摘要
对一种新型钒微流体燃料电池进行了理论分析并建立了三维数值模型。该模型包含了层流、物质传输与电化学反应等电池内部的物理和化学过程。计算得到的极化曲线与实验数据吻合较好,说明模型是可靠的。通过多场耦合求解,数值模拟了体积流速、燃料纯度等对电池性能的影响。研究结果表明:增大体积流速可以提高电池的功率,但燃料利用率会大幅降低;燃料纯度对燃料电池的电压有较大影响;燃料利用率低是制约微流体燃料电池发展的主要因素之一。通过改进原有Y形流道设计,设计了一种双Y形流道微流体电池,仿真结果显示其可以较大地改善燃料的利用率。
In this study, a theoretical analysis for a novel microfluidic vanadium fuel cell was implemented, which relies on laminar flow at low Reynolds number to maintain sufficient separation of fuel and oxidant streams. A three-dimensional numerical model that accounts for laminar flow, transport process of species and electrochemical reactions in fuel cell, was developed to evaluate the effect of some important physical factors including volumetric flow rate and fuel purity. All coupled equations in the model were solved digitally together. The simulation results showed that output power and current density went up with the increase of flow rate, however, the fuel utilization went down significantly. As the volumetric flow rate increased from 1 /al ~ s-lto 25 ~1 ~ s ~, the power density increased by 2.2 times and there was a 90% drop in fuel utilization. Further microfluidic fuel cell design and optimizations were guided by using the model, a double Y-shaped microchannel design is proposed. It is found that the fuel utilization can be improved significantly by using a double Y-shaped microchannel.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2011年第12期3478-3483,共6页
CIESC Journal
基金
吉林省自然科学基金项目(20100564)~~
关键词
微流体燃料电池
数值模型
层流
燃料利用率
钒
microfluidic fuel cell
numerical modeling
laminar flow
fuel utilization
vanadium
