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Showing 1 to 20 of 56 for “"n-heptane"”.
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Shock Ignition of N-Heptane With Supplemental Hydrogen
… of adding molecular hydrogen to a mixture of n-heptane (surrogate for diesel fuel) and air on ignition delay time at prototypic post-compression diesel engine conditions. Ignition delay time data was measured using the reflected shock wave technique at a pressure of 20 bar (representative of …
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Crystalline Morphologies of Poly(butadiene)-b-Poly(ethylene oxide) Block Copolymers in n-Heptane
… from selective solvent condition (70°C in n-heptane) via two thermal pathways: (A) by direct immersion into liquid nitrogen, where n-heptane becomes a poor solvent for both blocks at very low temperatures, and (B): by quenching to the crystallization temperature of the PEO, i.e., determined …
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Optical investigation of ethanol and n-heptane dual-fuel partially premixed combution in s reciprocating engine
<p>The details of the dual-fuel combustion of n-heptane and ethanol were investigated in an optically accessible engine representative of light-duty applications. Experimental work involved the application of optical diagnostics such as high-speed imaging of combustion chemiluminescence and soot …
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An Experimental Investigation of JP-7 and n-Heptane Extinction Limits in an Opposed Jet Burner
… limits at one atmosphere for vaporized n-heptane, the Air Force-developed fuels JP-7, and JP-10, as well as methane, ethane, ethylene, propane, butane, and hydrogen. In hypersonic aircraft development it is desirable to design a Scramjet engine that is operated on hydrocarbon fuel, …
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Characterisation of the autoignition delay behaviour of n-heptane in the IQT combustion bomb using CFD modelling
When n-heptane was tested in the IQT device over a range of temperatures and pressures, the measured autoignition delay did not correlate with the chemical autoignition delay associated with a stoichiometric, homogenous mixture as predicted by detailed chemical kinetic models. ... This project …
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Separation of liquid mixtures by membranes.
… membrane has a higher permeation rate of n-heptane and a lower permeation rate of ethyl alcohol than a PES membrane in pervaporation separation of ethyl alcohol/n-heptane mixtures. The second part of this study concerns reverse osmosis of liquid mixtures. A new method to determine the …
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I. Solution Photochemistry of Camphor II. Synthesis and Solution Photochemistry of 2, 2-Dimethylcyclobutanone
… of camphor in solutions of 95% ethanol or n-heptane produces mainly α-campholenic aldehyde. In ethanol a bicyclic acetal is also formed, while in n-heptane a bicyclic enol ether is formed instead of the acetal. Deuterium labelling experiments indicate that the acetal is formed by reaction of …
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Detailed Kinetic Modelling of the Oxidation and Combustion of Large Hydrocarbons Using an Automatic Generation of Mechanisms
… and numerically predicted ignition delays of n-heptane/air and n-decane/air mixtures in high-pressure shock tubes in a wide range of temperatures, pressures and equivalence ratios agree very well. Concentration profiles of the main products and intermediates of n-heptane, iso-octane and n-decane …
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Feasibility studies of the exhaust-gas reforming of hydrocarbon and alcohol fuels
… simulate exhaust-gas reforming reactions for n-heptane and methanol feedstocks. Engine combustion of reformed fuel compositions thus predicted has then been modelled by means of in-house developed cycle analysis software. An important preliminary part of the cycle simulation exercise was the …
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A Machine Learning Model for Octane Number Prediction
… rank highest and the molar composition of n-heptane would have the lowest ranking. For the Multiple Linear Regression (MLR) models, two cases were trained; one with interaction parameters and another without. Both of these cases were trained with and without the composition constraints on the …
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The Effects of Methanol and Isopropanol on the Chiral Separation of Dronabinol and Three Related Impurities: A 3 X 3 X 3 Factorial Design
… containing 1-3% methanol with 1-7% IPA in n-heptane. A factorial design was used to study the main and interaction effects of these alcohols as measured by the retention time, selectivity, and resolution of each pair of enantiomers, as well as the critical pair: (+)-Δ9-THC and (-)-Δ8-THC. …
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Deposition of Metal Oxides and Metal Carbonyls on Silicon Surfaces Using Solution Chemistry
… bonds on the H-Si(111) surface and Co2(CO)8 in n-heptane solution reacted to form a well defined submonolayer coverage of Co(CO)4 above the surface plane of Si(111). Transmission Fourier-transform infrared spectroscopy analysis of (OC) 4Co-Si(111) yielded structural and geometric information about …
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Partial Upgrading of Bitumen Through Combinations of Deasphalting and Visbreaking
… precipitation from mixtures of oil and n-heptane. Neither the VIS-SDA nor the SDA-VIS sequence met the pipeline density specification, but both were able to reduce the diluent requirement to approximately 10 wt% compared with 28 wt% for the feed bitumen. The VIS-SDA sequence offered better …
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Development of a generalised kinetic model for the combustion of hydrocarbon fuels
… have been optimised for three fuels: i-octane, n-heptane and methanol. The ignition delays of the pure fuels were accurately predicted. The temperature-time profiles in the instances of two stage ignition are relatively inaccurate. The temperature profiles are however an improvement on the …
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Ignition study in rapid compression machine
… ignition delay database of toluene/n-heptane mixtures and gasoline/ethanol mixtures was established The data allow us to calculate the auto-ignition behavior in engines. Depending on application the correct choice of alternative fuels may be made.
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Blow-off in gas turbine combustors
… swirling spray flames for two different fuels: n-heptane and n-decane. The measurements include blow-off limits and their att~mpted correlation, visualisation of the blow-off transient with 5 kHz OH* chemiluminescence, and the quantification of the average duration of the blow-off transient. It …
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Microchemical systems for understanding of multiphase flows in upstream hydrocarbon and natural gas productions
… mD were obtained. Temperature (25.0-90.0 °C), n-heptane composition (50.0-80.0 vol%), and n-alkane (n-C_5 to n-C_9) were all observed to influence asphaltenes deposition in the porous media, and reduced dispersion was obtained in the damaged packed-bed by estimating disperision coefficients and …
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Investigating the feasibility of characterising gasoline autoignition using a motored engine apparatus
… the inlet conditions could be adjusted and n-heptane was tested in the device. Fuelling was controlled with an injection system which was calibrated for n-heptane use in the engine. A range of inlet conditions were determined that would enable peak conditions in the engine to result in …
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Autoignition in turbulent two-phase flows
… method to the numerical simulation of several n-heptane sprays igniting at conditions relevant to diesel engine combustion. Droplet-related terms in the CMC equations were closed with the models developed in the first part of the dissertation. For all conditions investigated, CMC could correctly …
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The design of a high pressure solvent extraction process using liquid ammonia as solvent
… Two systems were selected for study, Cumene-n-Heptane-Ammonia and Toluene-Methylcyclohexane-Ammonia. Equlibrium data for the first system was determined experimentally in a specially-designed, equilibrium bomb. A technique was developed to withdraw samples under pressure for analysis by …
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