微流体燃料电池微通道内的单相流传递特性及性能

李汶壕，刘文俊*，刘姝靓

广西大学机械工程学院，广西 南宁  530004

摘要：为提升具有平面阳极的空气自呼吸微流体燃料电池的性能和研究微通道内单相流的传递特性，基于COMSOL Multiphysics软件对微流体燃料电池进行流体动力学分析，建立单相流动的微流体燃料电池的二维模型，仿真分析不同反应物体积流量、燃料浓度下电池的输出性能和燃料效率。结果表明：提高反应物流量和浓度可有效提高功率密度和电流密度，但燃料利用率和效率呈下降趋势；电池实际应用时应兼顾功率输出和燃料利用率。该研究可为微流体燃料电池的反应物流动传递优化和多角度性能提升提供参考。

关键词：平面阳极；微流体燃料电池；单相流；燃料利用率；效率；功率密度

Single-phase flow transfer characteristics and performance in the microchannel of microfluidic fuel cell

LI Wenhao, LIU Wenjun*, LIU Shuliang

School of Mechanical Engineering, Guangxi University, Nanning 530004, China

Abstract：In order to improve the performance of air-breathing microfluidic fuel cell with flow-over anode and explore the transfer characteristics of single-phase flow in the microchannel, the hydrodynamic analysis of microfluidic fuel cell is carried out based on COMSOL Multiphysics software, and a two-dimensional model of single-phase flow microfluidic fuel cell is developed. The output performance and fuel efficiency under different reactant flow and fuel concentration are analyzed by numerical simulation. The results show that the power density and current density can be effectively increased by increasing the flow rate and concentration of reactants. However, the fuel utilization rate and exergy efficiency show a downward trend. The conclusion is that, when considering the practical application of fuel cell, it is necessary to balance power output and fuel utilization. This study can provide a reference for the optimization of dynamic transfer of reactants and the advancement of multi-angle performance of microfluidic fuel cells.

Keywords:flow-over anode; microfluidic fuel cell; single-phase flow; fuel utilization rate；energy efficiency;power density