Department of Mechanical engineering
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Item Computational Approaches in Industrial Centrifugal Pumps(Intechopen, 2022-09) Bhattacharyya, SuvanjanThe growing energy demand is expected to be met with increased oil and gas production. Hence, there is a need to design high-performance industrial centrifugal pumps. Recent improvements in CFD are considered as a valuable research tool to investigate the flow inside the pump and its influence on the performance of the centrifugal pump. The scope of the chapter is to emphasize the use of CFD and theoretical analysis for design and to show the prospect of improving the efficiency of a centrifugal pump. The chapter discusses the computational approaches to the CAD modeling and CFD simulation of the industrial centrifugal pumps, and the strategies and methodologies adopted. The chapter would be relevant and useful to both the pump designers, manufacturers, and industrial users.Item Numerical Analysis of Heat Transfer and Pressure Drop in a Square Channel with Novel Centre Hole Inclined Ribs(Springer, 2023-04) Bhattacharyya, SuvanjanIn present simulation analysis, heat transfer, pressure drop and thermal performance factor in a square channel equipped with inclined ribs with central hole is investigated. The study is conducted in turbulent flow regime with Reynolds number ranging from 10000 to 80000. The variable parameters are pitch ratio (y = p/D = 0.5, 1.0 and 1.5), hole ratio (h = d/D = 0.1 and 0.2) and rib angle (θ =30°, 45°, and 60°). ANSYS Fluent 19.0 is used for simulations and governing equation are solved using RANS turbulence model. It is revealed from the investigation that presence of inclined ribs enhance the heat transfer and pressure drop. For the case of inclined ribs with central hole, enhancement is further increased. For all the cases the thermal performance factor remains higher than unity.Item Computational heat transfer analysis of a counter-flow heat exchanger with fins(RDME, 2015) Bhattacharyya, SuvanjanA numerical work has been conducted to examine laminar flow and heat transfer characteristics in a two-dimensional isothermal-fluxed circular-duct fitted horizontal with finned tapes. The computations are based on the finite volume method with the SIMPLE algorithm implemented. This paper reports the Computational Fluid Dynamics (CFD) modelling studies on heat transfer, friction factor and thermal performance of a counter-flow heat exchanger equipped with two types of tube insert including fins. The principle of heat transfer enhancement in the core flow of tube has been proposed to improve the temperature uniformity and heat transfer enhancement in the boundary flow of tube. The studied the temperature profile and velocity profile was obtained by the fins inserts with an inclined angle of 90°. The results have also revealed that the difference between the heat transfer rates obtained from two models with fins and without fins. The CFD predicted results were used to explain the observed results in terms of swirl intensity.Item Computational investigation of heat transfer enhancement by alternating inclined ribs in tubular heat exchanger(Inder Science, 2017) Bhattacharyya, SuvanjanThis paper encapsulates results of a numerical investigation on flow and heat transfer of an incompressible medium with constant properties through an isothermal circular tube with alternating inclined ribs. Simulations are conducted for laminar, transitional, and turbulent flow regimes. As turbulence model, the transitional shear stress transport model is employed. The problem is investigated for four rib angle of attack values, as well as for a plain tube without any ribs. All configurations are observed to lead to a thermal performance factor close to or greater than unity. Within the investigated range, the larger thermal performance factors are observed to occur for the intermediate Reynolds numbers. Maximum values in the range 2.0-2.5 are predicted for the Reynolds number of 2,000, where a subsequent drop to values within the range 1.0-1.5 are found to occur for Reynolds numbers around 3,000-4,000, which may be attributed to the transitional effects.Item CPU heat sink cooling by triangular shape micro-pin-fin: Numerical study(Elsevier, 2018) Bhattacharyya, SuvanjanThe cooling capability of heat sinks is important for a central processing unit (CPU). In this work, simulation has been done to study heat transfer (HT) in a heat sink (HS) mounted on the triangular cylinder chip of a CPU is studied, to explore the thermofluid behaviour of the designed micro-pin-fin heat sink. Air cooling methods are used for heat extraction. This numerical work considers the effects of inlet turbulence intensity (TI) and fin diameter (D) of the micro-pin-fin on the performance of the heat sink. Turbulent SST model is applied to capture turbulence regime in the system. The heat transfer and pressure coefficient were obtained at different Reynolds number (Re) (i.e. different inlet velocities). As shown in this study, the Nusselt number (Nu) increases with increase in air flow velocity which enhance the heat extraction from CPU.