Dipankar N. Basu

Dipankar N. Basu
Indian Institute of Technology Guwahati | IIT Guwahati · Department of Mechanical Engineering

PhD

About

65
Publications
6,815
Reads
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686
Citations
Additional affiliations
April 2008 - June 2012
Indian Institute of Engineering Science and Technology, Shibpur
Position
  • Professor (Assistant)

Publications

Publications (65)
Article
In the present work, we investigate the accuracy and robustness of our in-house OpenMP parallelized direct-forcing immersed boundary–lattice Boltzmann (DF-IB-LB) solver by undertaking studies on accuracy, discrete conservation, Galilean invariance and quantification of spurious force oscillations (SFO). Our study reveals that DF-IB-LB exhibits firs...
Conference Paper
With the increasing requirement for higher power density and the working fluid with lesser environmental hazards, the utilization of sCO2 in mini/micro channel has become significantly attractive. A numerical investigation has been performed to study the transient characteristics of sCO2 at supercritical pressures. The current simulation is focused...
Conference Paper
The disadvantageous temperature abnormalities associated with the large heat dissipation when operated under extreme working conditions necessitated the better thermal management to improve safety and performance. Also, limitation of mainstream cooling system, exhausting reserve of mainstream working fluids have attracted researchers to explore alt...
Article
We revisit the Partially-Saturated-Cells method (PSC) in the context of incompressible single-phase flows past stationary and moving bodies. This methodology adds a solid collision operator to the Lattice Boltzmann Equation, resulting in a unified evolution equation everywhere in the domain that suitably accounts for the boundary conditions. The un...
Article
The impact of droplets on textured or rough surfaces has garnered remarkable appreciation due to its multifarious applications such as self-cleaning, anti-icing, and anti-fouling, leading to a plethora of engineered superhydrophobic surfaces (SHPs) exhibiting different interfacial dynamics during impact. However, the prime limiting factors in using...
Chapter
Supercritical fluids have found enhanced applications in several sectors. High efficiency and high compactness associated with supercritical carbon dioxide power cycle are of major interest to the thermal engineers. Additionally, due to environment friendly properties, such as zero ODP, considerably lower GWP, non-toxic and nonflammable supercritic...
Conference Paper
Full-text available
Natural circulation boiling channels are prone to instabilities, which can cause damages to devices linked to boiling systems used in industrial applications. Instabilities can lead to critical failure in the core of nuclear reactors if not tackled with care. In this paper, a numerical approach is adopted to conduct a simulation study on the instab...
Conference Paper
Full-text available
The phenomenon of boiling is an integral component of numerous industrial processes, encompassing power generation, pharmaceuticals, food processing and microfluidics. Boiling flow is significantly influenced by flow conditions such as operating pressures, mass flux, heat flux, and inlet subcooling. Therefore, to have a proper insight into the comp...
Article
We investigate the magnetowetting behaviour of sessile ferrofluid droplets on elastomeric surfaces with different stiffness. The non-uniform magnetic field engenders deformation and splitting of the FF droplet, which is greatly influenced by the softness of the substrate. We observe that the decrease in the dynamic contact angle is maximum on the s...
Article
The nature of startup transients in a natural circulation boiling system with multiple parallel channels are governed by the interplay between numerous geometric and operating parameters. Present work focuses on numerically ascertaining the relative influence of such variables, with primary objective being to identify possible options of suppressin...
Article
The transient dynamics of a growing droplet in a yarn is explored following the spatiotemporal evolution of the three-phase contact line as well as the liquid-air interface with the help of videographic techniques and subsequent image analyses. The spontaneous capillary flow of liquids in a porous network is used to generate a droplet on the freely...
Article
Some of the modern reactor concepts are based on natural circulation boiling systems. These systems are prone to flow instabilities and parallel channel systems can exhibit peculiar types of flow oscillations. In the present work, the existence and the nature of instabilities in a parallel channel natural circulation test facility (PCNCTF) has been...
Conference Paper
Full-text available
The focus of the present work is a comparative numerical study of various immersed boundary lattice-Boltzmann (IB-LB) methods viz. direct forcing IB-LB and partially saturated method (PSM) in lattice-Boltzmann (LB) framework. An OpenMP parallelized IB-LB code is developed to analyze the performance of different methods in terms of order of accuracy...
Conference Paper
Full-text available
The cooling mechanism of Boiling Water Reactors (BWR) incorporates two-phase natural circulation process. Natural circulation involving with two-phase may raise the concern of falling in to the zone of flow instability. This instability may depend on many different factors like input power, rate of power input, operating pressure, degree of subcool...
Conference Paper
Possible appearance of instabilities is of major concern for the operation of Supercritical Water Reactor (SCWR), owing to the substantial density variation experienced by the fluid during its passage through the cooling channels. Any supercritical fluid suffers drastic variation in all thermophysical properties around the pseudocritical point, whi...
Preprint
The focus of the present work is a comparative numerical study of various immersed boundary lattice-Boltzmann (IB-LB) methods viz. direct forcing IB-LB and partially saturated method (PSM) in lattice-Boltzmann (LB) framework. An OpenMP parallelized IB-LB code is developed to analyze the performance of different methods in terms of order of accuracy...
Conference Paper
Full-text available
