The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Thomas J. Bruno - One of the best experts on this subject based on the ideXlab platform.
-
Vapor Pressure Measurements by the Gas Saturation Method: The Influence of the Carrier Gas
Journal of Chemical & Engineering Data, 2015Co-Authors: Jason A. Widegren, Mark O. Mclinden, Allan H Harvey, Thomas J. BrunoAbstract:The influence of the carrier Gas on vapor pressure (psat) measurements by the Gas Saturation method was studied. Eicosane (C20H42) was used as the test compound. Helium (He), nitrogen (N2), carbon dioxide (CO2), and sulfur hexafluoride (SF6) were chosen as the carrier Gases. The apparent psat of eicosane was determined repeatedly in each of the four carrier Gases at 323.15 K, and was found to increase with carrier Gas in the order He < N2 < CO2 < SF6. On average, the apparent psat was 26% higher when measured with SF6 than when measured with helium, which shows that the assumption of ideal-Gas behavior for Gas Saturation measurements can lead to large errors.
-
vapor pressure measurements on saturated biodiesel fuel esters by the concatenated Gas Saturation method
Fuel, 2011Co-Authors: Jason A. Widegren, Thomas J. BrunoAbstract:Abstract The purpose of this work was to determine vapor pressures for saturated biodiesel esters at the low-temperature end of their liquid range. A “concatenated” Gas Saturation apparatus capable of simultaneous measurements on 18 samples was used for measurements on methyl palmitate, ethyl palmitate, methyl stearate, ethyl stearate, and eicosane (C20H42) over the temperature range 323.15 K–343.15 K. Eicosane, a linear alkane with a well known vapor pressure curve (in the same range as the biodiesel esters), was included as a control compound. Importantly, the measured vapor pressures for eicosane are in excellent agreement with reference values, which is good evidence of the low uncertainty of the measurements on the biodiesel esters. Over this temperature range, the measured vapor pressure ranges were 0.145 Pa–1.11 Pa for methyl palmitate, 0.0687 Pa–0.616 Pa for ethyl palmitate, 0.0159 Pa–0.183 Pa for methyl stearate, and 0.00704 Pa–0.0912 Pa for ethyl stearate. The combined standard uncertainty in the vapor pressure measurements ranged from 8% to 15%.
-
Gas Saturation vapor pressure measurements of mononitrotoluene isomers from 283 15 to 313 15 k
Journal of Chemical & Engineering Data, 2010Co-Authors: Jason A. Widegren, Thomas J. BrunoAbstract:A Gas Saturation apparatus capable of simultaneous measurements on 18 samples was used for this work. The vapor pressures of 2-nitrotoluene (2-NT), 3-nitrotoluene (3-NT), 4-nitrotoluene (4-NT), and tetradecane (a control compound) were measured with this apparatus over the temperature range (283.15 to 313.15) K. Over this temperature range, the vapor pressure of 2-NT ranged from (5.53 to 61.1) Pa; the vapor pressure of 3-NT ranged from (3.39 to 37.8) Pa; and the vapor pressure of 4-NT ranged from (1.25 to 26.4) Pa. The enthalpies of vaporization or sublimation were determined using the Clausius−Clapeyron equation.
-
vapor pressure measurements on low volatility terpenoid compounds by the concatenated Gas Saturation method
Environmental Science & Technology, 2010Co-Authors: Jason A. Widegren, Thomas J. BrunoAbstract:The atmospheric oxidation of monoterpenes plays a central role in the formation of secondary organic aerosols (SOAs), which have important effects on the weather and climate. However, models of SOA...
-
Concatenated Gas Saturation Vapor Pressure Apparatus
Review of Scientific Instruments, 1997Co-Authors: Thomas J. Bruno, James E. MayrathAbstract:This article presents a Gas Saturation vapor pressure apparatus capable of simultaneous vapor pressure measurements on a total of up to six samples. The apparatus operates at 280–365 K and total pressures of 100–200 kPa. The apparatus features a series of alternating saturators and adsorbers allowing multiple vapor pressure measurements to be made with a single carrier Gas stream. Total carrier Gas flow is derived from mass measurements. The apparatus provides multiple simultaneous vapor pressure measurements for series or families of compounds allowing correlations of physical properties within the families.
Jason A. Widegren - One of the best experts on this subject based on the ideXlab platform.
