BITS Faculty Publications
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Item Recalibrating Science & Technology Education for Environmental Sustainability- Re-Orientation of Text Books(IIETA, 2017-11) Bhattacharyya, SuvanjanSustainability aims at keeping the future of civilisation and society alive. Science and Technology is a tool for this. India has a long tradition of science, education and now a vastly expanded technical education system. New Textbooks or Learning Materials-print or digital, are absolutely essential for this to fulfil particularly. SDG, as listed Globally or Nationally. India’s ranking comes low in PISA, which is an International Students’ Evaluation for applying science education to real life problems, for school leaving students. Sustainability is linked to reality. In Global Institutional Ranking also India’s ranking is not high for the Universities. One of reason is improper learning materials, leading to unsustainability mindset. This paper attempts to find the reasons the shortcomings. From experience, observation and study, the author has attempted to point out solutions in one major area, i.e., paradigm shifts required for text books on Science and Technology, particularly at middle school level and Technical Institutions. One of the major conclusion is that, it is important to change orientations of Indian books with clarity and lucidity, the sustainability concepts. Writing books by Indian teachers mostly and involving learned professors in writing texts will enhance the technical knowledge base of the students, increase their employability by clearing fundamental concepts and thus take India forward to a sustainable future as a whole. This will also enable inclusive education and will also enhance the ‘Make in India’ conceptual framework.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 Applications of Computational Fluid Dynamics Simulation and Modeling(Intechopen, 2022-06) Bhattacharyya, SuvanjanThis 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.Item Numerical simulation of Laminar flow heat transfer Enhancement in a three-dimensional Channel flow with Inclined ribs(Cyber Times International Journal of Technology & Management, 2014-09) Bhattacharyya, SuvanjanEffects of ribs on forced convection heat transfer and friction loss behaviors for laminar airflow through a constant heat flux channel are numerically investigated in the present work. Ribs are known to enhance the heat transfer between the energy-carrying fluid and the heat transfer surfaces. A numerical investigation on the laminar flow and heat transfer behavior in the circular channel with inclined ribs for three different. The computations based on the finite volume method with the SIMPLE algorithm have been carried out with Reynolds number ranging from 100 to 1000. The numerical results show that the heat transfer of the inclined ribbed channel are improved about 90-110% compared with smooth duct because co-rotating vortices are generated on the cross section of channel. In addition, the effects of geometric parameters for ribs on the heat transfer, such as rib height, rib pitch, were analyzed. The heat transfer, pressure loss and thermal performance of the inclined ribs with different attack angles (θ) of 0o, 10o, 15o, 20o, 25o, and 90oare examined.Item 3d computational study of fluid flow and heat transfer in a dimple enhancer channel(Begell House, 2017) Bhattacharyya, SuvanjanHeat transfer behaviour in dimple enhancer channel swirl generator is investigated numerically. Vortex generator geometry is a widely used procedure for heat transfer improvement. This work presents the investigation of a dimple enhancer channel for turbulent heat transfer with air (Pr 0.707) as the working fluid. 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 simulation are performed using three dimple ratio (r = d/D = 0.1, 0.15 and 0.2) and three different space ratios (s = y/D = 2.0, 2.5, and 3.0). The computations were conducted with Reynolds number ranging from 100 to 50,000. The results indicate that the large dimple ratio and small space ratio yields a higher heat transfer value with relatively lower performance penalty. The transition from laminar to turbulent regime is observed between Reynolds numbers of 2000 to 3500 for all cases. For all investigated cases the performance factor (η) are almost greater than unity. This result is useful for the design of solar thermal heaters.Item Transport enehancement in a channel with mutiple triangular prisms(ASTFE, 2018-03) Bhattacharyya, SuvanjanThermohydraulic performances in a square channel fitted with triangular prism, using air (Pr = 0.707) as working fluid are investigated numerically. The triangular prism is placed in a square channel. Influences of triangular prism arrangement in forward direction are described. The Reynolds number varies from 100 − 50,000. Air has been used as a working fluid. In this paper, transition - SST model which can predict the transition of flow regime from laminar through intermittent to turbulent has been applied for numerical simulations. Due to the formation of vortices, the heat transfer is enhanced appreciably. The results indicate that in presence of triangular