avijit karmakar , ph.d .
Postdoctoral Research Associate at Purdue University
postdoctoral research associate purdue university
ph.d. graduate mechanical engineering seeking postdoctoral researcher/research engineer position background multiphase fluid flow thermal science . managed arpa-e netl project performing thermal system design optimization cfd simulation ; timely delivered result recommendation technical report project . excellent academic achievement learning ability ; strong detail-orientated multi-task handling skill . technical skill include : software : openfoam , ansys fluent , tecplot , paraview , matlab . methodology : volume fluid , porous medium , phase change heat transfer . program . lang . : c++ , fortran , python , hpc parallelization ( openmp openmpi ) . op systems/office : linux ( ubuntu ) , window , ms-office . machine learning : regression , neural network , system design , support vector machine , unsupervised learning .
Purdue University
https://www.linkedin.com/company/purdue-university
West Lafayette, Indiana, United States
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Postdoctoral Research Associate
Illinois Institute of Technology
https://www.linkedin.com/company/illinois-tech
- Developed steady-state design model of heat and mass exchanger for enhanced cooling tower technology. (Project Funding: NETL, DE-FE0031833)
- Utilized genetic algorithm to provide optimum design variables with maximum cooling from cooling tower. 
- Partnered with power industries for cost analysis and performed design optimizations resulting in 3% increase in plant efficiency and 20% reduction in makeup water.
Chicago, Illinois, United States
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Research Assistant
Illinois Institute of Technology
https://www.linkedin.com/company/illinois-tech
- Developed steady-state design model of encapsulated PCM heat exchanger for dry cooling systems. (Project Funding: ARPA-E, DE-AR0000572)
- Utilized genetic algorithm to provide optimum design parameters with least capital cost. 
- Collaborated with energy industries for techno-economic analysis and performed design optimizations based on cost-performance trade-off resulting in 10% cost reduction and improved thermal performance of PCM based cooling system over state-of-the-art dry cooling system.
- Executed high-fidelity CFD studies (VOF, LES & Porous Media) resulting in thermofluidic correlations to predict EPCM heat exchanger performance.
- Improved water film containment on hydrophobic tube surfaces with tube structural modifications and CFD studies utilizing dynamic contact angle models (Kistler, Yokoi) in OpenFOAM. 
- Implemented 3-phase evaporation model (liquid, liquid-vapor, and gas) in OpenFOAM framework and quantified water loss in EPCM heat exchanger within 10% to experimental predictions.
- Headed and coordinated research project with quarterly reports, presentations for review meetings with ARPA-E & communicated findings with program managers.
Chicago, Illinois, United States
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Research Assistant
The University of Memphis
https://www.linkedin.com/company/the-university-of-memphis
- Executed preliminary high-fidelity CFD simulations (VOF) for design of encapsulated PCM heat exchanger.
Greater Memphis Area
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Research Assistant
CESC Ltd.
https://www.linkedin.com/company/cesclimited
- Evaluated Free Air Delivery of compressor units and performed root cause failure analysis for compressor components to identify the health deterioration of compressors in plant. 
- Proposed remedial action resulted in desired air quality and increase in Free Air Delivery by 30%.
Kolkata, West Bengal, India
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Summer Internship
Indian Railways
https://www.linkedin.com/company/indian-railways-new
▪ Received an overview of the activities performed in the workshop. 
▪ Performed a detailed analysis of Fuel Injection Pump in WDM2 locomotives.
Kharagpur Area, India
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Summer Internship
Doctor of Philosophy (PhD)
Mechanical Engineering
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Illinois Institute of Technology
https://www.linkedin.com/school/illinois-tech/
Doctor of Philosophy (PhD)
Mechanical Engineering
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The University of Memphis
https://www.linkedin.com/school/the-university-of-memphis/
Master of Technology (M.Tech.)