-
Vapor Pressure Measurements by the Gas Saturation Method: The Influence of the Carrier Gas
Journal of Chemical & Engineering Data, 2015Co-Authors: Jason A. Widegren, Mark O. Mclinden, Allan H Harvey, Thomas J. BrunoAbstract:The influence of the carrier Gas on vapor pressure (psat) measurements by the Gas Saturation method was studied. Eicosane (C20H42) was used as the test compound. Helium (He), nitrogen (N2), carbon dioxide (CO2), and sulfur hexafluoride (SF6) were chosen as the carrier Gases. The apparent psat of eicosane was determined repeatedly in each of the four carrier Gases at 323.15 K, and was found to increase with carrier Gas in the order He < N2 < CO2 < SF6. On average, the apparent psat was 26% higher when measured with SF6 than when measured with helium, which shows that the assumption of ideal-Gas behavior for Gas Saturation measurements can lead to large errors.
-
vapor pressure measurements on saturated biodiesel fuel esters by the concatenated Gas Saturation method
Fuel, 2011Co-Authors: Jason A. Widegren, Thomas J. BrunoAbstract:Abstract The purpose of this work was to determine vapor pressures for saturated biodiesel esters at the low-temperature end of their liquid range. A “concatenated” Gas Saturation apparatus capable of simultaneous measurements on 18 samples was used for measurements on methyl palmitate, ethyl palmitate, methyl stearate, ethyl stearate, and eicosane (C20H42) over the temperature range 323.15 K–343.15 K. Eicosane, a linear alkane with a well known vapor pressure curve (in the same range as the biodiesel esters), was included as a control compound. Importantly, the measured vapor pressures for eicosane are in excellent agreement with reference values, which is good evidence of the low uncertainty of the measurements on the biodiesel esters. Over this temperature range, the measured vapor pressure ranges were 0.145 Pa–1.11 Pa for methyl palmitate, 0.0687 Pa–0.616 Pa for ethyl palmitate, 0.0159 Pa–0.183 Pa for methyl stearate, and 0.00704 Pa–0.0912 Pa for ethyl stearate. The combined standard uncertainty in the vapor pressure measurements ranged from 8% to 15%.
-
Gas Saturation vapor pressure measurements of mononitrotoluene isomers from 283 15 to 313 15 k
Journal of Chemical & Engineering Data, 2010Co-Authors: Jason A. Widegren, Thomas J. BrunoAbstract:A Gas Saturation apparatus capable of simultaneous measurements on 18 samples was used for this work. The vapor pressures of 2-nitrotoluene (2-NT), 3-nitrotoluene (3-NT), 4-nitrotoluene (4-NT), and tetradecane (a control compound) were measured with this apparatus over the temperature range (283.15 to 313.15) K. Over this temperature range, the vapor pressure of 2-NT ranged from (5.53 to 61.1) Pa; the vapor pressure of 3-NT ranged from (3.39 to 37.8) Pa; and the vapor pressure of 4-NT ranged from (1.25 to 26.4) Pa. The enthalpies of vaporization or sublimation were determined using the Clausius−Clapeyron equation.
-
vapor pressure measurements on low volatility terpenoid compounds by the concatenated Gas Saturation method
Environmental Science & Technology, 2010Co-Authors: Jason A. Widegren, Thomas J. BrunoAbstract:The atmospheric oxidation of monoterpenes plays a central role in the formation of secondary organic aerosols (SOAs), which have important effects on the weather and climate. However, models of SOA...
Amin Shokrollahi - One of the best experts on this subject based on the ideXlab platform.
