Sudipta Saha

Sudipta Saha
University of South Carolina | USC · Department of Mechanical Engineering

Master of Science in Mechanical Engineering
Reacting Flow Simulation of Cool Flame in OpenFOAM, Supercritical Water Oxidation/Hydrothermal Flame Modeling in Fluent

About

25
Publications
8,328
Reads
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43
Citations
Introduction
Sudipta Saha is doing his PhD in Mechanical Engineering, University of South Carolina. His current work focuses on modeling and simulation of thermofluid system, reacting system and vacuum drying process.
Additional affiliations
June 2020 - September 2020
Idaho National Laboratory
Position
  • Nuclear Spent Fuel Modeling Intern
Description
  • 1. Worked on Computational fluid dynamics (CFD) modeling using high-performance computing (HPC) systems associated with aluminum-clad spent nuclear fuels 2. Developed a CFD model representative of the geometry in the SNF report on OpenFOAM platform 3. Conducted literature research of neutron poison corrosion potential in materials for DOE canisters
August 2015 - October 2020
University of South Carolina
Position
  • Research Assistant
Description
  • • Developed computational model for hybrid cooling system for heat transfer enhancement in COMSOL Multiphysics • Developed numerical model for simulating reacting flow (combustion) system in ANSYS Fluent and OpenFOAM. • Prepared annual and final reports of research outcomes for projects funded by NSF and DOE • Presented at American Society of Mechanical Engineering (ASME) International Conference
September 2014 - May 2015
University of Texas at Dallas
Position
  • Research Assistant
Description
  • Amplitude Modulation in turbulent flow over rough surfaces
Education
January 2019 - December 2021
University of South Carolina
Field of study
  • Mechanical Engineering
August 2015 - April 2019
University of South Carolina
Field of study
  • Mechanical Engineering
January 2008 - February 2013
Bangladesh University of Engineering and Technology
Field of study
  • Mechanical Engineering

