当气体在管道中流动时,遇到阀门、孔板等节流元件,由于压力显著降低形成节流现象,需要通过焦耳-汤姆逊系数预测温度的变化。对具有代表性的立方型状态方程,即Re dlich-Kw ong (RK)、 Soave-Re dlich-Kw ong (SRK)、 Pe ng-Robins on (PR...当气体在管道中流动时,遇到阀门、孔板等节流元件,由于压力显著降低形成节流现象,需要通过焦耳-汤姆逊系数预测温度的变化。对具有代表性的立方型状态方程,即Re dlich-Kw ong (RK)、 Soave-Re dlich-Kw ong (SRK)、 Pe ng-Robins on (PR)状态方程,以及多参数状态方程即Be ne dict-We bb-Rubin-Starling (BWRS)状态方程和对比态原理状态方程即Le e-Ke s le r-Plocke r (LKP)状态方程进行了焦耳-汤姆逊系数相关偏导数的推导,并给出了计算过程中涉及到的温度的一阶导数da/d T和Tda/d T公式及其单组分计算公式和多组分的混合规则。由具有代表性的状态方程推导出焦耳-汤姆逊系数公式,便于工程设计计算中使用。展开更多
An expression of the compressibility factor Z > 1 at temperatures near Z0(T0, P0, )is given for pressure gases with constant volume and mass consisting of identical and/ordifferent molecules.The calculated results ...An expression of the compressibility factor Z > 1 at temperatures near Z0(T0, P0, )is given for pressure gases with constant volume and mass consisting of identical and/ordifferent molecules.The calculated results are in satisfactory agreement with those obtainedby Redlich-Kwong equation. The relative error is less than 0.908%展开更多
The experimental solubility of CBZ (Carbobenzoxy) derivatized amino acids namely N-CBZ valine, N-CBZ proline, N-CBZ aspartic acid in supercritical carbon dioxide were correlated by Soave-Red- lich-Kwong Equation state...The experimental solubility of CBZ (Carbobenzoxy) derivatized amino acids namely N-CBZ valine, N-CBZ proline, N-CBZ aspartic acid in supercritical carbon dioxide were correlated by Soave-Red- lich-Kwong Equation state based on fugacity determination and group contribution method using extrapolated critical parameters and mixing rules and other two different empirical models proposed by Yu (1994) and Gordillo-coworkers (1999). The SRK EOS prediction showed very high deviation of % AARD of 9% - 59%. The Yu model had three derivatized amino acids with average absolute deviation from 2.04, 8.17, 10.96, while the Gordillo model had 0.245, 1.067 and 1.144 for CBZ-valine, CBZ-proline and CBZ-aspartic acid successively. The correlated values had better fit with Gordillo model. The predictive capability and applicability for these amino acid derivatives for both the models demonstrated with correlation coefficient around 0.99 for all the experimental solubility observed.展开更多
In this article we state that the compression factor of the Redlich-Kwong Equation Of State （EOS） is smaller than that of van der Waals EOS. The Redlich-Kwong EOS is in better agreement with experimental data on coe...In this article we state that the compression factor of the Redlich-Kwong Equation Of State （EOS） is smaller than that of van der Waals EOS. The Redlich-Kwong EOS is in better agreement with experimental data on coexistence curves at the critical point than the van der Waals EOS. We implement the Redlich-Kwong EOS in the Lattice Boltzmann Method （LBM） simulations via a pseudo-potential approach. We propose a new force, which can obtain computational stationary and reach larger density ratio. As a result, multi-phase flows with large density ratio （up to 1012 in the stationary case） can be simulated. We perform four numerical simulations, which are respectively related to single liquid droplet, vapor-liquid separation, surface tension and liquid coalescence of two droplets.展开更多
Low saline aqueous carbonic fluids are considered to be the ore forming solutions for orogenic lode gold deposits.Phase separation/fluid immiscibility of the ore fluid is quite common and is one of the major reasons f...Low saline aqueous carbonic fluids are considered to be the ore forming solutions for orogenic lode gold deposits.Phase separation/fluid immiscibility of the ore fluid is quite common and is one of the major reasons for deposition of gold in these deposits.Abundant carbonic fluid inclusions have been observed in quartz grains of Hira-Buddnini Gold Deposit.Theoretical estimation indicates that more volume of H2O compared to CO2 is likely to be trapped in inclusions at different P-T conditions.Preferential loss of H2O from fluid inclusions during ductile deformation of quartz grains have been attributed as the suitable reason for abundance of carbonic fluid inclusions.展开更多
