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Author: search.filters.author.Bhattacharyya, SuvanjanSubject: search.filters.subject.Computational Fluid Dynamics (CFD)

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    Applications of Computational Fluid Dynamics Simulation and Modeling
    (Intechopen, 2022-06) Bhattacharyya, Suvanjan
    This book provides well-balanced coverage of computational fluid dynamics analysis for thermal and flow characteristics of various thermal and flow systems. It presents the latest research work to provide insight into modern thermal engineering applications. It also discusses enhanced heat transfer and flow characteristics.
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    A novel design for solar collector used for water heating application having nanofluid as working medium: CFD modeling and simulation
    (Springer, 2022-08) Bhattacharyya, Suvanjan
    A solar collector is a simple and cheap device that converts solar radiation into valuable heat energy. The thermal performance of the solar collectors can be enhanced significantly with the suspension of nanoparticles in the base fluid. A novel design for a solar-assisted water heater (SWH) is proposed in the current study, and the effect of nanofluid has been investigated on the thermal efficiency of the SWH. The use of nanofluid is one of the prominent methods in comparison to other techniques for improving the performance of solar collectors. Therefore, the base working fluid, i.e., water is mixed with the alumina nanoparticles of average particle size of 30 nm, and they are assumed to be spherical. The flow and thermal characteristics of nanofluid through the solar water heater are simulated numerically with the help of the Eulerian–Eulerian two-phase model using the finite volume method (FVM). The commercial package ANSYS Fluent, is used for modeling the problem under transient conditions with a pressure-based solver. In comparison to a conventional flat plate collector, the proposed solar water heater consists of a corrugated absorber-plate and the effect of the radius of curvature has been investigated on the heat transfer and collector efficiency. With the proposed design, the heat transfer area available with the riser tubes increases remarkably and it leads to a 43% and 14% increase in heat transfer augmentation and collector efficiency, in comparison to the conventional solar water heater.
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    Introductory Chapter: A Brief History of and Introduction to Computational Fluid Dynamics
    (Intechopen, 2021-08) Bhattacharyya, Suvanjan
    Computational Fluid Dynamics (CFD) refers to a broad set of methods that are used to solve the coupled nonlinear equations that govern fluid motion. To our best knowledge, the first attempt to calculate fluid flow was set forth by Lewis Fry Richardson, with applications for weather prediction. He envisioned a “forecast factory” that included 64,000 human “computers”. Each “computer” was positioned at tiered elevations around a spherical globe, occupying computational cells that corresponded to map locations, as shown below for northern Europe. His method involved inputting weather observation data to the corresponding grid locations and then solving the forward-stepping equations. Based on Richardson’s description, the following image provides the imagined weather prediction system, commonly referred to as the “fantastic weather factory” of Lewis Richardson. Each of the red and white grid cells represents a human calculator. They are arranged across the surface of a sphere (which represents the Earth). In the center, a conductor uses spotlights to highlight calculated results at each grid cell. It was acknowledged that for such a system to work, each human calculator would be required to perform their calculations at the same speed. That is, if one human calculator was either faster or slower than its neighbors, it would send information to the neighbors at a faster or slower rate which would consequently cause numerical instability; a concept that is important even today as we will show. In the image, the blue spotlight identifies calculators that are operating too slowly, and the red spotlight identifies those that are too fast.
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    Computational of studies of heat transfer enhancement in turbulent channel flow with twisted strip inserts
    (Begell House, 2015) Bhattacharyya, Suvanjan
    Heat transfer behaviour in twisted strips swirl generator inserted tube are investigated numerically. This work presents the configuration optimization of a typical single-twist twisted strip in a circular tube for turbulent heat transfer in air using computational fluid dynamics (CFD) modelling. In the present paper, transition - SST model which can predict the change of flow regime from laminar through intermittent to turbulent has been used for numerical simulations. The twisted strips are inserted separately from the tube wall. The configuration parameters include the, entrance angle (α) and pitch (H). The computational results are in good agreement with experimental data. The results indicate that the larger rotated angle yields a higher heat transfer value and a greater flow resistance of Reynolds number. The optimal design of typical twisted strips in a circular tube for turbulent air flow is, α = 180°, 160° and 140° with a Reynolds number that varies from 100 to 20000. The using of single twist twisted strips supplies considerable increase on heat transfer and pressure drop when compared with the literature. The Nusselt number increases with the increase of Reynolds number. This result is useful for the design of solar thermal heaters and heat exchangers.