Mechanical Engineering
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Indian Institute of Technology, Kanpur
https://www.linkedin.com/school/indian-institute-of-technology-kanpur/
Bachelor of Engineering (BE)
Mechanical Engineering
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Bengal Engineering and Science University, Shibpur
https://www.linkedin.com/school/iiests/
The performance of a falling film heat exchanger depends significantly on the flow characteristics and the associated heat transfer in the liquid film flowing over its horizontal tube surfaces. In this study, three-dimensional numerical simulations based on the Volume of Fluid method are conducted to investigate the hydrodynamic behavior of a falling film over horizontal round tubes with diameter and tube-to-tube spacings each of 16 mm. Using a mixture of water and ethylene glycol, the simulations comprise a range of flow rates (Re = 15 to 210) that covers all basic intertube flow modes i.e., droplet, jet (in-line and staggered), and sheet mode. InterFoam, a two-phase incompressible flow solver in OpenFOAM, has been used to simulate the flow field. The numerical results present the variation of the liquid film thickness and the film interface velocity over the tube surface for all the flow modes. The flow mode characteristics alter the film thickness and flow velocity distribution over the tube surface and are expected to play an essential role in the surface heat transfer behavior over round horizontal tubes. A set of correlations have been presented to predict the film thickness and interfacial velocity over the tube surface for each of the studied modes of flow with reasonable accuracy.
Numerical simulation of falling film flow hydrodynamics over round horizontal tubes
International Journal of Heat and Mass Transfer
https://www.sciencedirect.com/science/article/abs/pii/S0017931021002787
Two-dimensional flow past a square cylinder close to a free surface is studied numerically to investigate the effect of Froude numbers (0.0–0.6) and gap ratios (0.2–1.2) on the wake behavior and integral parameters. The multiphase approach with the modified volume of fluid method is employed to study the flow. InterFoam, a two-phase incompressible flow solver in OpenFOAM, has been used to simulate the flow field. The surface deformation is found to increase with the increasing Froude number, which, in turn, produces substantial surface vorticity to cross-cancel the vorticity of the separated shear layer generated near the top surface of the cylinder. At high Froude numbers, merging of shed vortices in the cylinder downstream was encountered that possessed a period twice that in the formation region. For a fixed Froude number, with a decrease in the gap ratio, the amount of cross-cancellation between the top shear layer and the free surface increases. This enhanced interaction leads to diffusion of the vortices from the top shear layer to smaller downstream distances as the cylinder moves close to the free surface. Under such effects, the integral parameters (drag and lift coefficients and Strouhal number) are found to be a strong function of the Froude number and gap ratio. A comparison study of the wake structures with that of a circular cylinder shows the close resemblance in the large scale structures of the two flow fields. In terms of integral parameters, both the bluff bodies possess a similar behavior with the variations of the Froude number and gap ratio, but the magnitudes are quite different due to the differences in the separation points.
Unsteady flow past a square cylinder placed close to a free surface
AIP Physics of Fluids
https://aip.scitation.org/doi/abs/10.1063/5.0028101
The performance of a falling-film heat exchanger is strongly linked to the surface characteristics and the heat transfer processes that take place over the tubes. The primary aim of this numerical study is to characterize the influence of surface wettability on the film flow behavior and its associated surface heat transfer in the jet-flow mode. Volume of Fluid (VOF) based simulations are carried out for horizontal tubes with different surface wettabilities. The wettability of the tube surfaces is represented using the Kistler's dynamic contact angle model. Surface wettability effects ranging from superhydrophilic to superhydrophobic are studied by varying the equilibrium contact angle from 2° to 175°. Two different liquid mass flow rates of 0.06 and 0.18 kg/m-s corresponding to the inline and staggered jet flow modes are studied. Results are presented in terms of the liquid film thickness, the contact areas between the different phases (solid-liquid and liquid-air), and the heat transfer coefficient or Nusselt number. The resistance imposed by the increasing contact angles inhibits the extent of the liquid spreading over the tube surface, and this, in turn, influences the liquid film thickness and the wetted area of the tube surface. A significant decrement in the heat transfer rate from the tube surfaces was observed as the equilibrium contact angle increased from 2° to 175°. The local distributions of the Nusselt number over the tube surface are strongly influenced by the flow recirculation in the liquid bulk.
