Browsing by Author "Bhattacharyya, Suvanjan"

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3D CFD Simulation of Heat Transfer and Friction Characteristics of Laminar Flow of Water through a Circular Duct with Centre-Cleared Twin Twisted Tape
(IJATR, 2015-12) Bhattacharyya, Suvanjan
Heat transfer behavior of laminar flow inside circular duct with centre-cleared twin twisted tape (CTTT) swirl generator was investigated numerically. The governing equations were 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 centre-cleared twin twisted tapes were tested in the current work; investigations were performed in the Reynolds number range of 100- 1,000 with four different CTTTs at twist ratio (TR) of H/W = 1.0, 2.0, 3.0 and 4.0. Water is used as working fluid (Pr = 7). The effects of Reynolds number, Nusselt number, friction factor, convective heat transfer coefficient were examined and discussed. The use of CTTT was found to increase the heat transfer considerably when compared with plain tube. The Nusselt number increased with the increase of Reynolds number. The overall enhancement ratio has been calculated in order to discuss the overall effect of CTTT and the working parameters. The present findings would be useful inputs for the design of solar thermal heaters and heat exchangers.
3d computational study of fluid flow and heat transfer in a dimple enhancer channel
(Begell House, 2017) Bhattacharyya, Suvanjan
Heat 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.
48th national conference on fluid mechanics and fluid power
(Springer, 2023-01) Bhattacharyya, Suvanjan
This Special Issue of Journal of Thermal Analysis and Calorimetry contains a selection of research articles related to the contributions presented at the 48th National Conference on Fluid Mechanics and Fluid Power (FMFP 2021) which took place at Birla Institute of Technology and Science, Pilani, Pilani Campus, Rajasthan, India, between December 27 and 29, 2021. The conference gathers experts from the field of fluid mechanics and thermal sciences to present their work annually. We are thankful of National Society of Fluid Mechanics and Fluid Power (NSFMFP) and Birla Institute of Technology and Science Pilani to believe in us and help in successful completion of the event. We warmly acknowledge all the collaborators who participated in the event and presented their work.
Analysis and Design for Hydraulic Pipeline Carrying Capsule Train
(ASCE, 2021) Bhattacharyya, Suvanjan
The hydraulic capsule pipeline (HCP) is regarded as the third-generation pipeline, first and second generation being fluid andslurry pipelines, respectively. For increasing the performance of these pipelines, capsule numbers in the pipeline must be increased, therebyincreasing solid throughput. In the present study, computational fluid dynamics (CFD) modeling of a three-dimensional (3D) concentriccapsule train was carried out. The focus of this work was to study the effects of intercapsule spacing (S), diameter ratio (k), and aspectratio (a) on the performance of the pipeline in amount of energy consumption. Results show that fork¼0.8,a¼1.25, andS¼0.75timesof capsule length, the capsule train requires minimum power to move ahead. A detailed optimal cost analysis was also carried out, whichrevealed that total cost of the pipeline is first reduced then increased with the enlargement in pipeline diameter. Hence, optimizingthe diameter of a hydraulic pipeline transporting capsule was the subject of this study
Analysis of Effect of Exponential and Linear Heat Source on the Mixed Convective Flow in a Vertical Porous Microchannel with First Order Chemical Reaction
(Springer, 2023-03) Bhattacharyya, Suvanjan
An investigation is made to study the mixed convection of fluid through a microchannel which is filled with porous medium and influenced by uniform magnetic field. The impact of linear and exponential heat source on the microchannel is taken into consideration. First order chemical reaction is influencing the flow. The governing equations are tackled using Lobatto III formula which is a code written using the numerical method named as Finite difference method. The obtained results are analyzed using the graphs and tables. The study highlights that temperature- velocity profiles shows the enhanced nature with increment in mixed convection, which is influenced by the buoyancy force.
Analysis of heat transfer around bluff bodies with variable inlet turbulent intensity: A numerical simulation
(Elsevier, 2020-10) Bhattacharyya, Suvanjan
In the present study, a numerical simulation is carried out to analyze the effect of turbulent intensity on the flow behavior of flow past two dimensional bluff bodies. Triangular prism, diamond and trapezoidal shaped bodies with the same hydraulic diameter D, a dimensionless length scale are taken into consideration as bluff bodies. The objective of the numerical analysis is to cover cross flow at both turbulent and laminar regime with varying Reynolds number upto 200,000 and inlet intensities ranging between 5% and 40%. The flow medium used is air at a constant Prandtl number. The energy, momentum and continuity equations are dealt with transition SST Model for closure of turbulence. The results obtained through numerical simulation are validated with other published results by researchers and show good agreements. This present study reveals that transition SST Model can be efficiently used to cover both laminar and turbulent flow regimes to estimate the heat transfer. The impact of inlet turbulent intensity on augmentation of heat transfer using bluff bodies has been evaluated. It is observed from the study that the turbulent intensity significantly affects drag coefficient.
