Aranyak Chakravarty

Aranyak Chakravarty
Jadavpur University | JU · School of Nuclear Studies and Application

Doctor of Engineering

About

45
Publications
5,736
Reads
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151
Citations
Additional affiliations
January 2022 - May 2022
Indian Institute of Technology Madras
Position
  • Adjunct Faculty
June 2020 - present
Jadavpur University
Position
  • Professor (Assistant)
February 2020 - March 2020
Northwestern University
Position
  • PostDoc Position
Education
July 2013 - January 2019
Jadavpur University
Field of study
  • Mechanical Engineering
July 2011 - June 2013
Jadavpur University
Field of study
  • Nuclear Engineering
August 2007 - June 2011
Dr. B.C. Roy Engineering College
Field of study
  • Mechanical Engineering

Publications

Publications (45)
Article
Direct contact of steam and subcooled water under certain situations may cause immense steam condensation at the two-phase interface and can lead to the generation of fast and violent pressure surges which is often termed as condensation induced water hammer (CIWH) or direct contact condensation (DCC) driven water hammer. The present work aims at t...
Article
Full-text available
The present study aims to develop a fundamental understanding of the complex nature of fluid flow and particle transport dynamics in the alveolar region of the lungs. The acinus has a fine-scaled structure which allows for gas exchange in the blood. We model the transport characteristics of a single alveolar duct, which represents a single unit of...
Article
Full-text available
Heat-generating porous media is encountered in different industrial applications as well as natural processes-natural geysers, geothermal energy extraction, packed bed reactors, nuclear and thermal power plants etc. The present article discusses the characteristics of thermal energy removal from heat-generating porous media, considering phase chang...
Article
The present article discusses the impact of liquid coolant subcooling on multiphase fluid flow and boiling heat transfer in porous media with internal heat generation. Although extremely relevant and important, only limited studies are available in the open literature on the effects of coolant subcooling in heat-generating porous media and hence, t...
Article
Pulmonary drug delivery systems rely on inhalation of drug-laden aerosols produced from aerosol generators such as inhalers, nebulizers etc. On deposition, the drug molecules diffuse in the mucus layer and are also subjected to mucociliary advection which transports the drugs away from the initial deposition site. The availability of the drug at a...
Conference Paper
Fragmentation (or atomisation) is a very important and complex process encountered in several industrial applications. It involves the process where liquid droplets/sheets break into smaller drops and ligaments due to various hydrodynamics forces and instabilities acting on it. In this study, the governing equation for number density of different s...
Article
Full-text available
A numerical investigation of forced convective heat transfer and entropy generation characteristics around a series of heat-generating permeable bodies, placed in a confined domain, has been carried out in the present study. Considering air as an operating media, simulations have been performed for the range of Reynolds number, $Re=10-40$ and Darcy...
Conference Paper
Sometimes external abuses lead to thermal runaway of Li-ion batteries. The hazard becomes more severe when thermal runaway propagation occurs inside a Li-ion battery pack. Hence, an appropriate battery thermal management system is required for proper functioning of Li-ion battery and Li-ion battery pack. In the present work, a 2-D model of an 18650...
Conference Paper
Continuous increase in power demand of multicore processors demands investigation of effective thermal management for such devices. Job scheduling in multicore processor often produces pulsed heating phenomenon. To understand the heat transfer characteristics of multicore processors the two cores of a dual core processor have been modelled as discr...
Preprint
The present article discusses the impact of liquid coolant subcooling on multiphase fluid flow and boiling heat transfer in porous media with internal heat generation. Although extremely relevant and important, only limited studies are available in the open literature on the effects of coolant subcooling in heat-generating porous media and hence, t...
Article
The present work reports an experimental investigation of direct contact condensation during subcooled water injection into a steam-filled horizontal pipe. The experiments have been carried out using a laboratory scale experimental facility that has been set-up in the Heat Power Laboratory of Jadavpur University. The experiments are carried out for...
Article
The primary objective of this work is to numerically study the effect of system pressure on the occurrence of dryout phenomena in heap-shaped, heat-generating porous debris beds. This is achieved using a multiphase computational fluid dynamics (CFD) model that is implemented in the framework of the commercial CFD platform ANSYS FLUENT. The model is...
