The Flow Analysis and Performance Design of Membraneless Fuel Cells
Date Issued
2005
Date
2005
Author(s)
Fang, Nai-Siang
DOI
zh-TW
Abstract
This thesis is to analyze and evaluate the phenomena of the internal transmission of novel membraneless fuel cells as well as the cell performance. Relevant simulations are accomplished by commercial software CFDRC, which solves governing equations through finite volume method. Internal flow field, concentration field, and current density under different operating and geometric parameters are simulated to clarify the effects of those parameters on cell performance. Conclusions could be helpful for the experiments.
Resulting from simulations, high Peclet number decreases the thickness of the concentration boundary layer, current density could be increased. In detail, cathode transmission dominates whole performance where anode one works a little. Therefore, increasing oxidant concentration and diffusion coefficient elevates the cell performance quite well. A larger kinematic viscosity of the fuel also augments oxidant’s Peclet number to improve the performance. Geometrically, when flow rate is fixed, shrunk cross section area of the channel provides better performance for enlarged Peclet number. Altering aspect ratio of the cross section area to bring down area and bring up Peclet number shall be improving the cell performance greatly.
Subjects
無膜
燃料電池
裴立數
Membraneless
Fuel Cells
Peclet Number
Type
thesis