Theses and Dissertations

Bikash Mishra

Issuing Body

Mississippi State University

Advisor

Wu, Junxiao

Committee Member

Marcum, David

Committee Member

Luke, Ed

Committee Member

Janus, Mark

Committee Member

Shivaji, Ratnasingham

Date of Degree

12-13-2008

Document Type

Dissertation - Open Access

Major

Computational Engineering (program)

Degree Name

Doctor of Philosophy (Ph.D)

College

James Worth Bagley College of Engineering

Department

Computational Engineering Program

Abstract

Fuel cells are promising technology to meet the energy need of the future. This alternative energy source is clean and efficient, and with the continuous decrease in fossil fuel resources, one of the best bets towards sustaining our power needs. Fuel cells are being used in automobiles as well as to fulfill portable power needs. In this work a computational model has been developed for fuel cells which can be used to simulate traditional as well as passive proton exchange membrane fuel cell behavior. The model is unsteady, two phase, nonisothermal in nature, and also capable of handling natural convection or buoyancy driven flows. The model also takes into account electrochemical reactions at catalyst sites. The model has been implemented and validated against experiments. It is used to carry out unsteady simulations to study start-up characteristic of proton exchange membrane fuel cells and to follow the behavior of liquid water as well as heat transfer within the cell. The buoyancy model is used to simulate a natural convection region and a passive fuel cell (used for portable applications). Design of passive fuel cells is driven by high temperature regimes and that issue has been further explored.

URI

https://hdl.handle.net/11668/15560

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