Natural circulation systems (NCS) are preferred passive heat removal systems. However, they are known to suffer from instabilities under certain conditions. Advanced Heavy Water Reactor (AHWR) is a new generation reactor designed by Indian engineers of the Department of Atomic Energy (DAE). It operates in the natural circulation mode even at full p...
Conference Paper
Natural circulation systems (NCS) are preferred passive heat removal systems. However, they are known to suffer from instabilities under certain conditions. Advanced Heavy Water Reactor (AHWR) is a new generation reactor designed by Indian engineers of the Department of Atomic Energy (DAE). It operates in the natural circulation mode even at full p...
Conference Paper
The Supercritical Water Reactor (SCWR) is one of the proposed designs for generation-IV reactor. Water is used as a coolant under supercritical conditions. Due to large variation in fluid properties around pseudocritical point, such systems are very much prone to thermal-hydraulic instabilities. In order to characterize such instabilities, the conc...
Article
Supercritical Water-Cooled Reactor (SCWR) is one of the advanced reactor types under Generation IV pro- gram. Similar to BWR, there are large changes in thermodynamic properties of the coolant in SCWR, but its dynamic characteristics are different from existing reactors due to the supercritical conditions of the coolant. This necessitates study of...
Article
Controlling stability behavior of single-phase natural circulation loops, without significantly affecting its steady-state characteristics, is a topic of wide research interest. Present study explores the role of loop inclination on a particular loop geometry. Accordingly a 3D computational model of a rectangular loop is developed and transient con...
Article
The prospect of achieving higher thermal efficiency with simpler plant design, projects Supercritical water reactor as a better futuristic option compared to its boiling water counterpart. However, performing lab-scale experiment with supercritical water, particularly for appraisal of stability performance, is an arduous task, considering the level...
Article
It is essential to understand the advantages gained on imposing supercritical condition in a natural circulation loop under a given set of operating condition. Therefore a computational investigation is presented for thermalhydraulic comparison of water, CO2 and R134a as working fluids in a temperature-coupled rectangular natural circulation loop....
Article
In this study, we report the consequences of the fluid/wall slippage on the micro-pumping of an immiscible binary system constituted by conducting (non-Newtonian) and non-conducting (Newtonian) fluid pair through a microchannel. We consider power-law model to represent the constitutive behaviour of the non-Newtonian fluid. We explore the effect of...
Article
Application of an electric filed on an oil droplet floated on the surface of a deionized water bath showed interesting motions such as spreading, oscillation, and ejection. The electric field was generated by connecting a pointed platinum cathode from the top of the oil droplet and a copper anode coated with polymer from the bottom of the water lay...
Article
We focus on the entropy generation minimization analysis associated with the thermo-fluidic transport of a Newtonian fluid through a hyper-porous channel formed between two asymmetrically heated parallel plates. Employing an analytical method, which is consistent with the perturbation analysis, we solve the governing transport equations taking the...
Article
Full-text available
The application of the supercritical condition in the reactor core cooling needs to be properly justified based on the extreme level of parameters involved. Therefore a numerical study is presented to compare the thermalhydraulic performance of supercritical and single-phase natural circulation loops under low-to-intermediate power levels. Carbon d...
Article
Application of One-dimensional numerical models with Boussinesq approximation is a common approach for stability evaluation of single-phase natural circulation loops. Present work focuses on assessing the viability of such approximation during nonlinear stability appraisal following transient simulation. Accordingly a 3-D computational model of a r...
Article
We investigate the transport of immiscible binary fluid layers, constituted by one conducting (top layer fluid) and another non-conducting (bottom layer fluid) fluids in a microfluidic channel under the combined influences of an applied pressure gradient and imposed electric field. We solve the transport equation governing the flow dynamics analyti...
Article
The operating conditions of supercritical water cooler reactor (SCWR) being well above the critical point of water, it is not possible to investigate its heat transfer aspects through laboratory experiments without industry-scale support. The most feasible alternative then can be to scale-down the operating parameters by fluid-to-fluid scaling with...
Poster
Full-text available
Supercritical natural circulation loop (SCNCL) is an important concept in generation-IV nuclear reactors. The use of supercritical fluids offers superior heat transfer characteristics along with enhanced thermal efficiency. It has been identified as an option for reactor core cooling. Present study attempts to develop a computational model of SCNCL...
Conference Paper
Full-text available
Supercritical natural circulation loop (SCNCL) is an important concept in generation-IV nuclear reactors. The use of supercritical fluids offers superior heat transfer characteristics along with enhanced thermal efficiency. It has been identified as an option for reactor core cooling. Present study attempts to develop a computational model of SCNCL...
Article
Computational investigation for comparative thermalhydraulic analyses of rectangular natural circulation loops is performed to propose a guideline for selecting the working fluid and nature of the loop, subcritical or supercritical, under identical levels of operating parameters like pressure, heating power and coolant temperature. A 3-d uniform-di...
Article
Full-text available
Simultaneous estimation of thermophysical and optical properties such as the thermal conductivity, the scattering albedo, and the emissivity of a 1-D planar porous matrix involving combined mode conduction and radiation heat transfer with heat generation is reported. Coupled energy equations for the gas and solid phase account for the nonlocal ther...