Publications

Publications (25)
Conference Paper
Full-text available
Phase change driven heat transfer has been the topic of interest for a significantly long time. However, in recent years on demand sweating boosted evaporation which requires substantially less amount of the liquid medium has drawn attention as a possible way of increasing/supplementing heat transfer under convective conditions where the convective...
Article
This paper describes a numerical study of the effect of evaporative cooling on forced convective heat transfer in a system experiencing combined heat and mass transport. A multi-dimensional mathematical model has been developed to conduct simulations over a range of operating parameters to acquire insight into the dual mode cooling where convective...
Article
A global model is proposed to simulate the drying process of used nuclear fuel assemblies under vacuum drying conditions. The transient model consists of a coupled mass and energy conservation equation with appropriate source and sink terms. The classic Hertz-Knudsen expression is employed to resolve the evaporation rate and the associated water ma...
Article
In this study, a numerical investigation on mixed convection inside a trapezoidal cavity with a pair of rotating cylinders has been conducted. Three different power-law fluid indexes (n = 1.4, 1.0, and 0.6) have been considered to model different sets of non-Newtonian fluids. Four separate cases are considered dependent on the rotation orientation...
Article
This work conducts a multiphase multi-physics numerical study on this mixed mode cooling system, where evaporation of a liquid water film augments the convective cooling by evaporative heat and mass transfer. The mathematical framework consists of coupled mass, momentum, energy equation with species transport of air and evaporated water in the gas...
Conference Paper
Despite the high interest on hydrothermal flames for supercritical water oxidation (SCWO), experiments and simulations of hydrothermal flames have been limited. Efforts have been made to conduct detailed experimental diagnostics but most of the supporting numerical modeling have relied on single step chemistry. As a result, a thorough assessment of...
Preprint
This work conducts a multiphase multi-physics numerical study on this mixed mode cooling system, where evaporation of a liquid water film augments the convective cooling by evaporative heat and mass transfer. The mathematical framework consists of coupled mass, momentum, energy equation with species transport of air and evaporated water in the gas...
Presentation
Full-text available
Despite the high interest on hydrothermal flames for supercritical water oxidation (SCWO), experiments and simulations of hydrothermal flames have been limited. Efforts have been made to conduct detailed experimental diagnostics but most of the supporting numerical modeling have relied on single step chemistry. As a result, a thorough assessment of...
Preprint
Despite the high interest on hydrothermal flames for supercritical water oxidation (SCWO), experiments and simulations of hydrothermal flames have been limited. Efforts have been made to conduct detailed experimental diagnostics but most of the supporting numerical modeling have relied on single step chemistry. As a result, a thorough assessment of...
Article
Full-text available
Vacuum drying is one of the major operational processes in numerous industries such as chemical, pharmaceutical, food, plastic, textile etc. [1]. Modeling and simulation of vacuum drying process with a view to predict system properties (i.e., temperature, pressure, water content) has been therefore a topic of interest in the respective research com...
Article
Full-text available
Spent nuclear fuels are initially stored in spent fuel pools to reduce the radioactivity level and heat load through radioactive decay. After several years of cooling in the fuel pool, the spent fuels are transferred into dry cask storage to alleviate the increasing pressure on the inventory of the fuel pools. During the spent fuel transferring pro...
Presentation
Full-text available
A three-equation global model has been proposed to estimate the water evaporation rate and temperature profile of the used fuel vacuum drying process.. The simplified model can allow numerous parametric studies conducted in a computationally efficient manner and be an effective design tool for industry practice. The simple model can also be easily...
Presentation
Full-text available
A three-equation global model has been proposed to estimate the water evaporation rate and temperature profile of the used fuel vacuum drying process.. The simplified model can allow numerous parametric studies conducted in a computationally efficient manner and be an effective design tool for industry practice. The simple model can also be easily...
Presentation
Full-text available
With an escalating need to find ways to reduce the water consumption in industrial cooling system, on-demand hybrid cooling has been a topic of great interest. The main concept of this cooling method is centered upon the utilization of huge exchange of enthalpy associated with phase change process in a conventional convective cooling system. In thi...
Conference Paper
With an escalating need to find ways to reduce the water consumption in industrial cooling system, on-demand hybrid cooling has been a topic of great interest. The main concept of this cooling method is centered upon the utilization of huge exchange of enthalpy associated with phase change process in a conventional convective cooling system. In thi...
Preprint
Full-text available
With an escalating need to find ways to reduce the water consumption in industrial cooling system, on-demand hybrid cooling has been a topic of great interest. The main concept of this cooling method is centered upon the utilization of huge exchange of enthalpy associated with phase change process in a conventional convective cooling system. In thi...
Article
Full-text available
Atmospheric pressure dielectric barrier discharge (DBD) plasma operating in octamethylcyclotetrasiloxane (D4)-helium gas mixture was studied as a prospective method for the reformation of the organosilicon compounds in the carrier stream. It was found that with the application of DBD, a significant amount of D4 precipitates out of the carrier tream...
Data
Supercritical water oxidation (SCWO) has been a topic to immense interest as an effective technique/tool for hazardous aqueous waste disposal. SCWO can be achieved by introducing a hydrothermal flame as an internal heat source in supercritical water. To better understand the water oxidation at supercritical condition, it is important to unravel the...
Thesis
Full-text available
This thesis work describes a numerical study on the effect of evaporative cooling on the augmentation of forced convective cooling. In recent years, on-demand phase change boosted cooling has drawn major interest where convective heat transfer is augmented/aided by evaporative heat and mass transport processes. This dual mode (convection and evapor...
Conference Paper
Supercritical water oxidation (SCWO) has been a topic to immense interest as an effective technique/tool for hazardous aqueous waste disposal. SCWO can be achieved by introducing a hydrothermal flame as an internal heat source in supercritical water. To better understand the water oxidation at supercritical condition, it is important to unravel the...
Poster
Full-text available
This work describes a numerical study of the effect of evaporative cooling on forced convective heat transfer in a combined heat and mass transfer system. In recent years, as an attempt to emulate the perspiration process of mammals, on-demand sweating boosted cooling has drawn major interest where convective heat transfer is augmented/aided by eva...
Presentation
Full-text available
Findings: Significant improvement (4 to 5 times) in heat transfer coefficient has been observed in sweating-boosted cooling method. A critical Reynolds number has been identified beyond which the evaporative cooling effect ceases to increase further. Enhanced heat input intensifies evaporation. Surface structure improvisation holds promise to great...

Questions

Questions (5)
Question
When I do mesh conversion (gmshToFoam), I can see some additional boundary patches are created named as defaultFaces. In constant/polymesh/boundary I can see
defaultFaces    {        type            patch;        nFaces          4682;         startFace       41763839;     }
It is a full phase 3D geometry What should I do that in the 0/U and 0/p file? Should I add these default faces as patch in 0 folder boundary condition files?
Question
Hi
I am trying to build an square lattice array of perforation on a disk surface. I like to create a for loop inside a for loop. One for x positions (loop 1) and other for a y position for all the x positions (subloop of loop 1). For that I need to name the perforation number p(x_i,y_j). Can it be done on Gmsh?
Question
Both of them seems accomplish the same thing- to take account of moving mesh. Is there any specific suitability of these two methods in implementation?

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Projects

Projects (4)
Project
The Ansys Reaction Design Workbench/ Chemkin OPPDIFF application has been utilized to model counterflow cool flame formation of DME oxidation with and without ozone. The applicability/suitability of the similarity solution methods incorporated by OPPDIFF has been examined by comparing with experimental measurements. Simulations have been conducted over a range of global extinction rate (a=30~150 s-1) to study its effect on the formation of flame structure and species distribution. The effect of the prescribed radial velocity gradient boundary conditions has been analyzed to identify the key features associated with opposed diffusion flame dynamics.
Project
To develop a numerical model to study hydothermal flame formation by the combustion of methanol at supercritical condition. The discretized set of equations are solved using ANSYS reacting flow solver.
Project
1. Develop a strongly coupled numerical model to study hybrid cooling system consisting of evaporative heat and mass transfer with convective cooling 2. Validate numerical prediction with appropriate experimental findings 3. Present a comparative study on heat transfer enhancement and reduction of water consumption predicted by the proposed novel cooling strategy