Index Catalog // Hyrax

Generalized Preconditioning to Accelerate Simulations with Large Multiphase Chemical Kinetics Models

O Criador:: Walker, Anthony S.
Abstract:: Combustion emissions produced from burning real transportation fuels have many environmental impacts. However, detailed chemistry across multiple phases, time scales, and thermodynamic conditions make predicting combustion emissions challenging. Detailed modeling of the gas phase alone is prohibitively expensive, due to the large size and stiffness of the kinetic models. The...
Resource Type:: Dissertation
Full Text:: Preconditioner Setup Newton IterationConverged? No Yes Preconditioned GMRES Converged? NoYes Figure 2.1

Numerical Modeling of Powder Metallurgy Hot Isostatic Pressing

O Criador:: Sobhani, Samaneh
Abstract:: Powder Metallurgy Hot Isostatic Pressing (PM-HIP) is a widely recognized powder metallurgy manufacturing process to produce near-net-shape and net-shape components. During general PM-HIP processes the metal powders are filled within a capsule (die), heated and loaded with high pressure simultaneously, and solidified to form the final product. Due to the...
Resource Type:: Dissertation

Multi-modal sensing data fusion for machining and additive manufacturing

O Criador:: Fu, Xianzhe
Abstract:: With the increased demand for high-quality products, reliable and robust process monitoring has become a key capability for modern manufacturing systems. Through sensors installed in the machinery, the real-time information was measured to assess the state of the processes. The measured data can be used to infer the mechanical, material,...
Resource Type:: Dissertation

High Temperature Electrical Properties of Ceria-Based Ceramics for Use as Electrodes in Magnetohydrodynamic Power Generators

O Criador:: Bowen, Michael S.
Abstract:: Determining the electrical properties of ceria-based materials is important for their use as electrodes in hot-wall magnetohydrodynamic (MHD) power generators with wall temperatures greater than 1500 ̊C. The electrical conductivity of a material can be used in models for predicting the performance of generator designs. More specifically, the temperature dependent...
Resource Type:: Dissertation
Full Text:: ceria had no detectable reactions with potassium vapor in a controlled argon environment up to 1200 ˚C

Development and validation of acoustic measurement techniques for void fraction in concentric annular geometries

O Criador:: Tost, Brian C.
Abstract:: This work investigates the acoustic velocity of gas-liquid mixtures in vertical, co-current flow in a concentric annulus. Acoustic velocity shows promise as a detection parameter for the presence and amount of gas in a liquid flow because of its high sensitivity to gas void fraction in a gas-liquid mixture. However,...
Resource Type:: Dissertation
Full Text:: While reflecting on what should be included in this dedication, I found real resonance (no pun

Optical sensing and metrology for on-machine surface inspection in manufacturing processes

O Criador:: Lee, Eddie T.
Abstract:: Optical sensing technologies are pivotal in the manufacturing process, specifically in defect detection, tool condition estimation, and monitoring. The research aims to enhance the accuracy, efficiency, and reliability of manufacturing metrology by employing optical sensing technologies, such as laser profilometers and image processing techniques. The dissertation proposes intelligent and flexible...
Resource Type:: Dissertation

Experimental Study of the Impact of Physical and Chemical Properties on Smoldering Combustion in Natural Fuels

O Criador:: Smucker, Benjamin
Abstract:: Smoldering combustion in wildland fires is difficult to extinguish, can transition to flaming combustion, and produces a significant amount of pollutants. It is necessary to understand parameters controlling smoldering in order to help predict the smoldering behavior and potentially mitigate these hazards. The wide variety of natural fuels that occur...
Resource Type:: Dissertation
Full Text:: Maximum temperatures at varying wind speeds. In the left-hand plot, there was no air entrainment into the

The Effect of Isothermal Aging on the Development of Long-Range Order in Ni-based Alloys

O Criador:: Aerne, Nicholas S. J.
Abstract:: Nickel (Ni)-based alloys with a high chromium (Cr) content are frequently employed in applications where elevated temperatures and/or corrosive environments are present due to their excellent corrosion resistance and mechanical properties. However, a gap exists around the formation, and kinetics of long-range order (LRO) Ni2Cr phase in both model binary...
Resource Type:: Dissertation
Full Text:: stoichiometries from the top with no Fe at 475 °C to the bottom with 10 wt. % Fe, at 330 or 360 °C. In (d) the

Process Physics, Strategies and Economics in Metal Additive Manufacturing and Digital Microstructural Control for Energy and Chemical Process Components

O Criador:: Manoharan, Sriram
Abstract:: Advances in plant construction within the energy and chemical process industries require inexpensive process intensification (PI) technology as a means to reduce plant size for enabling modular construction. One form of PI is microchannel process technology where arrays of microchannels, having hydraulic diameters on the order of 0.1 to 1...
Resource Type:: Dissertation

Computational Modeling of Smoldering Combustion in Wildland Fuels

O Criador:: Jayasuriya, Waduge Jayani A.
Abstract:: Smoldering combustion in wildland fires is a critical phenomenon that needs in-depth study because it can initiate with weaker ignition sources, can persist for long periods, is difficult to suppress, and can transit to flaming combustion. Cellulose, hemicellulose, and lignin are the major organic constituents within biomass, in varying proportions...
Resource Type:: Dissertation

Hyrax

Generalized Preconditioning to Accelerate Simulations with Large Multiphase Chemical Kinetics Models

Numerical Modeling of Powder Metallurgy Hot Isostatic Pressing

Multi-modal sensing data fusion for machining and additive manufacturing

High Temperature Electrical Properties of Ceria-Based Ceramics for Use as Electrodes in Magnetohydrodynamic Power Generators

Development and validation of acoustic measurement techniques for void fraction in concentric annular geometries

Optical sensing and metrology for on-machine surface inspection in manufacturing processes

Experimental Study of the Impact of Physical and Chemical Properties on Smoldering Combustion in Natural Fuels

The Effect of Isothermal Aging on the Development of Long-Range Order in Ni-based Alloys

Process Physics, Strategies and Economics in Metal Additive Manufacturing and Digital Microstructural Control for Energy and Chemical Process Components

Computational Modeling of Smoldering Combustion in Wildland Fuels

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