Wettability Effects On Falling Film Flow and Heat Transfer Over Horizontal Tubes in Jet Flow Mode
ASME Journal of Heat Transfer
https://doi.org/10.1115/1.4048088
In this chapter, a comprehensive review of numerical studies for falling liquid films over plain flat surfaces and horizontal tubes have been presented in terms of flow hydrodynamics and coupled heat and mass transfer. The early studies on the falling film transport models were based on simplified assumptions, and the reduced equations yielded approximate solutions. Developments in Computational Fluid Dynamics (CFD) led by Professor Spalding at Imperial College since the 1960s have enabled the solution of the full set of equations, and space- and time-accurate solutions. The present review primarily discusses recent studies that are based on the solution of the full set of coupled liquid–gas flow equations and highlights some key observations based on these studies. For liquid film flow over plain flat surfaces, the review highlights the important role of interfacial waves and the associated enhancement in the sensible heat transfer rates. However, the impact of these interfacial waves on coupled heat and mass transfer and the potential interaction of these waves with the gas medium is not fully understood. For film flow over horizontal tubes, the recent literature has made significant progress through full-scale models and employing sharp interface capturing techniques. Time- and space-resolved calculations for falling film evaporation over horizontal tubes are currently limited in the literature, but could reveal key underlying mechanisms and/or assist in developing underlying models related to dry-out conditions.
A Review of Computational Models for Falling Liquid Films
Springer, Singapore
https://doi.org/10.1007/978-981-15-2670-1_16
The performance of a falling-film heat exchanger is strongly linked to the surface characteristics and the heat transfer processes that take place over the tubes. The primary aim of this numerical study is to characterize the influence of surface wettability of tubes on the falling film flow mode and its associated surface heat transfer. Surface wettability is generally characterized by the contact angle and, in this study, the wettability characteristics ranged from superhydrophilic to a superhydrophobic tube surface. The dynamic motion of the triple contact line connecting the solid, liquid and gas phases over the tube surface is replicated with the help of the Kistler’s dynamic contact angle model. The Volume of Fluid (VOF) simulations was carried out for the flow and heat transfer of liquid flow over horizontal tubes with different surface wettabilities. The mass flow rate is such that the flow is in the jet mode where the liquid flows in the form of jets in between the horizontal tubes. This corresponds to a liquid mass flow rate per unit tube length of 0.06 and 0.18 Kg/m-s, under which the inline and staggered jets modes of flow are observed. Under the two flow rates and different surface wettabilities, the liquid flow hydrodynamics over the tube surfaces was explored in terms of the liquid film thickness, the contact areas (solid-liquid and liquid-air) between the different phases, and the heat transfer coefficient. The axial resistance imposed by the increasing contact angle tends to inhibit the extent of the liquid spreading over the tube surface and this, in turn, influences the liquid film thickness and the wetted area of the tube surface. A significant decrement in the heat transfer rate from the tube surfaces was observed as the equilibrium contact angle ranged from 2° to 175°. Fluid recirculations were observed in the liquid bulk which had a major impact on the heat transfer distribution over the tube surface.
Wettability Effects on Falling Film Heat Transfer Over Horizontal Tubes in Jet Flow Mode
ASME
https://doi.org/10.1115/HT2019-3532
In this study, the performance of a heat exchanger (HX) with encapsulated phase change material (EPCM) undergoing alternating melting and freezing is studied with the intent of analyzing the thermal behavior and optimizing its performance. The specific application of the EPCM HX is to cool the exiting hot water stream from the steam condenser in a power plant in lieu of a traditional cooling tower. The HX consists of a series of stacked flattened tubes with encapsulated phase change material (PCM) and arranged in lateral sections that are alternately exposed to orthogonal streams of the hot water and the ambient air drawn by a fan. A systems-level code was developed to predict the quasi-steady state and transient performance of the HX. Using large-eddy simulations, new heat transfer and pressure drop correlations for in-line flattened tube banks were developed to predict the HX performance. The capital cost of the HX is minimized using the genetic algorithm for a specific cooling duty and coefficient of performance (COP). The effect of various design parameters on the capital costs is also studied. The study shows that using PCMs with different melting temperatures along the water flow direction enhances the overall heat transfer. It is observed that more PCM is required to meet the desired COP and cooling duty for EPCM HX with a smaller footprint or height due to lower allowable air velocity, thus demanding a higher tube surface area. The transient simulations reveal that the PCM undergoes sensible heat transfer locally due to spatial nonuniformities in heat transfer distribution.
