Amirhosein Sarchami
PhD Student, 2023 - present.
Porous Media Flow, Two-Phase Flow, Thermal Management, Optical Microscopy
Posts by Collection
people
Ayaaz Yasin
PhD Student, 2022 - present.
Computational Fluid Dyanmics, Multiphase Flows, Phase Change Modeling, Numerical Analysis
Denis Fulks
BS Student, May 2024 - August 2024.
Sensor Design and Calibration, Control Systems, CAD Modeling, 3D Printing
Ermiyas Lakew
MS Alum, 2021 - 2022.
MS Thesis, "Thin Film Evaporation Modeling of the Microlayer Region in a Dewetting Water Bubble", 2022. Currently R&D engineer at FERNO.
Kishan Bellur
Principal Investigator, 2021 - current.
10+ years of experience in phase change heat transfer, capillary phenomena, cryogenics and scientific computing
Manjeera Vinnakota
PhD Alum, 2016 - 2024.
PhD Dissertation, "Design and Investigation of a Hydraulic Milli-Actuator for Minimally Invasive Medical Applications", 2024. Currently at Ethicon (J&J MedTech).
Sandeepan Dasgupta
MS Alum, 2021 - 2024.
MS Thesis, "Optical Transmission through Sessile Water Droplets Undergoing Solidification, and the Effect of Hydrophobicity", 2024.
Tejas Mahajani
MS Alum, 2022 - 2024.
MS Thesis, "Experimental and Numerical Investigation of Isothermal Bubbling in Shear-thinning Liquids", 2024. Currently at Johnson Controls.
Unmeelan Chakrabarti
PhD Student, 2022 - current.
Multiscale modeling of liquid-vapor phase change, CFD, Molecular Dynamics
William Cullen
MS Student, 2023 - present.
Lidenfrost Effect, Droplet Manipulation, Removal of Particulate Matter using Liquid Droplets
publications
Neutron Radiography of Condensation and Evaporation of Hydrogen in a Cryogenic Condition
Journal of Heat Transfer, 2015.
Visualization of the Evaporation/Condensation Phenomena in Cryogenic Propellants
Journal of Flow Visualization and Image Processing, 2016.
Contact Angle Measurement of Liquid Hydrogen (LH2) in Stainless Steel and Aluminum Cells
Journal of Heat Transfer, 2016.
A new experiment for investigating evaporation and condensation of cryogenic propellants
Cryogenics, 2016.
Examining Liquid Hydrogen Wettability using Neutron Imaging
Journal of Heat Transfer, 2016.
Neutron attenuation analysis of cryogenic propellants
Journal of Heat Transfer, 2018.
Determining solid-fluid interface temperature distribution during phase change of cryogenic propellants using transient thermal modeling
Cryogenics, 2018.
Rapidly Responsive Smart Adhesive-Coated Micropillars Utilizing Catechol-Boronate Complexation Chemistry
Soft Matter, 2019.
Optical Properties and Swelling of Thin Film Perfluorinated Sulfonic-Acid Ionomer
ECS Transactions, 2019.
A multi-scale approach to model steady meniscus evaporation
Physical Review Fluids, 2020.
Drifting mass accommodation coefficients: in situ measurements from a steady state molecular dynamics setup
Nanoscale and Microscale Thermophysical Engineering, 2020.
Results from neutron imaging phase change experiments with LH2 and LCH4
Cryogenics, 2022.
The data discussed in this manuscript has been converted to an open access data article and is available here. It contains a link to a Mendelay data repository where the entire cryo/neutron dataset can be accessed.
Data from cryo-neutron phase change experiments with LH2 and LCH4
Data in Brief, 2022.
This is an open access data article. It contains a link to a Mendelay data repository where the entire cryo/neutron dataset can be accessed. A brief description of the data is also provided. The corresponding research article is available here.
Thin Film Evaporation Modeling of the Liquid Microlayer Region in a Dewetting Water Bubble
Fluids, 2023.
Design and Modeling of a Miniature Hydraulic Motor for Powering a Cutting Tool for Minimally Invasive Procedures
Micromachines, 2023.
Modeling Liquid-Vapor Phase Change Experiments: Cryogenic Hydrogen and Methane
Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2023.
Investigating the Efficiency of a Novel Combined Direct/Indirect Thermal Management System in Optimizing the Thermal Performance of a New Generation 46800-Type LIB Pack
Applied Thermal Engineering, 2023.
An Investigation of Phase Change Induced Marangoni Dominated Flow Patterns Using the Constrained Vapor Bubble Data from ISS Experiments
Frontiers in Space Technologies, 2023.