Preprint
The primary mode of respiratory virus transmission is by means of virus-laden aerosols. The aerosols are inhaled into the respiratory tract and deposited in the mucosa, where the virus may interact with the epithelial tissue causing infection. Transport of virus within the respiratory tract and clearance from the lungs, as such, becomes extremely i...
Article
Full-text available
Effective removal of heat from the heat-generating porous bed, particularly in a confined space, is essential due to its implications on thermal management and system safety. The safety aspect becomes particularly important during post-accident heat removal from decay heat-generating debris in nuclear reactors, as well as thermal management of self...
Chapter
Molten fuel–coolant interactions in postulated severe accident scenario of nuclear reactors lead to the formation of a porous debris bed. Substantial heat generation takes place within such debris beds as a result of radioactive decay, and this needs to be continuously removed in order to maintain the temperature of the debris material within accep...
Chapter
Direct contact condensation (DCC) of steam in subcooled water is a phenomenon which is experienced in many applications such as thermal, chemical and nuclear engineering, particularly in energy generation devices since it enables immense energy transfer via the two-phase interface. However, under certain situations, steam water direct contact can l...
Article
Direct contact condensation (DCC) of steam in subcooled water has paramount importance in many heat transfer devices in different industrial areas like nuclear, thermal, chemical plants. This work aims at the exploration of underlying physics of steam–water DCC in two dimensions using ANSYS FLUENT 14.5. The volume of fluid method is utilized for pe...
Chapter
Premixing phase is the most important stage of the postulated severe accident scenario in the molten fuel–coolant interaction (FCI) of nuclear reactor. The premixing phase of FCI phenomena is characterized by the molten fuel material coming into contact with the liquid coolant. This usually occurs in the form of jets or drops of the molten material...
Article
The present study numerically models the process of heat removal from a heat-generating porous bed with cold fluid injection from the bottom of the bed. This type of situation is encountered during postaccident situations in nuclear reactors and involves augmentation of heat removal capacity with forced coolant injection from the bottom. A steady-s...
Article
Direct contact condensation of a vapor bubble during subcooled boiling flow scenario has diverse applications in many fields such as thermal, chemical, and nuclear energies. The present work aims at the exploration of the underlying physics of single vapor bubble condensation in subcooled water following the volume of fluid method approach using AN...
Conference Paper
Molten fuel coolant interaction subsequent to a hypothetical core meltdown accident in a nuclear reactor may lead to the formation of a particulate corium debris bed. Significant studies carried out over the years have established that the most important criteria governing heat transfer and hence, the coolability of such a debris bed is the Dryout...
Conference Paper
The hydrodynamic fragmentation of the wood metal jet into a pool of water in presence of single a calandria tube is studied numerically using ANSYS FLUENT 14.5. To capture the two-phase interface behavior during the fragmentation phenomenon, Volume of Fluid (VOF) method is used. The analysis of the effect of the tube diameter, inlet jet velocity on...
Article
Full-text available
Natural convection in enclosures driven by heat-generating porous media has diverse applications in fields like geothermal, chemical, thermal and nuclear energy. The present article focuses on heat transfer and entropy generation characteristics of a heat-generating porous bed, placed centrally within a fluid-filled cylindrical enclosure. Pressure...
Conference Paper
Natural convection in heat generating porous media has been the subject of extensive study over several decades owing to its multifarious applications. The present study focuses on identifying the effect of porosity distribution on heat transfer characteristics in a cylindrical enclosure filled with heat generating porous medium. Analysis has been...
Conference Paper
Importance of investigating water hammer phenomena in fluid-filled pipelines lies from its relevance in different industrial processes. In the present work, the propagation of shock wave and the evolved pressure transients are studied for a subcooled-liquid filled tube, applying a sudden discontinuity of pressure at the middle of the tube. The ends...
Conference Paper
The phenomenon of hydraulic transients is an important issue in many industrial processes. In this work, the pressure transients occurred in a superheated-vapor filled tube is explored in the context of steam hammer. The tube ends are closed. The propagation of pressure build-up (of 20 bar) in the middle portion of the tube is taken for the present...