Optimization and Analysis of a Heat Exchanger with Encapsulated Phase Change Material
American Institute of Aeronautics and Astronautics
https://doi.org/10.2514/1.T5720
Phase change materials are commonly utilized in several heat transfer applications due to the potential of capturing the high rates of latent heat transfer associated with phase change. In this study, the performance of a heat exchanger (HX) with encapsulated phase change material (EPCM) is studied with the intent of analyzing the thermal behavior and optimizing it’s performance. The intended application for the HX is in cooling the exiting water stream from the steam condenser in a power plant. The heat exchanger consists of stacked flattened tubes enclosing PCM and arranged in sections that are alternatively exposed to the hot water and colder air. The heat exchanger is divided to separate modules with different PCM melting temperatures in the HX height. A new heat transfer and pressure drop correlations for flattened tubes were developed from 144 high fidelity large eddy simulations (LES) and used to optimize the heat exchanger performance. Genetic Algorithm (GA) is utilized in the optimization process for a specific heat capacity to minimize the capital cost (PCM volume) while maintaining a minimum value of the coefficient of performance (COP) as a measure of the operational cost. Under a specific heat load, the effect of the number of vertical modules, number of sections, HX footprint and height on the PCM volume is studied. The study shows that increasing the number of modules decreases the required PCM volume. It is also found that the amount of the required PCM volume increases for smaller footprint and height of HX. A transient model is developed to predict and analyze the unsteady thermal performance of the optimum EPCM HX design.
Optimization and Analysis of a Heat Exchanger with Encapsulated Phase Change Material
AIAA SciTech Forum, (AIAA 2019-0533)
https://doi.org/10.2514/6.2019-0533
A three-dimensional Computational Fluid Dynamics (CFD) model based on the VOF method is developed to investigate the local and average heat transfer behavior of a falling film on horizontal round tubes. Simulations are conducted using water, ethylene glycol, and their mixture (50% by volume) under a constant heat flux with different tube diameter and tube spacing, and with a range of flow rates that covers all flow modes. The computational model is validated with the available experimental data. The distribution of the local heat transfer coefficient depends on the flow features in each mode: it is constant in the axial direction with significant variation in the circumferential direction for the sheet mode, shows substantial variations in both directions for the jet mode (inline and staggered), and droplet mode. The average Nusselt number behavior increases with the flow rate for all the liquids. The heat transfer coefficient increases with the tube spacing. The increase with spacing is mainly due to the higher velocity of jet impingement and smaller diameter of the jet between the tubes. The heat transfer coefficient is higher in tubes with a smaller diameter. This is due to the flow impingement and the thermal layer development occupying a relatively larger fraction of the heat transfer area over tubes with a smaller diameter.
Heat transfer characteristics of Falling Film over Horizontal Tubes- A Numerical Study
55th AIAA Aerospace Sciences Meeting, AIAA SciTech Forum
http://arc.aiaa.org/doi/abs/10.2514/6.2017-0901
This project will develop and demonstrate a prototype of an economically viable all-weather Sub-Dew Point Cooling Tower (SDPCT) up to 100 kilowatt-thermal with inlet air pre-cooling and dehumidification. System performance will be experimentally tested and modeled for a wide range of process temperatures and flow rates. Data will be collected for the project team review, analysis, and modeling verifications. A techno-economic analysis will consider supercritical coal-fired power plants located at three typical U.S. locations and three ambient conditions at each location. This range will assess if SDPCT technology provides substantial benefits for specific locations.
Enhanced Cooling Tower Technology for Power Plant Efficiency Increase and Operating Flexibility (DE-FE0031833)
The project aims at developing economically viable indirect dry cooling system that utilizes a recirculating high surface-area mesh heat exchanger with encapsulated phase-change materials (EPCM). Hot water exiting the condenser is cooled by melting phase change materials embedded in thin hydrophobic polymer shells/tubes that are interconnected to form a mesh like structure. The tubes are mounted on rotary systems that continuously circulate them out of water into the air-side flow path, using the technology developed for rotary pre-heaters. As ambient air passes across the meshes, the phase change materials solidify and rejects the heat to the air. The solidified structures then travel back to the hot water side to complete the cycle. The tube modules will be designed to have high heat capacity, high heat transfer coefficient for both air and water, large surface area, low pressure drop and hence low cost.
