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Energy

Fuels

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Displaying 51 - 75 of 490

A Shock Tube Study of H Addition to Cyclopentene

February 1, 2018
Author(s)
Jeffrey A. Manion, Iftikhar A. Awan
The kinetics of H atom addition to cyclopentene has been studied with a single pulse shock tube at temperatures of (863 to 1167 K) and pressures of (160 to 370) kPa. Hydrogen atoms were generated with thermal precursors in dilute mixtures of cyclopentene

In situ Angstrom-to-Micrometer Characterization of the Structural and Microstructural Changes in Kaolinite on Heating using Ultra-Small-Angle, Small-Angle, and Wide-Angle X-ray Scattering (USAXS/SAXS/WAXS)

September 26, 2017
Author(s)
Fan Zhang, Andrew J. Allen, Greeshma Gadikota
In this study, synchrotron-based in-operando multi-scale X-ray scattering analyses are used to connect the microstructural changes to the phase changes in kaolinite on heating from 30 °C to 1150 °C. Combined ultra-small-angle and small-angle X-ray

Reference Correlations for the Viscosity and Thermal Conductivity of n-Undecane

September 26, 2017
Author(s)
Marc J. Assael, T.B. Papalas, Marcia L. Huber
This paper presents new wide-ranging correlations for the viscosity and thermal conductivity of n-undecane based on critically evaluated experimental data. The correlations are designed to be used with a recently published equation of state that is valid

Laser-Driven Calorimetry Measurements of Petroleum and Biodiesel Fuels

September 20, 2017
Author(s)
Cary Presser, Ashot Nazarian, Amit Millo
The thermochemical characteristics were determined for several National Institute of Standards and Technology Standard Reference Material petroleum-based and biodiesel fuels, using a novel laser-heating calorimetry technique. Measurements focused on the

APPLICATION OF A MODEL OF HYDROGEN-ASSISTED FATIGUE CRACK GROWTH IN 4130 STEEL

July 31, 2017
Author(s)
Andrew Slifka, Robert L. Amaro, Devin T. O'Connor, Benjamin E. Long, Elizabeth S. Drexler
In this work, we applied a finite element model to predict the cyclic lifetime of 4130 steel cylinders under the influence of hydrogen. This example is used to demonstrate the efficacy of a fatigue crack growth (FCG) model we have developed. The model was

COMPUTATIONAL MODELING OF HYDROGEN-ASSISTED FATIGUE CRACK GROWTH IN PIPELINE STEELS

July 31, 2017
Author(s)
Andrew Slifka, Robert L. Amaro, Elizabeth S. Drexler, Devin T. O'Connor, Benjamin E. Long
In this work we further develop a model to predict hydrogen-assisted fatigue crack growth in steel pipelines and pressure vessels. This implementation of the model is informed by finite element code, which uses an elastic-plastic constitutive model in

Application of the Advanced Distillation Curve Method to the Comparison of Diesel Fuel Oxygenates: 2,5,7,10-Tetraoxaundecane (TOU), 2,4,7,9-Tetraoxadecane (TOD), and Ethanol/Fatty Acid Methyl Ester (FAME) Mixtures

June 22, 2017
Author(s)
Jessica L. Burger, Tara M. Lovestead, Mark LaFollette, Thomas J. Bruno
Although they are amongst the most efficient engine types, compression-ignition engines have difficulties achieving acceptable particulate emission and NOx formation. Indeed, catalytic after-treatment of diesel exhaust has become common and current efforts

Laser-Driven Calorimetry of Single-Component Liquid Hydrocarbons

June 12, 2017
Author(s)
Cary Presser, Ashot Nazarian
A novel laser-heating technique, referred to as the laser-driven thermal reactor (LDTR), was used to determine sample thermal behavior, specific heat release rate, and total specific heat release of three volatile single-component liquid hydrocarbons, i.e

Chamber for Mechanical Testing in H2 with Observation by Neutron Scattering

June 1, 2017
Author(s)
Matthew J. Connolly, Peter E. Bradley, Andrew J. Slifka, Elizabeth S. Drexler
A gas-pressure chamber has been designed, constructed, and tested at a moderate pressure (3.4 MPa, 500 psi) and has the capability of mechanical loading of steel specimens for neutron scattering measurements. The chamber will allow a variety of in situ

Enzyme-Lignin Binding Variation in Commercial Cellulase Preparations Bind Differently to Dioxane Extracted Lignins

May 1, 2017
Author(s)
John M. Yarbrough, Ashutosh Mittal, Elisabeth Mansfield, Larry Taylor, Stephen R. Decker, Michael E. Himmel, Todd B. Vinzant
Commercial fungal cellulases used in biomass-to-biofuels processes can be grouped into three general classes: native, augmented, and engineered. Colorimetric assays for general glycosyl hydrolase activities showed distinct differences in enzyme binding to
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