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Author: search.filters.author.Punbusayakul, N.

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    Assessment on hermetic property and mechanical compatibility of various groove-gasket sealing designs for solid oxide fuel cell stack
    (2012-09-01)
    Punbusayakul, N.
    ;
    Boonsiri, K.
    ;
    Charojrochkul, S.
    ;
    Fungtammasan, B.
    ;
    Charoensuk, J.
    Assessment among various groove-gasket designs under solid oxide fuel cell operating condition is presented. The gasket is deformable under the stress applied by external loading between 0.13-0.67 MPa. The operating temperature is from 30 to 800 °C. It has an indicated width of 1.95 mm and depth of 2.1 mm., which is accommodated in a square, triangular and U groove channel having the dimension of 2.0 × 2.0 mm <sup>2</sup>. From the results, the U shape configuration provides the best performance with immeasurable leak rate under the applying load represented in term of global stress of 0.67 MPa. A stress analysis using Finite Element Method (FEM) tool, ABAQUS™, suggests sufficiently high compressive stress far exceeding the elastic limit with enough coverage of such high-stress area for U-shape design. In contrast, those from square and triangular designs posses relatively lower well-distributed stress and smaller region of highly concentrated stress, respectively. The associated deformed cross section suggests that the gasket has plastically deformed toward the U-shape wall surface at a greater degree than those for triangular-shape design. It can be concluded that the greater region in deformed gasket surface can more effectively reduce interconnectivity of micro channel on the interface between the gasket and the interconnector surfaces. © 2012 Elsevier B.V. All rights reserved.
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    Behaviour of various glass seal for planar solid oxide fuel cell
    (2008-01-01)
    Punbusayakul, N.
    ;
    Wongklang, W.
    ;
    Wongtida, K.
    ;
    Charoensuk, J.
    ;
    Charojrochkul, S.
    One of the critical issues in designing a planar solid oxide fuel cell (SOFC) is the development of materials to hermetically seal the metal (430 series stainless steel) or ceramic interconnector with the ceramic electrolyte of the cell. The main objective of this sealing material is to achieve a low leak rate, long-term stability at operating temperature and chemical compatibility with other components. One of the compositions has been operated in an SOFC in excess of 30 minutes over the range of 600, 700, 800, and 900°C. The seal is a composition of polymer blend and glass of 1:3, 1:1 and 3:1 by weight. The leakage rate of each seal was measured simultaneously under the compressive force of 100 N, 2 bar Helium. The seal was characterized using a thermogravimetric analysis. The effect of glass composition on operating temperature and compressive forces on the leakage rate have been discussed and correlated. © 2008 Trans Tech Publications, Switzerland.
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    Modified sulfation model for simulation of pulverized coal combustion
    (2006-02-01)
    Punbusayakul, N.
    ;
    Charoensuk, J.
    ;
    Fungtammasan, B.
    This work deals with the development of mathematical techniques for incorporating existing sulfation models into a CFD code for simulation of the flow and heat and mass transfer in multi-phase reacting flow; i.e. in the combustion of pulverized coal with the dry type sulfur absorption process. By compromising the ability to maintain some features of the sulfation, as suggested in literatures with computation time, the model was successfully embedded into FAFNIR, a CFD code by Lockwood et al. and has been used for prediction of SO<inf>2</inf> absorption in pulverized coal combustion to compare with experimental data at various conditions. This paper focuses on mathematical representation of the sulfation process by including the effects of temperature on the reaction rate at zero sulfation and during increased sulfate loading or accumulation of product layers. The model is relatively simple and is applicable over a wide range of temperatures, particle sizes and SO <inf>2</inf> concentrations. Validation was performed and it was found that the model satisfactorily represents the amount of accumulated sulfate within the entire domain of calculation. © 2005 Elsevier Ltd. All rights reserved.