prism, heat transfer in a channel is augmented by around 10% - 12%. The increase in heat transfer is related to the vortex formation downstream of the triangular element. Heat transfer enhancement and friction loss increased with combined effect of three triangular prisms. Numerical results indicate that the use of triangular prisms the channel can prominently increase the heat transfer performance.Item Heat Transfer and Fluid Flow behaviours of a Square Twisted Micro-Channel(IIT Bombay, 2018-12) Bhattacharyya, SuvanjanThe heat transfer and pressure drop analysis of twisted square micro-channel is studied numerically for Reynolds number (Re) ranging from 10 to 250. The laminar flow model is used for formulation in Ansys fluent 15.0, since the flow is laminar. The governing equations are solved with a finite-volume-based numerical method. A three-dimensional non uniform grid was generated, in order to critically examine the flow and heat transfer. The effects of aspect ratio and twist ratio on the Nusselt number and friction factor are investigated. It is found that the twisted geometry of the channel evidently enhance heat transfer by generating longitudinal vortices, which strengthen flow mixing. Such small vortices also upsurge the turbulent kinetic energy (TKE) and decrease thickness of the boundary layer, which lowers local temperature nearby the target surface. Computational results show that the simulation with twisted micro-channel geometry considerably better than the case with straight micro-channel with respect to heat transfer performance.Item Thermohydraulic characteristics of transitional flow in a circular tube with inlet disturbances(HEFAT 2019, 2019-07) Bhattacharyya, SuvanjanThe influence of a triangular prism at the inlet of a circular tube on the thermohydraulic characteristics in the laminar, transitional and turbulent flow regimes is investigated experimentally. The effects on transition, i.e. the transition shift, due to the presence of triangular prism for three different clearance ratios (CR) are studied in this present work. The tube had an inner diameter of 20 mm, and length of 3.5 m (heated portion). Air was used as the working fluid. The test were conducted at two different heat fluxes of 2 and 4 kW/m2 for Reynolds numbers between 1 000 and 6 500, to ensure that all the three flow regimes were covered. The position of the triangular prism is at a distance (x) of 1.85 m from the inlet plane. The length of the pipe is 5.5 m, after 2 m from the inlet plane the pipe is heated with constant heat flux. The results show a good agreement with the available correlations. The effect on transition behavior due to the presence of triangular prism is reported in terms of Nusselt number, friction factor, j-factor and thermal performance factor (η). However, the heat transfer coefficient for this arrangement is showing more promising result as compared with the plain tube.Item Simulation of two-phase nanofluid flow and heat transfer in a 3D diamond shape cavity equipped with square shaped obstacle and decreasing dimensions(Authero, 2020-03) Bhattacharyya, SuvanjanThe present study investigates numerically symmetry simulation of two-phase nanofluid flow and heat transfer in a 3D diamond shape cavity equipped with square-shaped obstacle and decreasing dimensions. The studied material in the present study is assumed with two different emissivity values, ԑ = 0.3 and ԑ = 0.9, due to analyze the effects of emissivity values on radiation heat transfer. Also two different Rayleigh numbers, Ra=106 and 108. The heat transfer fluid is water-based Cu nanofluid which makes a Newtonian nanofluid, but other base fluid is also analyzed. The main aim of present work is to simulate the 3D diamond shape cavity equipped with square-shaped obstacle and decreasing dimensions geometry using symmetry method and also investigate the effects of different Rayleigh numbers, emissivity values and different nanoparticles volume concentrations on thermal and hydraulic characteristics of the model. Base on obtained results, by an increase of nanoparticles volume concentration the temperature gradients and heat transfer characteristics are improved but the streamlines have not a significant change and by an increase of nanoparticles volume concentration the temperature gradients and heat transfer characteristics are improved, but the streamlines have not a significant change. According to results at higher Rayleigh numbers, the heat transfer characteristics are enhanced. Also, it is found that higher Rayleigh numbers and nanoparticles volume concentrations lead to more heat transfer inside the cavity and changes in emissivity coefficients have not a significant effect on heat transfer characteristics and nanofluid flow in the cavity.Item Experimental and Numerical Investigation of the Heat Transfer Characteristics of Laminar Flow in a Vertical Circular Tube at Low Reynolds Numbers(Springer, 2021-06) Bhattacharyya, SuvanjanLaminar flow is very common in practical situations and vertical tubes are used for many industrial applications ranging from cooling of thermal systems such as compact heat exchangers, solar energy collectors, boilers, and nuclear reactor.