Scaling a Hydraulic Motor for Minimally Invasive Medical Devices
Micromachines, 2024.
research
Neutron Imaging
Short description of portfolio item number 1
Accommodation Coefficients
Short description of portfolio item number 1
talks
Neutron Bidography of Condensation and Evaporation of Hydrogen in a Cryogenic Condition
Published:
The presentation focused on the setup and preliminary images from a feasibility campaign. This was the first time neutron images of evaporating liquid hydrogen was presented. The presentation resulted in a journal article published in Journal of Heat Transfer
A new experiment for determining evaporation and condensation coefficients of cryogenic propellants
Published:
NASA Early Stage Innovation Workshop on âMeasuring Accommodation Coefficientsâ.
Kinetic modeling and neutron imaging experiments of evaporation in cryogenic propellants
Published:
The graduate research colloquium is an opportunity to share student research with the university community and gain experience in presenting in a conference style setting.
A New Experiment for Determining Evaporation and Condensation Coefficients of Cryogenic Propellants
Published:
The presentation focused on the development of a new experimental method to determine accommodation coefficients. The ability to visualize liquid hydrogen was emphasized The presentation resulted in a journal article published in Cryogenics
Contact angle measurement of Hydrogen in a Cryogenic Condition
Published:
Contact angles of liquid hydrogen as measured by neutron image analysis were discussed.
Neutron Radiography of Condensation and Evaporation of Hydrogen in a Cryogenic Condition
Published:
Wettability of hydrogen is investigated through neutron image processing using a conical cell and results discussed. The presentation resulted in a journal article published in Journal of Heat Transfer
A new method to investigate evaporation and condensation of cryogenic propellants and determine accommodation coefficients
Published:
A poster presented to the chemistry community emphasizing the applicability of using neutron imaging to understand fundamental surface science.
Determining the evaporation and condensation coefficients of cryogenic propellants
Published:
The poster presentation won a 3rd place award in the graduate student category!
Determining solid-fluid interface temperature distribution during phase change of cryogenic propellants using transient thermal modeling
Published:
Kishan Bellur received a scholarship to travel/attend/present at this workshop. The presentation resulted in a journal article published in Cryogenics
Neutron attenuation analysis of cryogenic propellants
Published:
The presentation resulted in a journal article published in Journal of Heat Transfer
A novel method to determine accommodation coefficients of cryogenic propellants
Published:
The presentation focused on the ability to to combine experimental data with computational modeling to obtain the accommodation coefficients. Experimental data and progress on the modeling framework was presented.
Visualization of Evaporation/Condensation in Cryogenic Propellants
Published:
Kishan Bellur received the best oral presentation award!
A combined experimental and multi-scale modeling approach to determine phase change coefficients of cryogenic propellants
Published:
IMA workshop on Dynamic Contact Lines: Progress and Opportunitiesâ. Kishan Bellur received travel support to attend/present at this workshop.
Modeling of liquid-vapor phase change and associated processes
Published:
Invited by Prof. Mark Weislogel
Using neutron imaging to investigate cryogenic phase change
Published:
Invited by Prof. Jaroslaw Drelich.
Determining the evaporation and condensation coefficients of cryogenic propellants
Published:
The poster highlighted neutron imaging as an ideal probe to visualize cryogenic propellant phase change. Importance and applications of the accommodation coefficient of cryogenic propellants were discussed.
Grant Writing as a Graduate Student: Practical Tips and Benefits
Published:
Invited by Prof. Jaroslaw Drelich. Panel discussion with Jessica Brassard and Allison Hein.
Mass Accommodation Coefficients of Cryogenic Propellants
Published:
The first estimates of the accommodation coefficient(s) for liquid hydrogen were presented. Kishan Bellur won the best poster award!
A combined experimental and multi-scale modeling technique to determine accommodation coefficients of cryogenic propellants
Published:
The cryo-neutron experiments were presented in detail and the modeling effort was introduced briefly. The supplementary GRC talk addressed the model and the accommodation coefficients.
A combined experimental and multi-scale modeling technique to determine accommodation coefficients of cryogenic propellants
Published:
The multi-scale modeling methodology and the accommodation coefficients for liquid hydrogen and methane were discussed in detail. The supplementary GRS talk addressed the cryo-neutron experiments.
Thermo-Mechanical Phase Change Stability of Liquid-Vapor Meniscus
Published:
The stability of thin liquid films was discussed from the context of liquid-vapor phase change. A new scaling analysis was presented.
Aerospace Engineering 101
Published:
This presentation to the local Houghton community included an outdoor model rocket launch demonstration.