Application of New Artificial Neural Network to Predict Heat Transfer and Thermal Performance of a Solar Air-Heater Tube
(MDPI, 2021-07) Bhattacharyya, Suvanjan
In the present study, the heat transfer and thermal performance of a helical corrugation with perforated circular disc solar air-heater tubes are predicted using a machine learning regression technique. This paper describes a statistical analysis of heat transfer by developing an artificial neural network-based machine learning model. The effects of variation in the corrugation angle (θ), perforation ratio (k), corrugation pitch ratio (y), perforated disc pitch ratio (s), and Reynolds number have been analyzed. An artificial neural network model is used for regression analysis to predict the heat transfer in terms of Nusselt number and thermohydraulic efficiency, and the results showed high prediction accuracies. The artificial neural network model is robust and precise, and can be used by thermal system design engineers for predicting output variables. Two different models are trained based on the features of experimental data, which provide an estimation of experimental output based on user-defined input parameters. The models are evaluated to have an accuracy of 97.00% on unknown test data. These models will help the researchers working in heat transfer enhancement-based experiments to understand and predict the output. As a result, the time and cost of the experiments will reduce
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.
Applications of Heat Transfer Enhancement Techniques: A State-of-the-Art Review
(Intechopen, 2020-06) Bhattacharyya, Suvanjan
The fundamentals of heat transfer and its applications, the classification of heat transfer technology and different heat transfer techniques, and the needs for augmentation and its benefits and the different combinations of two or more inserts and integral roughness elements for heat transfer augmentation purpose have been introduced and discussed in this chapter. It is shown that most of the compound techniques performed better than the individual inserts for heat transfer enhancement. This chapter has also been dedicated to understanding the basic concepts of vortex generators for heat transfer enhancement in plate-fin heat exchangers. The performance of transverse, longitudinal, and wing-type vortex generators has been discussed as well.
Assessment of thermal loading in energy-efficient buildings: parametric review on the window design aspects
(Springer, 2022-12) Bhattacharyya, Suvanjan
Today, the main challenge to world energy policies is to complete the energy demands of society more sustainably without polluting the environment. The application of renewable energy sources is an alternative solution, but they are less efficient compared to conventional sources. The efficient utilization of energy ensuring the minimum losses from the system is an effective way. In this context, properly designed buildings can contribute in minimizing the overall energy demands of society. Generally, window systems are considered a critical part of a building with significantly poor thermal performance. Those must be designed carefully for the building to be energy efficient. The present work takes an opportunity to review several design parameters (window) affecting the annual energy consumption statistics (in terms of cooling and heating loads) for the buildings.
Augmentation of heat transfer in a microtube and a wavy microchannel using hybrid nanofluid: A numerical investigation
(Wiley, 2020-10) Bhattacharyya, Suvanjan
The paper discusses the numerical investigation involving forced convective heat transfer (HT) in the laminar flow regime is carried out for nanofluid (NF) and hybrid NF (HNF) in a microtube and wavy microchannel. Water-based Al2O3 NF and water-based Al2O3-Ag HNF is studied for this purpose. Reynolds number (Re), temperature, volume fraction, and nanoparticle (NP) size are varied for the analysis at a constant HT rate. Numerical results characterizing the performances of NF and HNF are presented in terms of the local HT coefficient. It is found that with the increase in Reynolds number, volume fraction, and temperature, local HT coefficient is increased. For Reynolds number of 50 and 𝜑 = 3%, a maximum of 11.03% increase in HT coefficient is obtained for microtube, while for the same case, a maximum of 10.16% is found for wavy microchannel. Comparison of NF and HNF reveals superior HT property of the later. However, microtube exhibits better HT coefficient than the wavy channel at constant heat flux, length, and area.
Augmented thermal performance in a non-uniform heat flux circular tube with twisted tape insert using hybrid nanofluid
(EDP Sciences, 2021-11) Bhattacharyya, Suvanjan
The influence of non-uniform heat transfer on a circular tube with a twisted tape insert using nanofluid (NF) is examined. The circular tube had an inner diameter 20 mm, with 0.5 mm thickness and 2 m of length. Wall heat flux conditions were examined for Reynolds number ranging from 5 000 to 25 000. Heat flux distribution included partial heating at different circumferential positions. Water was used as a base fluid, while single and multi-nano particles are used for simple and hybrid nanofluids (HNF). The goal of this study is to augment the thermal performance by incorporating non-uniform heating, using a twisted tape insert and by using nanoparticle of different volume fraction. NF act as a fluid additive and twisted tape act as a turbulence promoter and they enhance the heat transfer rate. However, major disadvantage in this investigation is the pressure drop incurred due to the twisted tape and NFs. Hence, a series of simulation are carried out to find out the optimum configuration of the set-up for which heat transfer will be enhanced with minimum pressure drop.
