14 results on '"Desheng Huang"'
Search Results
2. Quantification of preferential and mutual mass transfer of gases-light oil systems at high pressures and elevated temperatures by dynamic volume analysis
- Author
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Xiaomeng Dong, Yu Shi, Desheng Huang, and Daoyong Yang
- Subjects
Fluid Flow and Transfer Processes ,Mechanical Engineering ,Condensed Matter Physics - Published
- 2022
3. A robust multiphase isenthalpic flash model for water/solvent/hydrocarbon systems at high pressures and elevated temperatures
- Author
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Desheng Huang and Daoyong Yang
- Subjects
Phase boundary ,Isenthalpic process ,010405 organic chemistry ,General Chemical Engineering ,Enthalpy ,General Physics and Astronomy ,Thermodynamics ,Flash evaporation ,02 engineering and technology ,01 natural sciences ,0104 chemical sciences ,Hydrocarbon mixtures ,chemistry.chemical_compound ,Flash (photography) ,020401 chemical engineering ,chemistry ,Phase (matter) ,0204 chemical engineering ,Physical and Theoretical Chemistry ,Solubility - Abstract
Based on the assumption that only the presence of water and solvent is considered in the aqueous phase, a robust and pragmatic water-associated isenthalpic flash (WAIF) model has been developed to perform multiphase isenthalpic flash calculations for water/solvent/hydrocarbon mixtures at high pressures and elevated temperatures. More specifically, the phase boundary diagram in enthalpy-temperature (H-T) space is constructed first for a given water/solvent/hydrocarbon system at a specified pressure. Then, the phase transition enthalpies and temperatures are determined from the H-T diagram, and thus one-, two-, or three-phase isenthalpic flash calculations can be conducted directly without resorting to stability test for a given system at a specified enthalpy and pressure. In addition, a recursive method has been proposed to initialize the temperature so that the energy conservation equation and material balance equation can be solved simultaneously to overcome the convergence difficulties. The newly proposed isenthalpic flash model has been compared with the water-free isenthalpic flash (WFIF) model and conventional three-phase isenthalpic flash (CTIF) model through three case studies. The WAIF model is found to handle the narrow-boiling constraints effectively and accurately. Furthermore, as for Water/C3H8/C16H34 mixture and Water/CO2/C16H34 mixture, a good agreement is achieved between the WFIF model and the WAIF model as the solubility of solvents (i.e., C3H8 and CO2) in the aqueous phase is quite small. With respect to Water/dimethyl ether (DME)/C16H34 mixture, however, the WAIF model is found to more accurately predict the phase behaviour of water/solvent/hydrocarbon mixtures than the WFIF model since the solubility of DME in the aqueous phase cannot be neglected. The case studies demonstrate that the newly developed water-associated isenthalpic flash model for water/solvent/hydrocarbon systems is robust, efficient, and accurate.
- Published
- 2019
4. A review of autogenous shrinkage models of concrete
- Author
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Desheng Huang, Shengwen Tang, and Zhen He
- Subjects
Materials science ,Mechanics of Materials ,Architecture ,Ultimate tensile strength ,Building and Construction ,Composite material ,Safety, Risk, Reliability and Quality ,Durability ,Civil and Structural Engineering ,Shrinkage - Abstract
For concrete with low water-to-binder ratio, the autogenous shrinkage often takes up most of the total shrinkage. In restrained structures, this kind of shrinkage will produce tensile stress. Once the tensile stress exceeds the tensile strength , it will lead to cracks and seriously endanger the durability of the structure. In this paper, the updated autogenous shrinkage prediction models of concrete in recent years are reviewed in detail. By comparing and analyzing these models, the latest research progress of autogenous shrinkage models is understood, and a direction for the subsequent research of autogenous shrinkage models of concrete is provided. Finally, the problems existing in current autogenous shrinkage models are summarized and prospected.