文摘当气体在管道中流动时,遇到阀门、孔板等节流元件,由于压力显著降低形成节流现象,需要通过焦耳-汤姆逊系数预测温度的变化。对具有代表性的立方型状态方程,即Re dlich-Kw ong (RK)、 Soave-Re dlich-Kw ong (SRK)、 Pe ng-Robins on (PR)状态方程,以及多参数状态方程即Be ne dict-We bb-Rubin-Starling (BWRS)状态方程和对比态原理状态方程即Le e-Ke s le r-Plocke r (LKP)状态方程进行了焦耳-汤姆逊系数相关偏导数的推导,并给出了计算过程中涉及到的温度的一阶导数da/d T和Tda/d T公式及其单组分计算公式和多组分的混合规则。由具有代表性的状态方程推导出焦耳-汤姆逊系数公式,便于工程设计计算中使用。
文摘An expression of the compressibility factor Z > 1 at temperatures near Z0(T0, P0, )is given for pressure gases with constant volume and mass consisting of identical and/ordifferent molecules.The calculated results are in satisfactory agreement with those obtainedby Redlich-Kwong equation. The relative error is less than 0.908%
文摘The experimental solubility of CBZ (Carbobenzoxy) derivatized amino acids namely N-CBZ valine, N-CBZ proline, N-CBZ aspartic acid in supercritical carbon dioxide were correlated by Soave-Red- lich-Kwong Equation state based on fugacity determination and group contribution method using extrapolated critical parameters and mixing rules and other two different empirical models proposed by Yu (1994) and Gordillo-coworkers (1999). The SRK EOS prediction showed very high deviation of % AARD of 9% - 59%. The Yu model had three derivatized amino acids with average absolute deviation from 2.04, 8.17, 10.96, while the Gordillo model had 0.245, 1.067 and 1.144 for CBZ-valine, CBZ-proline and CBZ-aspartic acid successively. The correlated values had better fit with Gordillo model. The predictive capability and applicability for these amino acid derivatives for both the models demonstrated with correlation coefficient around 0.99 for all the experimental solubility observed.
基金supported by the Ministry of Education in China(Grant No. IRT0844)the Shanghai Science and Technology Commission Project of Excellent Academic Leaders (Grant No.11XD1402300)
文摘In this article we state that the compression factor of the Redlich-Kwong Equation Of State （EOS） is smaller than that of van der Waals EOS. The Redlich-Kwong EOS is in better agreement with experimental data on coexistence curves at the critical point than the van der Waals EOS. We implement the Redlich-Kwong EOS in the Lattice Boltzmann Method （LBM） simulations via a pseudo-potential approach. We propose a new force, which can obtain computational stationary and reach larger density ratio. As a result, multi-phase flows with large density ratio （up to 1012 in the stationary case） can be simulated. We perform four numerical simulations, which are respectively related to single liquid droplet, vapor-liquid separation, surface tension and liquid coalescence of two droplets.
文摘Low saline aqueous carbonic fluids are considered to be the ore forming solutions for orogenic lode gold deposits.Phase separation/fluid immiscibility of the ore fluid is quite common and is one of the major reasons for deposition of gold in these deposits.Abundant carbonic fluid inclusions have been observed in quartz grains of Hira-Buddnini Gold Deposit.Theoretical estimation indicates that more volume of H2O compared to CO2 is likely to be trapped in inclusions at different P-T conditions.Preferential loss of H2O from fluid inclusions during ductile deformation of quartz grains have been attributed as the suitable reason for abundance of carbonic fluid inclusions.