-
applying a robust solution based on expert systems and ga evolutionary algorithm for prognosticating residual Gas Saturation in water drive Gas reservoirs
Journal of Natural Gas Science and Engineering, 2014Co-Authors: Afshin Tatar, Mahmood Reza Yassin, Mohammad Rezaee, Amir Hossein Aghajafari, Amin ShokrollahiAbstract:Abstract In strong water drive Gas reservoirs (WDGRs), the water encroachment in the Gas zone has adverse effects on the Gas mobility and causes considerable volume of Gas to be trapped behind water front; therefore estimation of residual Gas Saturation after water influx is an important parameter in estimation of Gas reservoirs with strong aquifer support. It is difficult to achieve a thorough and exact understanding of water drive Gas reservoirs. It depends on several parameters of petrophysical and operational features. In majority of the previous studies about residual Gas Saturation, the correlations were depended on petrophysical properties such as porosity, permeability, and initial Gas Saturation. Most of these correlations are well applied on limited dataset that they are constructed based on, but they are not applicable to dataset from other references. In other words, they are not capable of generalization. One reason for this might be different experimental methods to determine the residual Gas Saturation. In the present study, the prediction of residual Gas Saturation is presented utilizing Committee Machine Intelligent Technique and some well-known correlations are used for comparison. The reviewed correlations in this study generally do not provide good results and some of them that exhibit reasonable results demand some experimental parameters that are usually unavailable. In this study, two different intelligent models are proposed for spontaneous imbibition and force flood. The suggested models provide good results for the two cases; however, the prediction for force flood is not as exact as the results for the spontaneous imbibition. At the end, an outlier approach detection based on Leverage method was applied to investigate the applicability domain of the proposed models as well as possible outlier data.
Changfa Wang - One of the best experts on this subject based on the ideXlab platform.
-
Experimental study and new three-dimensional kinetic modeling of foamy solution-Gas drive processes
Scientific Reports, 2018Co-Authors: Xiaofei Sun, Zhaoyao Song, Yanyu Zhang, Peng Li, Shilin Wang, Changfa WangAbstract:Foamy solution-Gas drive processes in heavy oil reservoirs are very complex. The influence of some microscopic factors on this process is not fully understood due to limitations of traditional depletion tests. This study aims to investigate foamy solution-Gas drive by experiments and simulations. First, the effects of the pressure depletion rate on critical Gas Saturation and foamy solution-Gas drive processes were investigated by laboratory experiments. Second, a new three-dimensional foamy oil model that captures many important characteristics of foamy solution-Gas drive, such as non-equilibrium behavior, Gas evolution kinetics, and the effect of viscous forces on Gas mobility, was developed. Last, the effects of some important parameters on foamy solution-Gas drive were systematically investigated,and a model application was conducted in a typical foamy oil reservoir. The results indicate that the new model is capble of simulating many of the unusual behaviors observed in foamy solution-Gas drive on a laboratory and field scales. High oil recoveries were obtained with a high oil viscosity, high depletion rate, long sandpack, and low solution Gas-oil ratio. Foamy solution-Gas drive processes are sensitive to the depletion rate, length, and critical Gas Saturation. The oil viscosity, solution GOR and diffusion coefficient are not sensitive factors.
Afshin Tatar - One of the best experts on this subject based on the ideXlab platform.
-
applying a robust solution based on expert systems and ga evolutionary algorithm for prognosticating residual Gas Saturation in water drive Gas reservoirs
Journal of Natural Gas Science and Engineering, 2014Co-Authors: Afshin Tatar, Mahmood Reza Yassin, Mohammad Rezaee, Amir Hossein Aghajafari, Amin ShokrollahiAbstract:Abstract In strong water drive Gas reservoirs (WDGRs), the water encroachment in the Gas zone has adverse effects on the Gas mobility and causes considerable volume of Gas to be trapped behind water front; therefore estimation of residual Gas Saturation after water influx is an important parameter in estimation of Gas reservoirs with strong aquifer support. It is difficult to achieve a thorough and exact understanding of water drive Gas reservoirs. It depends on several parameters of petrophysical and operational features. In majority of the previous studies about residual Gas Saturation, the correlations were depended on petrophysical properties such as porosity, permeability, and initial Gas Saturation. Most of these correlations are well applied on limited dataset that they are constructed based on, but they are not applicable to dataset from other references. In other words, they are not capable of generalization. One reason for this might be different experimental methods to determine the residual Gas Saturation. In the present study, the prediction of residual Gas Saturation is presented utilizing Committee Machine Intelligent Technique and some well-known correlations are used for comparison. The reviewed correlations in this study generally do not provide good results and some of them that exhibit reasonable results demand some experimental parameters that are usually unavailable. In this study, two different intelligent models are proposed for spontaneous imbibition and force flood. The suggested models provide good results for the two cases; however, the prediction for force flood is not as exact as the results for the spontaneous imbibition. At the end, an outlier approach detection based on Leverage method was applied to investigate the applicability domain of the proposed models as well as possible outlier data.
