Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 47 for “"Thermal cracking"”.
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Thermal cracking in nonporous geothermal reservoirs
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1980.
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Permeability modifying processes : thermal cracking and crack healing of geomaterials
… in porosity and permeability of geomaterials: thermal cracking and crack healing by diagenesis. A suite of thermal cracking experiments was performed on andesite plugs from the geothermal field in Awibengkok, Indonesia. Permeability (k) and specific storage capacity were measured by the …
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Effects of Variables on a Soaker-Stripper Reactor for Thermal Cracking of Deasphalted Oil
… metal content. In that industrial scheme DAO is thermally cracked to generate distillates with conversion of the 553 °C+ fraction over 50%. One important current challenge is to increase that conversion level by optimization of the reactor and the flow regime inside it. In this work, a pilot …
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Validation of New Asphalt Cement Specification Test Methods Using Eastern and Northeastern Ontario Contracts and Trial Sections
… implementation of these methods should reduce thermal cracking distress in Ontario roads. Besides, a number of other properties were investigated. All recovered regular contract materials were tested at –10ºC, –20ºC, and –30ºC after various periods of conditioning. Samples were loaded for 240 …
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Comparative Evaluation of Field and Laboratory-Produced Foamed Asphalt Mixture from Reno, Nevada
… the flow number (FN). The low-temperature cracking resistance of the mixtures was evaluated using the thermal stress restrained specimen test (TSRST). From this study it was determined that the HMA had better resistance to moisture damage and permanent deformation than the foamed WMA …
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Rural electrification from local resources : biomass pyrolysis oil combustion in a direct injection diesel engine
… through two differing processes-ENSYN Rapid Thermal Process, and NREL Ablative Vortex Pyrolysis-were examined, with particular attention to the effects of the severity of thermal cracking, volatiles collection and preservation, and extent of feedstock drying. Each of these process parameters …
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Comparison of Creep Compliance Master Curve Models for Hot Mix Asphalt
… viscoelatic behavior. It is used to predict HMA thermal cracking at low temperature and permanent deformation at high temperatures. There are several experimental methods to measure the creep compliance. Two of these methods were used in this thesis; uniaxial compressive and indirect tension …
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Natural Gas Generation Potential of the Wufeng-Longmaxi and Niutitang Shale Formations, Sichuan Basin, China: Insight from Hydrous and Anhydrous Pyrolysis
… potential of the source rocks using artificial thermal maturation, e.g., pyrolysis, to investigate hydrocarbon generation potential. In this study, hydrous and anhydrous pyrolysis experiments were conducted on black shale core and outcrop samples to evaluate and compare the characteristics and …
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A CFD investigation of cavitation and associated deposit formation in modern diesel fuel injectors
… temperatures within the nozzle, resulting in thermal cracking of the fuel and eventually the formation of carbon deposits. A two-dimensional axisymmetric CFD model with dimensions representative of an injector nozzle was constructed using a fully structured grid.
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High Temperature and High Pressure Determination of the Viscosity and Density of Bitumen as well as the Mutual Solubility of a Bitumen and Water Mixture
… exploitation of these reservoirs that require thermal recovery techniques. Determining these parameters is challenging due to the high temperatures and pressures of these reservoirs. This work utilizes a variable-volume bellows cell with a custom viscometer to measure density and viscosity for …
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Peridynamics For The Solution Of Multiphysics Problems
… field equations for mechanical deformation, thermal diffusion, moisture diffusion, electric potential distribution, porous flow and atomic diffusion in either an uncoupled or a coupled manner. It is a nonlocal theory with an internal length parameter. Therefore, it can capture physical …
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Quantitative evaluation of low-temperature performance of sustainable asphalt mixtures and binders containing recycled asphalt shingles (RAS) and rejuvenators
… temperature to -50°C to estimate the onset of thermal cracking (i.e., the embrittlement temperature). The purpose of this research was to determine the influence of RAS on the low-temperature performance, and to investigate the effectiveness of rejuvenators on restoring any loss in said …
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Local calibration of the MEPDG prediction models for pavement rehabilitation and evaluation of top-down cracking for Oregon Roadways
… HMA overlays are also susceptible to fatigue cracking (alligator cracking and longitudinal cracking), rutting, and thermal cracking. Additional work was therefore needed to calibrate the design process for rehabilitation of existing pavement structures. 38 pavement sections throughout Oregon …
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Verification of asphalt concrete performance prediction using level 2 and level 3 inputs of mechanistic-empirical pavement design guide for flexible pavements of the state of New Jersey
… various distresses, such as rutting, alligator cracking, longitudinal cracking, thermal cracking and International Roughness Index (IRI) were verified for the state of New Jersey. The material properties of older (> 5 years) existing pavement layers were not readily available, which made the …
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Behavior of FRP reinforced and partially prestressed concrete members under the effects of temperature gradients
… experimental investigation into the effects of thermal characteristics of different types of FRP on the development of thermal stresses and on the control of thermal cracking in reinforced concrete (RC) and partially prestressed concrete (PPC) beams. A total of eleven RC and PPC beams using FRP …
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Seismic and gravitational studies of melting in the mantle's thermal boundary layers
… chamber locations with features of the hydrothermal heat extraction system in the upper crust such as microseismicity caused by thermal cracking and high temperature hydrothermal vent systems observed on the seafloor. The third study uses two-dimensional global pseudospectral seismic wave …
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Seismic and gravitational studies of melting in the mantle's thermal boundary layers
… chamber locations with features of the hydrothermal heat extraction system in the upper crust such as microseismicity caused by thermal cracking and high temperature hydrothermal vent systems observed on the seafloor. The third study uses two-dimensional global pseudospectral seismic wave …
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Comparison of conventional and catalytic in-situ combustion processes for oil recovery
… is able to improve the quality of crude oil via thermal cracking in the reservoir. to achieve the required refining and marketing specifications, further upgrading beyond that achievable by thermal cracking is performed by catalytic processing in the reservoir.in this study, four series of …
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Integrated pressure-dependence in automated mechanism generation : a new tool for building gas-phase kinetic models
… and developing technologies, such as pyrolysis, thermal cracking, partial oxidation, and high-efficiency combustion engines, involve complex, gas-phase chemical mechanisms with hundreds of species and thousands of reactions. Building complete, explicit chemical models by-hand for these systems is …
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An acoustic emission-based test to evaluate low temperature behavior of asphalt materials
Low temperature cracking in asphalt pavements located in cold climates is a major cause of pavement deterioration. Accurate evaluation of low temperature cracking behavior of asphalt materials is necessary in order to design pavements that are resistant to thermally induced cracking. Detrimental …
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