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Author: search.filters.author.Ali, B.A.

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    Effect of baffle configuration on performance of batch stirred vessel
    (Springer, 2022) Ali, B.A.; Falleiro, L.H.
    Crystallization is often carried out in batch stirred vessels. However, it is difficult to obtain uniform crystal size distribution (CSD), as it strongly depends on prevailing flow field operating conditions. This is adversely affected by the geometry of stirred vessels. Hence in this work, CFD simulations were performed to investigate flow field, mixing and crystallization phenomena in a stirred vessel. The performance of the stirred vessel was compared with draft tube baffled stirred vessel. The flow field was quantified through liquid circulation and vorticity. The mixing was analyzed through macromixing time in the stirred vessel. The solubility data, nucleation, and growth kinetics were integrated with CFD through a user-defined function (UDF) to predict crystallization phenomena. The predicted results were validated with experimental data available in the literature. The effects of seed mass, size and temperature on CSD were investigated and optimum conditions [750 gm (seed mass); 500 µm (seed size); 308 K (temperature)] for favourable crystal growth were identified. The performance of the proposed baffled stirred vessel was found to be significant, and it supports enhancing flow field, mixing and crystallization process. © 2022, The Korean Institute of Chemical Engineers.
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    EFFECT OF INDENTATIONS ON THE PERFORMANCE OF PEM FUEL CELL
    (University of Chemical Technology and Metallurgy, 2023) Ali, B.A.; Roy, A.K.
    Proton Exchange Membrane Fuel Cell (PEMFC) is an electrochemical device that converts H2 and O2 to electricity. The performance of a fuel cell is influenced by the flow field of gas reactants and product distribution. In this work, the performance of a single channel PEMFC is numerically investigated through Computational Fluid Dynamics (CFD). The performance of a fuel cell is investigated for a wide range of operating conditions such as operating voltage, temperature, relative humidity, and geometric parameters such as membrane thickness. The predicted polarization, power density, contours of temperature, and fuel utilization are analysed to identify an optimum condition for the operation of PEMFC. To improve the performance of PEMFC, indentations (rectangular and shark fin) are proposed in the flow channel. This supports significantly enhancing the performance of PEMFC without using any conventional H2 recirculation system. © 2023, Journal of Chemical Technology and Metallurgy. All Rights Reserved.