• Prof. Majid Ghassemi
  • Prof. Majid Ghassemi
  • Mechanical Engineering, K.N. Toosi University, Iran
  • Title: Micro Tubular Single Chamber Solid Oxide Fuel Cell (MT-SC-SOFC)
  • Abstract:

    Single-chamber solid oxide fuel cell (SC-SOFC) operates on premixed fuel and oxidant gaseous mixture diluted by a balance gas such as nitrogen in order to keep the mixture safe. The main difference between SC-SOFC and SOFC lies in number of channels. In SC-SOFCs, as a PEN (Positive electrode-Electrolyte-Negative electrode) is located in a single-chamber containing premixed mixture flow, anode and cathode electrodes are exposed to flow of fuel and oxidant mixture. So, separation between fuel and oxidant is not necessary and sealing between cell components is vanished. But in SOFCs, since anode and cathode electrodes are exposed to fuel and oxidant respectively, fuel and oxidant separation is vital. Choosing a good sealant material for SOFC that ensures long-term stability in high ranges of performance temperature (750-1000oC) is a challengeable topic yet. In this case, elimination of gas-tight sealing in SC-SOFC components is one of the advantages of SC-SOFC that causes many researchers considerations are attracted to it.

    On the other hands, all the reported electrical efficiencies of SC-SOFC are below 5% which is quite low. For this reason, most research works in the area of SC-SOFC are done in order to increase this low efficiency. Most studies are limited to experiments and just a few numbers of numerical studies have been done. Recently, many useful numerical models of SC-SOFC have been developed by Akhtar (graduated from University of Birmingham, UK) et al. They successfully developed a two dimensional, axisymmetric numerical model of a micro-tubular single-chamber solid oxide fuel cell (MT-SC-SOFC) on steady state conditions. They validated their results with the experimental data obtained in their previous study. Their results show that the model is able to predict the experimental trends and is reliable for optimization of the experimental setup model. The lacking point of their model and also all the other numerical models developed in the area of a SC-SOFC up to now is to be unable to model dynamic behavior of a MT-SC-SOFC. Employing modeling to understand the dynamic behavior of the cell is necessary because it is vital to maintain mechanical stability of the cell during any proposed operation hence it is essential to track the changes in temperature with time at any location inside the cell. Helping to understand the transient physical phenomena inside the fuel cell, modeling becomes an important tool to predict the response of fuel cell parameters to any load change and then can be used to suggest a control scheme for the fuel cell operation. Modeling can also be utilized to identify the fuel cell behavior at some critical conditions such as failures in system components.

    Consequently, we want to develop Akhtar’s model which can investigate the current density response of the MT-SC-SOFC as a result of step changes in voltage. Time scales associated with mass transfer and heat transfer are distinguished in our analysis while discussing the effect of each phenomenon on the overall dynamic response. Prediction of dynamic behavior of MT-SC-SOFC as a result of failure in fuel and oxidant mixture supply is also our purpose. In addition, we want to investigate the time duration until the external current drops to zero. For this purpose, preparation the experimental setup in order to calibrate our results can be very useful. It has to be mentioned that we would like to use COMSOL Multiphysics for this work.

  • Biography: Majid Ghassemi is a Professor of Mechanical Engineering Department at K. N. Toosi University of Technology; one of the most prestige’s technical university in Tehran, Iran. He is currently teaches graduate and under graduate courses and conduct research in area of heat transfer and its application in drug delivery, fuel cell and alternative energy. He also serves as a board member for the University of Kashan.
    He has over 20 years of academic and industrial experience and served as Chancellor of K. N. Toosi University from 2010 through 2013. Dr Ghassemi has also served in several public and private board and panels and supervised several undergraduate, masters and PhD students, published several books and many journal and conference papers.
    Dr. Ghassemi is currently an Editor-in-Chief of International Journal of Prevention and Treatment and Managing Editor of American Journal of Mechanical Engineering(AJME). He is also an Editorial Board member for many international journals. He received his Ph.D. in Mechanical Engineering from Iowa State University in 1993.
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