- Published
- 2021
5. Multiphase boundaries and physical properties of solvents/heavy oil systems under reservoir conditions by use of isenthalpic flash algorithms
- Author
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Desheng Huang, Ruixue Li, and Daoyong Yang
- Subjects
Alkane ,chemistry.chemical_classification ,Equation of state ,Materials science ,Isenthalpic process ,020209 energy ,General Chemical Engineering ,Organic Chemistry ,Enthalpy ,Energy Engineering and Power Technology ,Thermodynamics ,02 engineering and technology ,Solvent ,chemistry.chemical_compound ,Fuel Technology ,020401 chemical engineering ,chemistry ,Phase (matter) ,0202 electrical engineering, electronic engineering, information engineering ,Dimethyl ether ,0204 chemical engineering ,Phase diagram - Abstract
In this paper, the newly developed techniques have been applied to determine multiphase boundaries and physical properties of solvent(s)/heavy oil mixtures at various pressures and temperatures in pressure–temperature (P-T), enthalpy-temperature (H-T), and pressure-enthalpy (P-H) phase diagrams, respectively. Theoretically, the Peng-Robinson equation of state (PR EOS) incorporated with a modified alpha function as well as the previously developed enthalpy calculation algorithm are used to predict the multiphase boundaries of the solvent(s)/heavy oil systems consisting of non-hydrocarbon solvents of CO2 and dimethyl ether (DME) as well as hydrocarbon solvents of C3H8 and n-C4H10. The PR EOS associated with the recently modified alpha function is found to be accurate in reproducing the experimentally measured VL1L2 (V represents the vapour phase, L1 denotes the high density hydrocarbon-rich liquid phase, and L2 refers to the low density CO2 liquid phase) three-phase boundary pressures with an overall absolute average relative deviation (AARD) of 2.01% and a maximum average relative deviation (MARD) of 4.34%, respectively. In addition, the VL1L2 three-phase boundaries are expanded and tended to move toward the region with higher temperatures and lower pressures in the P-T phase diagram with the addition of either C3H8 or n-C4H10 to CO2/heavy oil systems compared to those of only CO2 exists in heavy oil systems. Also, the new theoretical model developed in this study is able to reproduce the experimentally measured VL1 two-phase boundaries of alkane solvents/CO2/heavy oil mixtures as well as DME/heavy oil mixtures with an AARD of 4.52% and 2.88%, respectively. The enthalpy changes rapidly with variation of temperature in both H-T and P-H phase diagrams within the three-phase region.
- Published
- 2021
6. Rising-phase performance evaluation of Expanding-Solvent SAGD: Considering the horizontal-wellbore effect
- Author
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Hao Xiong, Xiang Rao, Desheng Huang, and Hao Liu
- Subjects
Heptane ,Petroleum engineering ,020209 energy ,02 engineering and technology ,Geotechnical Engineering and Engineering Geology ,Pentane ,Solvent ,Overburden ,chemistry.chemical_compound ,Fuel Technology ,020401 chemical engineering ,chemistry ,Asphalt ,Phase (matter) ,0202 electrical engineering, electronic engineering, information engineering ,Oil sands ,Environmental science ,0204 chemical engineering ,Diffusion (business) - Abstract
Expanding-Solvent Steam-Assisted Gravity Drainage (ES-SAGD) is proposed to develop the oil sands more efficiently than conventional SAGD. Even in the rising phase when the steam hasn't reached the overburden, the heat-mass transfer in the wellbore can be one of the reasons for the non-uniform chamber growth of ES-SAGD along the horizontal well. Furthermore, the time and oil production during the rising phase greatly determine the final benefits of the ES-SAGD. In this study, a mathematical method is established to evaluate the performance of ES-SAGD in the rising phase. The calculated results show that: pentane can help increase the oil rate in the rising phase significantly, while the effect of heptane is not quite obvious. Although propane is also a widely used solvent, the oil rate with it is even lower than that of conventional SAGD. The differentials between the cases, which consider the wellbore or not, is different for different solvent-steam co-injections. Specifically, the oil rate differential between the situations considering the wellbore effect or not for propane-SAGD is the highest and is almost twice that of conventional SAGD which has the least differential. Pentane-SAGD has the second-largest differential which is followed by heptane-SAGD. Therefore, for the sake of a more accurate evaluation of ES-SAGD performance in the chamber rising phase, the effects of solvent diffusion into the bitumen and the heat-mass transfer in the wellbore should be comprehensively considered.