Multiscale modeling of liquid-vapor phase change based on experimental data
Published:
The complete cryo-neutron story is presented in an integrated modular approach. The experiments, thermal transport analysis and multi-scale evaporation modeling are combined to generate the accommodation coefficients for both hydrogen and methane. The resulting values are independent of both container material and size and agree well with a fluid independent transition state theory prediction.
Neutron Imaging: a non-destructive diagnostic tool for cryogenic propellant investigations
Published:
Invited by Prof. K. T Vasudevan
Testing fundamental assumptions using Constained Vapor Bubble (CVB) data from ISS experiments
Published:
Liquid-vapor phase change: a cryo/neutron study
Published:
Invited talk for the Dept of Mechanical and Materials Enineering graduate seminar
Guess free evaporation modeling without adsorbed film constraints
Published:
A pdf of the poster is avilable here
Testing the equivalence of phase change coefficients based on the constrained vapor bubble (CVB) data from ISS experiments
Published:
This presentation highlights Marangoni flow along the interface resulting in a complex wavy flow pattern. Steps toward determining phase change coefficients are discussed.
Thin film evaporation modeling of the microlayer region in a dewetting water bubble
Published:
A custom thin-film evaporation model was develoed to describe the microlayer region of a dewetting water bubble. The model incorporates high spatio-temporal resolution film thickness and temperature measurements and shows the mass flux non-uniformity in the microlayer region during the dewetting process.
Exploring the inequality of evaporation and condensation coefficients based on ISS experiments
Published:
Thin film evaporation modeling of the microlayer region in a dewetting water bubble
Published:
A custom thin-film evaporation model was developed to describe the microlayer region of a dewetting water bubble. The model incorporates high spatio-temporal resolution film thickness and temperature measurements and shows the mass flux non-uniformity in the microlayer region during the dewetting process.
Modeling of Liquid Microlayer Region in a Dewetting Water Bubble
Published:
We use our thin film modeling in conjunction with high resolution experimental data to show that the evaporation coefficient is not a constant but varies with time/thermophysical properties during the ebullition process.
Resolving discrepancy in accommodation coefficients by rethinking equilibrium assumptions in evaporation modeling
Published:
The cryo-neutron dataset was used in conjunction with our multiscale evaporation model to show that the interface is non-isothermal. Most studies in the past have assumed an isothermal interface based on equilibrium arguements leading to the discrepency in reported values. We showed that accounting for non-uniformity in temperature and pressure results in a predictable coefficient.
Results and lessons from cryogenic phase change experiments with LH2 and LCH4
Published:
Results and lessons from the cryo/neutron experiments were presented in detail in this 30 min lecture. The non-isothermal / non-equilibrium nature of the phase change process and its implication in reported coefficient values were discussed.
A Numerical Study of Coefficient-free Kinetic Evaporation Modeling in Liquid Hydrogen
Published:
Link to the Abstract.
teaching
Summer Youth Program - Rocketry and Space Science
Workshop, Michigan Technological University, 2018
Fluid Mechanics and Heat Transfer: Internal Flow
Undergraduate course, Michigan Technological University, 2019
In the spring semester of 2019, Dr. Bellur taught his first ever course as primary instructor: a 4 credit junior level undergraduate course in thermo-fluids. This unique course focused on fundamentals and applications of fluid mechanics and heat transfer to fluid flow in ducts and pipes (internal flow). Concepts from fluid mechanics and heat transfer were taught simultaneously in an integrated thermal-fluids approach.
Computational Fluid Dynamics
Undergraduate/Graduate course, University of Cincinnati, 2024
Prof. Bellur typically teaches EGFD 5137/6037: Computational Fluid Dynamics (CFD) every Spring semester. This is a cross-listed 3 credit course open to senior undergraduate and graduate students in the College of Engineering and Applied Sciences. The objective of the course is to familiarize students with computational methods to solve thermal-fluid and heat transfer problems. Numerical solutions to 1D equations are implemented using finite difference and validated with analytical solutions. Various discretization techniques, implicit/explicit schemes, stability and error are discussed. Commercial software tools are introduced for 2D/3D applications. Future versions of the course will transition to open source architecture.
Thermodynamics
Undergraduate course, University of Cincinnati, 2024
Prof. Bellur typically teaches MECH 2010: Thermodynamics every Fall semester. This is a second year, 4 credit, required undergraduate course in Mechanical Engineering. In this course, students will:
- learn about mass and energy balances for closed and open systems,
- develop an understanding of entropy, the second law of thermodynamics, and isentropic efficiencies of engineering devices,
- be able to use these concepts to analyze power and refrigeration cycles, and
- be able to apply principles of thermodynamics to formulate and solve engineering problems of interest. The course is highly interactive with in-class activities, open-ended projects, weekly group presentations and a tour of the UC power plant.