Indirect Dry Cooling Using Recirculating Encapsulated Phase Change Materials , EPRI-ARPAE (DE-AR0000572)
Coursera
www.coursera.org
XDPPLTJCCF35
Machine Learning
https://www.coursera.org/account/accomplishments/verify/XDPPLTJCCF35
https://www.linkedin.com/in/partha-mukherjee-11bab45
West Lafayette, IN
Partha Mukherjee
Professor of Mechanical Engineering at Purdue University
https://www.linkedin.com/in/lilendra-maharjan-9bab4097
Greater Milwaukee
Lilendra Maharjan
Industrial Engineer
https://np.linkedin.com/in/smarika-tamrakar-0790896b
Bāgmatī, Nepal
Smarika Tamrakar
Project Team Leader/
Senior Mechanical Engineer at
NEA Engineering Company
https://www.linkedin.com/in/aleanagongal
Des Moines Metropolitan Area
Aleana Gongal
Precision Agriculture, Perception, Test Automation, Product Development, Mechanical, CAD
https://de.linkedin.com/in/anindya-nag-125436aa
Dresden
Anindya Nag
Assistant Professor at Technische Universität Dresden
https://www.linkedin.com/in/namho-kim-05b389137
Livermore, CA
Namho Kim
Engine Combustion Research
https://in.linkedin.com/in/raghavendra-gurram
Kochi
Raghavendra Gurram
Officer at Federal Bank - Capital markets Operations
https://in.linkedin.com/in/pravrittkushwaha
Kerala, India
PRAVRITT KUSHWAHA
Federal Bank | Automotive Enthusiast | Graphic Designer | Event Organizer | Photographer | Ex-Student Council
https://ca.linkedin.com/in/dr-appa-rao-dekka-b7bb7325
Thunder Bay, ON
Dr. Appa Rao Dekka
Assistant Professor at Lakehead University
https://in.linkedin.com/in/vijay-anand-9394738
Noida
Vijay Anand
Senior Manager - Simulation & Testing Group at Denso Subros Thermal Engineering Centre
https://in.linkedin.com/in/yadu-krishna-d
Bengaluru
Yadu Krishna
Senior Human Resources Generalist at SABIC
https://dk.linkedin.com/in/sanjeevikumarpadmanaban
Herning
Sanjeevikumar Padmanaban, FIETE, FIE, FIET (UK), CEng, SMIEEE
Subject Editor Electrical Engineering (FACETS Journal) at Canadian Science Publishing
https://www.linkedin.com/in/shreyashegde1
Middletown, CT
Shreyas Hegde
Senior Engineer Compressor Aerodynamics | PW | Aerospace | Aviation | Gas Turbines
https://in.linkedin.com/in/girish-kumar-ramaiah-85507257
Bengaluru
Girish Kumar Ramaiah
Alexander von-Humboldt  Fellow
https://in.linkedin.com/in/suraj-chaubey-809a00142
Lucknow
Suraj Chaubey
Assistant Manager at Aryavart Bank
https://www.linkedin.com/in/ebrahim-nabizadeh
Houston, TX
Ebrahim Nabizadeh
Research Assistant at Rice University
https://www.linkedin.com/in/milad-habibi-a228a9a0
College Park, MD
Milad Habibi
Research Assistant at University of Maryland
https://www.linkedin.com/in/david-akinpelu-389200119
Baton Rouge, LA
David Akinpelu
Doctoral student of Mechanical Engineering | Masters' candidate of Computer Science
https://www.linkedin.com/in/tianyang-tyler-han-ph-d-bb86a98a
San Jose, CA
Tianyang (Tyler) Han, Ph.D.
Manufacturing Engineer at Tesla
https://www.linkedin.com/in/miffathasan
Reno, NV
M Iffat Hasan, EIT
Looking for an internship Opportunity for Summer 2022
Liked by Avijit Karmakar, Ph.D.
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Happy Holi everyone! An ancient Hindu festival, which later became popular among non-Hindu communities as well. Holi heralds the arrival of spring…
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Here's a look at what we've been up to over the past 6 months getting the "Water - Energy Research Lab" up and running at the Georgia Institute of…
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Glad to share this new study (recently published in the reputed #Elsevier #Fuel journal) led by Argonne National Laboratory's Multi-Physics…
American Society of Thermal and Fluids Engineers (ASTFE)
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https://www.linkedin.com/groups/12068080
CFD Jobs
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Computational Fluid Dynamics
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Computational Fluid Dynamics Group
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Purdue University Mechanical Engineering
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