- Published
- 2021
7. The development of China’s Yangtze River Economic Belt: how to make it in a green way?
- Author
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Jing Ma, Chuanbo Guo, Jinyue Yan, Shengjun Wu, Wei Xin, Fang Wang, Shuanghu Zhang, Hao Wang, Bai-Lian Li, Junguo Liu, Yushun Chen, Yegang Wu, Yong Wang, Desheng Huang, and Wenjin Liu
- Subjects
Multidisciplinary ,Geography ,010504 meteorology & atmospheric sciences ,business.industry ,Environmental resource management ,Yangtze river ,Climate change ,010501 environmental sciences ,China ,business ,01 natural sciences ,0105 earth and related environmental sciences - Published
- 2017
8. Effect of Different Aging Processes on the Microstructure and Mechanical Properties of a Novel Al–Cu–Li Alloy
- Author
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Yangxun Ou, Hongying Li, Jiaojiao Liu, Desheng Huang, Wei Kang, and Dewang Li
- Subjects
010302 applied physics ,Diffraction ,Materials science ,Polymers and Plastics ,Scanning electron microscope ,Mechanical Engineering ,Metallurgy ,Alloy ,Metals and Alloys ,02 engineering and technology ,engineering.material ,021001 nanoscience & nanotechnology ,Microstructure ,01 natural sciences ,Mechanics of Materials ,Transmission electron microscopy ,0103 physical sciences ,Ultimate tensile strength ,Materials Chemistry ,Ceramics and Composites ,Fracture (geology) ,engineering ,Composite material ,0210 nano-technology - Abstract
The effects of different aging processes on the microstructure and mechanical properties of a novel Al–Cu–Li alloy have been investigated by X-ray diffraction, scanning electron microscopy and transmission electron microscopy. It is found that the tensile properties of a novel Al–Cu–Li alloy are sensitive to aging processes, which correspond to different microstructures. σ (Al5Cu6Mg2) and T1 (Al2CuLi) phases are the major precipitates for the alloy in T6 aging condition (165 °C/60 h). After duplex aging condition (150 °C/24 h + 180 °C/12 h), σ, θ' (Al2Cu) and T1 phases are detected. Only the T1 phases can be found in the T8 state alloy (6% pre-strain+135 °C/60 h). The failure modes of alloy in T6 and duplex aging conditions are dimple-intergranular fracture, while typical quasi-cleavage fracture in T8 condition.
- Published
- 2016
9. Public distrust and valuation biases: Identification and calibration with contingent valuation studies of two air quality improvement programs in China
- Author
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Desheng Huang, Jie He, and Hua Wang
- Subjects
Selection bias ,Economics and Econometrics ,Contingent valuation ,Public economics ,Distrust ,media_common.quotation_subject ,Economic valuation ,Willingness to pay ,Business ,China ,Air quality index ,Finance ,Valuation (finance) ,media_common - Abstract
Economic valuation can be biased by public distrust in local institutions when those institutions are involved in the valuation scenario design, which is often the case for contingent valuation (CV) studies. To better identify and to calibrate the potential biases, we conduct two CV surveys on people's willingness to pay (WTP) for the implementation of new air quality improvement programs at the municipality level in China. A joint selection modeling strategy is developed and employed to identify the potential biases in WTP estimations caused by people's ex-ante distrust in local institutions. The results show the various channels through which the distrust in local institutions affects people's WTP between two cities. For one city, the distrust in local institutions significantly increases the probability of one protesting the new program, which results in an underestimation of WTP by 16%. For the other city, the distrust in local institutions leads to a lower estimation of WTP by 26%, mostly via the determination function.
- Published
- 2020
10. Improved enthalpy prediction of hydrocarbon fractions with a modified alpha function for the Peng-Robinson equation of state
- Author
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Desheng Huang and Daoyong Yang
- Subjects
chemistry.chemical_classification ,Equation of state ,Materials science ,020209 energy ,General Chemical Engineering ,Organic Chemistry ,Relative standard deviation ,Enthalpy ,Energy Engineering and Power Technology ,Thermodynamics ,Alpha function ,02 engineering and technology ,Ideal gas ,Fuel Technology ,Hydrocarbon ,020401 chemical engineering ,chemistry ,0202 electrical engineering, electronic engineering, information engineering ,Range (statistics) ,0204 chemical engineering ,Naphtha - Abstract
In this paper, a pragmatic technique has been developed and validated to predict ideal gas heat capacities and enthalpies for normal alkanes/alkenes as well as hydrocarbon fractions over a wide range of temperatures and pressures. More specifically, an existing correlation has been modified to more accurately determine the ideal gas heat capacities for normal alkanes/alkenes, especially for heavy hydrocarbons. Then, a reliable and convenient enthalpy algorithm for hydrocarbon fractions has been proposed by incorporating a recently modified alpha function into the Peng-Robison equation of state (PR-EOS) together with the newly modified ideal gas heat capacity correlation. As for the new database of ideal gas heat capacities with 340 data points of normal alkanes, the newly modified correlation leads to more accurate predictions, yielding an absolute average relative deviation (AARD) of 1.24% and a maximum absolute relative deviation (MARD) of 6.21% compared with 6.96% and 10.69% from the Kesler and Lee correlation, respectively. To further validate the newly developed correlation, another database of 279 data points of normal alkenes that is excluded for correlation development shows an AARD of 2.04% and a MARD of 2.58% in comparison of 8.44% and 10.57% from the Kesler and Lee correlation, respectively. Also, an algorithm has been proposed to predict the enthalpy with AARDs of 1.25% and 2.78% and MARDs of 2.06% and 3.51% for two representative hydrocarbon fractions (i.e., the light naphtha and Alaska naphtha), respectively.
