Browsing by Author "Madav, M."

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    CFD investigation of unsteady three-dimensional savonius hydrokinetic turbine in irrigation channel with varying positions for hydro power application
    (American Institute of Physics Inc., 2021) Shashikumar, S.; Hindasageri, V.; Madav, M.
    Savonius turbines are a drag driven device, and it has high starting torque. It is a vertical axis turbine and installed in small irrigation channels to utilize the hydrokinetic energy available. Since the density of water is more and the flow of water in the channel is constrained to one direction is the advantage for a vertical axis turbine as it reduces the yaw control mechanism. In the present work, a three-dimensional conventional Savonius turbine modeled and meshed in ANSYS Fluent and unsteady transient simulations are carried out using a sliding mesh technique. The computational simulations were carried out at three different positions to analyze the effect of placing a turbine blade in the high depth of water using a conventional Savonius turbine blade with an aspect ratio of 0.7 and 0.0 overlap ratio. The turbulence model used for CFD simulation is the k-ω SST model, and the results found that the maximum coefficient of torque and coefficient of power of 0.22 and 0.17 at a tip speed ratio of 0.7 and 0.9 respectively. © 2021 Author(s).
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    Use of Microalgae for the Development of Carbon Neutral Bio-CNG Process
    (Springer Science and Business Media Deutschland GmbH, 2024) Datta, P.; Bej, S.; Madav, M.; Raval, K.
    The comprehensive chapter focuses on the upgradation techniques and conversion of the biogas generated from the huge amount of biowaste, to methane-enriched bio-compressed natural gas (bio-CNG). The sustainable bio-fixation of the extracted CO2 by employing various algal strains for carbon capture and utilization (CCU) along with the culture conditions has been discussed. The comparative analyses highlight that the integrated biorefinery approach does not involve harmful chemicals, high energy utilization and high operating expenses. The post-treatment and consumption of biogas-separated CO2 by algae make the process carbon neutral. The potential algal strains, their CO2 utilization capacity, and subsequent formation of high algal biomass along with several significant value-added products such as biofuels, biochemicals and biofertilizers in different types of photobioreactors and other process parameters, are also elaborated. The emerging role of efficient algal species in reducing greenhouse gas emissions and addressing the climate change issue has been illustrated for making it an eco-friendly strategy. The systematic valorization of algal biomass contributes to promising resource regeneration and promotes a circular economy in the sector of bioenergy industries to sustainably fulfill the global energy demand. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2024.