Conference Paper
Full-text available
The present work reports the thermal phenomena and heat transfer due to the presence of a heated cylinder inside a porous cavity. Both uniformly and sinusoidally heated conditions are considered. The cavity top wall is cooled and rest of the walls are insulated. Comparative assessment of thermal performance under various parametric variations is pe...
Conference Paper
In a hypothetical severe accident scenario of a nuclear reactor, the reactor core might undergo tremendous heating in absence of adequate heat removal mechanism and may form molten state. The molten core material (or corium) progresses towards the reactor pressure vessel lower head in a form of jet and interact with the cold water which may lead to...
Conference Paper
Molten corium-coolant interactions, as a consequence of severe accident in a nuclear reactor, may lead to the formation of a decay heat generating corium debris bed. It is essential to ensure proper cooling of such a debris bed in order to limit temperature rise within the bed and prevent accident progression. One of the widely used mechanisms of d...
Conference Paper
Direct contact condensation is the driving force of condensation induced water hammer (CIWH) phenomenon. The present work is an initial effort to predict the fast and such dangerous pressure transients which may by generated during the occurrence of CIWH by using an in-house code. In this work, a 1-D two-phase shock tube problem is considered as a...
Conference Paper
The shock wave propagation in one-dimensional isentropic flow through the convergent-divergent nozzle is a benchmark problem to understand shock wave phenomenon. In the present work, shock wave propagation in air and superheated vapour is studied using an in-house code. The Method of Characteristics (MOC) is used to solve governing hyperbolic diffe...
Conference Paper
Full-text available
The present work reports thermo-magneto-convective transport of fluid and heat in a discretely heated lid-driven square enclosure. Left and bottom wall is partially uniformly heated, whereas top wall is cold and translating with uniform velocity, rest of the walls are thermally insulated. A uniform magnetic field inclined at an angle  with respect...
Article
Direct contact condensation (DCC) is almost an inevitable phenomenon during accidental condition for all LWRs. Rapid condensation caused by the direct contact of steam and subcooled water can lead to condensation induced water hammer (CIWH). The present work explores the underlying physics of CIWH phenomenon in a horizontal pipe under different inl...
Article
Analysis of natural convection in enclosures containing heat generating porous medium has important applications related to geothermal, chemical, thermal and nuclear energy such as in-vessel cooling of debris beds in nuclear reactors, cooling of coal stockpiles etc. The objective of the present numerical study is to characterise the pattern of flui...
Conference Paper
Direct contact condensation (DCC) is almost an inevitable phenomenon irrespective of normal, transient and accident condition for all LWRs. The rapid condensation caused by the direct contact of steam and subcooled liquid can lead to Condensation Induced Water Hammer (CIWH) which has been a historical problem in nuclear power industries and has a p...
Conference Paper
Molten corium-coolant interaction subsequent to a hypothetical severe accident in a nuclear reactor may lead to formation of a particulate debris bed. The present study uses ANSYS Fluent 14.5 to perform a single phase numerical analysis of a heat generating, truncated conical porous debris bed placed centrally within a cylindrical water-filled encl...
Article
A continuous quest for efficient utilization of energy resources has motivated the researchers to search for optimal design and operating conditions during various energy conversion techniques. These conditions for such systems are often proposed by minimizing the destroyed exergy potential in course of the process. In the present paper a second la...
Article
In the present work, axial power flattening effect due to insertion of adjuster rods is modeled and a heat generating fuel pin in an annular channel is characterized. The effect of insertion of single adjustor rod at the peak heat generation region is modeled as two heat sources and one heat sink. The results obtained from the developed model indic...
Article
Passive Systems are increasingly playing a prominent role in the advanced nuclear reactor systems and are being utilised in normal operations as well as safety systems of the reactors following an accident. The Passive Containment Cooling System (PCCS) is one of the several passive safety features in the Advanced Heavy Water Reactor (AHWR). In this...

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Projects

Project (1)
Project
To improve energy efficiency of a system using classical geometry