- Published
- 2019
11. Processing maps and microstructural evolution of isothermal compressed Al–Cu–Li alloy
- Author
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Desheng Huang, Hongying Li, Hao Yin, and Xiongjie Su
- Subjects
Materials science ,Mechanical Engineering ,Alloy ,Metallurgy ,engineering.material ,Strain rate ,Flow stress ,Atmospheric temperature range ,Condensed Matter Physics ,Isothermal process ,law.invention ,Optical microscope ,Mechanics of Materials ,law ,engineering ,Dynamic recrystallization ,General Materials Science ,Deformation (engineering) ,Composite material - Abstract
The hot deformation behavior of an Al–Cu–Li alloy was studied by isothermal compression in the temperature range of 573–773 K with strain rates of 0.01–10 s −1 on a Gleeble-3500 thermo-mechanical simulator. The microstructural evolution during hot deformation was investigated by optical microscope (OM) and transmission electrical microscope (TEM). The results show that the flow stress increases with decreasing deformation temperature and increasing strain rate. Processing maps at the strains of 0.3–0.8 are obtained by isothermal compression data and exhibit two flow instability domains (573–648 K at 0.014–1.5 s −1 and 698–773 K at 0.3–10 s −1 ) and two peak efficiency domains (723–773 K at 0.01–0.1 s −1 and 573–623 K at 0.01–0.03 s −1 ). The strain has a significant effect on the peak efficiencies, and the peak efficiencies increase almost linearly as the strain increases. Dynamic recrystallization takes places at high temperatures (673–773 K) and low strain rates (0.01–0.1 s −1 ). The second phases precipitating dynamically during hot deformation pin dislocations and boundaries of subgrains and restrain the occurrence of dynamic recrystallization, resulting in a higher temperature for dynamic recrystallization. According to the processing maps and microstructural observation, the optimized processing condition of hot deformation for Al–Cu–Li alloy is at 723–773 K and 0.01–0.1 s −1 .
- Published
- 2013
12. Valuing the health risks of particulate air pollution in the Pearl River Delta, China
- Author
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Desheng Huang, Jianhua Xu, and Shiqiu Zhang
- Subjects
Pollution ,education.field_of_study ,Contingent valuation ,media_common.quotation_subject ,Geography, Planning and Development ,Population ,Air pollution ,Management, Monitoring, Policy and Law ,Particulates ,medicine.disease_cause ,Gross domestic product ,Health effect ,Environmental protection ,Environmental health ,medicine ,Environmental science ,education ,China ,media_common - Abstract
The Pearl River Delta (PRD) in Southern China is a region where the manufacturing industry is rapidly developing, accounting for about 10% of the gross domestic product (GDP) with 4% of China's population. The economic development in this region is accompanied by severe air pollution that poses harm to people's health and causes economic loss. This paper estimates the adverse health effects of particulate matter pollution in the PRD by using a log-linear exposure–response function, and monetizes the morbidity effect by using the cost of illness (COI) method and the mortality effects by using both the amended human capital (AHC) method and the results of contingent valuation (CV) study. The results show that in 2006 the total economic loss of the health effects from PM 10 pollution in PRD is 29.21 billion Chinese yuan by using CV results and COI method, which is equivalent to 1.35% of the regional GDP, and is 15.51 billion Chinese yuan by using AHC and COI methods, which is equivalent to 0.72% of the regional GDP. The economic loss due to premature death and chronic respiratory disease accounts for more than 95% of the total loss. Despite the uncertainties, the results clearly show the severity of the health effects and economic loss incurred by particulate matter pollution in PRD; the results further point to the need for developing environmentally friendly industry, and provide a benchmark for comparing alternative options to reduce air pollution.
- Published
- 2012
13. Adsorption of CO2, CH4 and N2 on ordered mesoporous silica molecular sieve
- Author
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Xiuwu Liu, Jingwen Li, Desheng Huang, Yaping Zhou, and Li Zhou
- Subjects
Materials science ,Inorganic chemistry ,General Physics and Astronomy ,chemistry.chemical_element ,Mesoporous silica ,Molecular sieve ,Nitrogen ,Methane ,law.invention ,chemistry.chemical_compound ,Adsorption ,chemistry ,law ,Specific surface area ,Carbon dioxide ,Physical and Theoretical Chemistry ,Crystallization - Abstract
Five samples of ordered mesoporous silica SBA-15 were synthesized. Its pore size was in the range 5–9 nm, and the specific surface area was in the range 500–900 m2/g, which was controlled by the temperature and time of aging on crystallization. Adsorption isotherms of CO2, CH4 and N2 on the samples were collected at 298 K, and the adsorption rates of the gases were also compared for different pressures. It was concluded that SBA-15 with the textural property studied was a good adsorbent for the separation of carbon dioxide from its mixture with methane and nitrogen.
- Published
- 2005
14. Approach to surveillance and consolidation during past 15 years after elimination of schistosomiasis in Shanghai
- Author
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Handing, Pan, primary, Desheng, Huang, additional, and Ketai, Wang, additional
- Published
- 2002
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