Axially Oriented Structured Porous Layers for Heat Transfer Enhancement in a Solar Receiver Tube
(Springer, 2021-08) Bhattacharyya, Suvanjan
The present work reports a numerical investigation of heat transfer and pressure drop characteristics in a solar receiver tube with different shaped porous media for laminar and low Reynolds number turbulent flow regimes. Numerical simulations have been performed with finite volume-based code ANSYS (v-2017) for different shapes of porous layers axially oriented in the tube. The plain-shaped porous medium fitted up to 50% of the tube shows better performance than other-shaped porous layers. Simulations have also been performed for axially oriented structured porous media with different sizes. Axially oriented structured porous medium develops a lateral flow disturbance enhancing the intermixing of the liquid and porous medium at their interface. Structured porous medium with a 3-crest configuration shows the best heat transfer performance among all the shapes of porous media. It offers a maximum of 148% heat transfer enhancement compared to a half-filled plain porous layer, whereas it reports a maximum of 564% enhancement compared to the flow without a porous layer. The lateral flow tendency or the swirling effect helps better heat transfer performance in the axially oriented structured porous media. Performance evaluation criterion (PEC) in all types of porous media is more in the transitional flow regime than in the laminar and turbulent flow regimes. For the same operating conditions, the maximum value of the PEC in the present work is 120% higher than the maximum value of PEC for other-shaped porous media reported in the literature. Correlations for Nusselt number have been developed for both laminar and turbulent flow regimes for three crests shaped porous medium.
CFD and experimental analysis of phase change material behaviour encapsulated in internally finned spherical capsule
(EDP Sciences, 2019) Bhattacharyya, Suvanjan
Phase change material (PCM) based Thermal Energy Storage (TES) system is a proven technology to store/release a large amount of energy as latent heat during the phase transition process. In spite of the advantages, a major weakness with PCMs is their low thermal conductivity in both solid and liquid phases which seriously affects the heat transfer rate. Over the past two decades various efforts have taken place to enhance the heat transfer rate during the melting/solidification process of phase change material (PCM) encapsulated in various shape of containers. However, very few attempts have been made on accounting the heat transfer augmentation in internally finned spherical capsule. In the present study, CFD analysis is carried out to explore and report the effect of fin orientation on heat transfer enhancement of a paraffin PCM filled in an internally finned spherical capsule. Keeping the same surface area of fin but oriented differently (orthogonal and circumferential) in spherical capsule is undertaken for the computational analysis. In addition, spherical capsule with no fin configuration is also considered in the present analysis to compare with finned configuration results. The CFD results showed that the orthogonally finned spherical capsule resulted in appreciable reduction in total time taken for complete melting/solidification process than the circumferential fin and no fin configuration. The same computational study is performed experimentally in order to validate the CFD results.
A comprehensive parametric investigation of hemispherical cavities on thermal performance and flow-dynamics in the triangular-duct solar-assisted air-heater
(Elsevier, 2021) Bhattacharyya, Suvanjan
The thermal energy available in the form of solar radiation is collected and converted into heat with the help of a solar air heater. The flow and thermal characteristics change significantly with the cross-sectional shape of the flow passage. The effect of hemispherical dimple-cavities that were employed over the heat-collector plate has been analyzed based on the flow and heat characteristics of a triangular solar air heater. A comprehensive investigation of roughness and flow parameters is carried out experimentally, while the flow dynamics over the heat-collector plate are predicted using commercial software (ANSYS). The remarkable results are observed in terms of Nusselt number and friction factor with the use of dimples over the heat-collector plate in the solar air heater. The higher heat transfer is noticed at the training edge in comparison to the leading edge of the dimple. The best augmentation in Nusselt number obtained is of the order of 5.33 that is observed for transverse-pitch ratio, longitudinal-pitch ratio and relative dimple depth values of 11, 11 and 0.039 respectively, at Reynolds number value of 2160. A close fit curve was obtained between the values obtained from the developed correlation and experimental values with a maximum error of 6.61% and 7.03%, respectively.