Article
Full-text available
This article deals with the analysis of combined mode conduction and radiation heat transfer in a porous medium, and simultaneous estimation of the optical properties of the porous matrix. Simultaneous solution of the gas- and solid-phase energy equations encompasses local thermal nonequilibrium, while the convective heat exchange term couples the...
Article
Full-text available
Thermodynamic optimization of single-stage water-LiBr absorption system was performed earlier both from first and second-law point of view. However, a realistic comparison between two approaches is essential to identify the superior one. Hence a theoretical model is developed to optimize the absorption chiller for identifying conditions correspondi...
Article
A comprehensive review of single-phase natural circulation loop (NCL) is presented here. Relevant literature reported since the later part of 1980s has been meticulously surveyed, with occasional obligatory reference to a few pioneering studies originating prior to that period, summarizing the key observations and the present trend of research. Dev...
Article
The concept of supercritical natural circulation loop (SCNCL) is an important inclusion in Generation-IV nuclear reactors. Use of supercritical fluids promises a simplified design, along with higher thermal efficiency for heat transport systems. Characteristics of such loops are markedly different from its single-phase and two-phase counterparts, w...
Article
Complex interactions of different phases, widely varying frictional characteristics of different flow regimes and the involvement of multiple scales of transport make the modelling of a two-phase natural circulation loop (NCL) exceedingly difficult. The knowledge base about the dependency of downcomer flow rate on riser-side flow patterns, particul...
Article
Dynamic analyses of system responses during sudden change in input power for single-phase natural circulation loops are only a very recent concept. The present study theoretically investigates the transient behaviour of rectangular loops, subjected to direct heat addition and convective cooling. Non-dimensional forms of governing equations have bee...
Conference Paper
Full-text available
Supercritical Water Reactor (SCWR) proposes higher thermal efficiency and simpler plant design compared to modern Boiling Water Reactors. High pressure, temperature and power requirement in SCWR, however, escalates the cost of an experimental facility significantly. Present work, therefore, focuses on designing downscaled test facilities for stabil...
Conference Paper
In order to enhance the efficiency of current light water reactors, the generation IV initiative has included the supercritical water reactor (SCWR) as one of the future designs. The rapid change in density in the vicinity of the pseudo-critical temperature leads to strong buoyancy effect at low flow rates and flow acceleration at high flow rates,...
Article
Inherent reliability and enhanced passive safety has made natural circulation loop a very popular mode of heat transport, particularly in the fields of nuclear reactor heat removal and emergency core cooling. Despite a wide range of applications and a large volume of available research studies, the disparity in modeling approaches for single-phase...
Article
An investigation on the influence of different geometric and operating parameters on the stability of a single-phase rectangular natural circulation loop having horizontal heating–cooling orientation is presented. The major objective is to identify the most plausible option of expanding stable zone of operation, which also improves steady-state flo...
Article
Entrainment of phases into each other in a two-phase Natural Circulation Loop is of critical concern in nuclear applications. Despite having serious consequences, such as, radioactivity contamination, hardly any focused study of droplet entrainment from the separator drum has been reported. Hence, a comprehensive experimental study has been perform...
Article
The last few decades have witnessed an intense research on single-phase natural circulation loops (NCLs). Nevertheless, a meticulous literature survey suggests incorporation of different modelling approaches and various types of characterizing parameters. As a result it becomes difficult to compare the performance of NCLs with different geometrical...
Article
The wide range of applications of two-phase natural circulation loops (NCLs) demands intense analyses of boiling systems, and consequently a large number of experimental and theoretical research findings are available in the literature. This comprehensive review focuses on the state-of-the-art appraisal of the related technology, with a primary foc...
Article
A model to predict the steady-state behavior of a rectangular two-phase natural circulation loop has been proposed. The analysis employs a one-dimensional two-fluid model to identify various system parameters, with particular emphasis on the subcooled boiling region. The onset of two-phase region and point of net vapor generation and associated liq...
Article
Present study aims at development of a theoretical model to simulate the steady state performance of a rectangular single-phase natural circulation loop and to investigate the role of different geometric parameters on the system behaviour. The system has been considered as a conjugate problem with interaction of the wall with loop fluid, cooling st...
Article
This study aims at modelling of a single-phase rectangular natural circulation loop as a conjugate problem to investigate the influence of ambient temperature on the steady-state temperature profile for the loop fluid and wall temperature. Finite volume technique has been employed for the solution of non-dimensional governing equations. Numerically...

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Projects

Projects (4)
Project
The aim is to develop a solver using Immersed Boundary-Lattice Boltzmann Method for the purpose of solving various Fluid-Particle interaction problems. The direct forcing diffused interface immersed boundary scheme has been used to capture the interface. The shared-memory multithreading (OpenMP) has been used to parallelize the solver.