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Author: search.filters.author.Ali, A.A.Subject: search.filters.subject.CFD

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    EFFECT OF NOZZLE CONFIGURATION ON PERFORMANCE OF A SPRAY DRYER
    (University of Chemical Technology and Metallurgy, 2024) Ali, A.A.; Kumar, S.S.
    In this work, hydrodynamics and drying characteristics of spray dryer is numerically investigated using computational fluid dynamics (CFD) using Euler-Lagrangian (EL) approach. The gas phase is modelled as the continuous phase and solid particle as the dispersed phase. The turbulence in the gas phase is predicted using RNG version of k-ε model. As airflow pattern influences the time spent by particle in drying chamber, the spatial variation of air velocity and its circulation rate is quantified. Accordingly, optimum conditions for drying the feed slurry are determined. Further, five different outlet pipe locations are chosen and the optimum location is identified which supports the highest evaporation rate. To improve the product quality, conventional nozzle is modified and particle impact positions are analyzed. The particles impact positions on the dryer’s surface are found to be minimum for the proposed nozzle configuration and it improves the final product quality. © (2024), (University of Chemical Technology and Metallurgy). All Rights Reserved.
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    CFD MODELLING OF NON-ISOTHERMAL PROTON EXCHANGE MEMBRANE FUEL CELL (PEMFC): ROLE OF BAFFLES
    (University of Chemical Technology and Metallurgy, 2024) Ali, A.A.; Ganta, N.
    Through oxidation (H2 ) and reduction (O2 ) reactions, the chemical energy of the fuel is converted by proton exchange membrane fuel cell (PEMFC) into electricity and is therefore considered an energy converter. In this work, performance of a PEMFC is numerically investigated using computational fluid dynamics (CFD). To characterize the non-isothermal behavior of PEMFC, 3D transient CFD simulations are performed. The distribution of H2 and O2 mass fractions, temperature, and current density profiles are analyzed for various operational conditions. The optimum condition (voltage = 0.1 V; thickness of gas diffusion layer (GDL) = 0.0127mm; thickness of catalyst layer (CL) = 0.014mm) for an operation of PEMFC is identified Trapezoidal and rectangular baffles are proposed into the flow channels to enhance the performance of PEMFC. The rectangular baffle configuration supports maximum conversion of reactant gases (H2 = 24.16 %, O2 = 41.72 %) in comparison with the trapezoidal baffle. A significant increase in conversion is reported when the number of baffles in the gas flow channel is increases. Thus, PEMFC performance is enhanced with baffle configuration. © (2024), (University of Chemical Technology and Metallurgy). All Rights Reserved.