A comprehensive review on composite phase change materials for sustainable thermal energy solutions: Advances and barriers
(Elsevier, 2025-10) Bhattacharyya, Suvanjan
Composite Phase Change Materials (CPCMs) have gained significant attention for their potential in thermal energy storage (TES) due to their high latent heat capacity. These materials offer a promising solution for addressing global energy challenges, especially in renewable energy applications. This review summarizes recent advances in CPCMs, discusses existing challenges, and suggests future research directions. While phase change materials (PCMs) are key for thermal management due to their high energy density, they face limitations such as low thermal conductivity, leakage during phase transitions, and poor stability. To address these issues, additives like nanoparticles, expanded graphite, and polymers have been incorporated into CPCMs, improving thermal conductivity, stability, and energy storage efficiency. Research has shown that carbon-based nanomaterials can enhance thermal conductivity by up to 137% and improve thermal cycling durability. Innovative CPCM formulations, such as eutectic mixtures and hybrid composites, help overcome phase stability and leakage issues. Microencapsulation has also made strides, enhancing PCM containment and functionality, with dual-layer encapsulated CPCMs maintaining latent heat efficiency for over 200 cycles with minimal degradation. Nanomaterials like graphene and carbon nanotubes further reinforce thermal properties. CPCMs are widely used in solar thermal systems, building temperature regulation, and industrial waste heat recovery. In concentrated solar power systems, CPCMs have shown outstanding thermal storage capabilities and efficiencies, with some surpassing 90% solar-to-thermal conversion. Despite these advances, challenges remain, including high production costs, material degradation, and environmental concerns. Future research should focus on improving stabilization, scalability, and eco-friendly materials. The review concludes by highlighting research gaps and the potential of integrating CPCMs with smart technologies for dynamic thermal management, underscoring the need for cross-disciplinary strategies to optimize CPCM performance for broader adoption.
A comprehensive review on lithium-ion battery thermal management (BTM) using phase change materials: advances, challenges, and future perspectives
(Springer, 2025-05) Bhattacharyya, Suvanjan
The necessity of robust battery thermal management (BTM) systems is paramount for ensuring the safety, performance, and longevity of lithium-ion batteries (LIBs), especially in high-demand sectors like electric vehicles (EVs). Effective thermal regulation is crucial to prevent thermal runaway, a potentially catastrophic event that can lead to fires. As the global transition toward renewable energy and electric mobility accelerates, the demand for sophisticated BTM systems capable of maintaining optimal battery temperatures across various operational conditions has become increasingly clear. This review focuses on the role of phase change materials (PCMs) in BTM systems, highlighting their ability to absorb excess heat through phase transitions and maintain battery stability. PCMs are particularly effective in passive and hybrid BTM systems, where energy efficiency is critical. However, the low thermal conductivity of PCMs presents a challenge, often leading to uneven cooling. Research into enhancing PCM performance through the integration of materials like metal foams, expanded graphite, and nanoparticles, as well as optimizing system designs, is ongoing. Significant advancements in hybrid BTM systems that combine PCM with air or liquid cooling have demonstrated superior thermal regulation. These hybrid systems, especially those incorporating heat pipes, effectively manage battery temperatures and improve temperature uniformity, even in high-power applications. The present review explores and discuses all these aspects of BTM. Despite challenges such as increased system mass and cost, PCM-based BTM systems offer long-term benefits, including extended battery life and reduced operational expenses. Future research is expected to focus on developing advanced materials, such as nano-enhanced PCMs, and integrating artificial intelligence (AI) for real-time optimization of BTM systems. These innovations are likely to enhance efficiency and safety further, making PCM-based BTMs a key component in the future of battery technology, particularly in renewable energy and EV sectors.
A comprehensive study on the progressive development and applications of solar air heaters
(Elsevier, 2021-11) Bhattacharyya, Suvanjan
The use of solar air heaters (SAH) for the collection and effective utilization of solar radiations for thermal applications is widely reported in the literature. The current article aimed to present a comprehensive literature review on history, fundamentals and the latest advancement reported in the field of solar thermal air heating systems. Various designs of solar collectors viz, evacuated tube, flat plate, multiple passages, a cross-section of the flow passage, etc. are reported and discussed. Techniques which are used for performance enhancement of SAHs such as artificial roughness, fins, baffles, vortex generators, etc. are discussed and a comparative performance assessment has been carried to identify thermohydraulic performance parameter to select the optimum configuration that can be further used for applications. A few key recommendations are also concluded from the literature for the effective design and implementation of the SAHs.
Computational Approaches in Industrial Centrifugal Pumps
(Intechopen, 2022-09) Bhattacharyya, Suvanjan
The 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.
Computational heat transfer analysis of a counter-flow heat exchanger with fins
(RDME, 2015) Bhattacharyya, Suvanjan
A 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.