liquid two-phase flow in the anode flow field of liquid feed direct methanol fuel cells.
- 158 p.
Source: Dissertation Abstracts International, Volume: 66-01, Section: B, page: 0518.
Thesis (Ph.D.)--Hong Kong University of Science and Technology (People's Republic of China), 2005.
Direct methanol fuel cells (DMFC), using a solid polymer membrane as electrolyte and liquid methanol as fuel, have been projected as promising power sources for portable electronic devices, electric vehicles, and other applications, because this type of fuel cell offers the unique advantages of a lower system volume and weight, a simpler system design, a simpler mode of operation with fast response and better dynamics as well as lower investment and operating costs. The anode flow field is one of the key components of a DMFC, which not only provides channels for liquid methanol fuel to access to the reaction sites, but also allows the removal of gas CO2 generated during the electrochemical reaction of methanol oxidation. Therefore, a better understanding of liquid-gas two-phase flow behavior in the anode flow field is essential for the improvement of cell performance and for the optimal design of an entire DMFC system.
ISBN: 0496929054Subjects--Topical Terms:
783786
Engineering, Mechanical.
Characteristics of gas-liquid two-phase flow in the anode flow field of liquid feed direct methanol fuel cells.
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Direct methanol fuel cells (DMFC), using a solid polymer membrane as electrolyte and liquid methanol as fuel, have been projected as promising power sources for portable electronic devices, electric vehicles, and other applications, because this type of fuel cell offers the unique advantages of a lower system volume and weight, a simpler system design, a simpler mode of operation with fast response and better dynamics as well as lower investment and operating costs. The anode flow field is one of the key components of a DMFC, which not only provides channels for liquid methanol fuel to access to the reaction sites, but also allows the removal of gas CO2 generated during the electrochemical reaction of methanol oxidation. Therefore, a better understanding of liquid-gas two-phase flow behavior in the anode flow field is essential for the improvement of cell performance and for the optimal design of an entire DMFC system.
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This thesis presents a systematic investigation of the characteristics of liquid-gas two-phase flow in the anode flow field of a DMFC. It starts with reporting on an ex-situ study of two-phase flow behavior in an air-water flow system simulating the DMFC anode flow field, in which water was fed into the channel from its entrance, while air was injected uniformly into the channel from a permeable wall. The flow visualization shows that there existed some peculiar flow behavior in such a two-phase flow system, which was never encountered in conventional co-current gas-liquid two-phase flows. For instance, a so-called "single layer bubbly flow" was found in vertical upward flow, and four transitional flow patterns, namely bubbly-plug flow, bubbly-slug flow, plug-slug flow, and slug-annular flow, were found to exist between the distinct flow patterns. Furthermore, the flow regime maps for various liquid volumetric fluxes have been developed in terms of mass quality versus the volumetric flux of gas phase.
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An in-situ investigation of two-phase flow characteristics in the anode flow field of an in-house fabricated DMFC was then performed. The innovative design of the experimental setup facilitated a systematic study of various operation parameters, including current density, methanol solution concentration and flow rate, cell operating temperature and cell orientation that affect the CO2 gas bubble behavior, pressure drop, and the cell performance. (Abstract shortened by UMI.)
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