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Hydrate film growth at the interface between gaseous CO_2.and sodium chloride solution

Science china Chemistry 2009年第5期52卷 676-682页

作者： peng baozi, sun changyu,{2., yang lanying, zhou wei & pang weixin state key laboratory of heavy Oil {12., china university of petroleum, beijing 102.49, china state key {2. of heavy Oil processing China University of Petroleum Beijing 102249 China

Greenhouse gas CO2.has become a serious problem for human beings. The hydrate technology has been considered as a possible approach to sequester CO2. In this work, the lateral growth rates of a CO2.hydrate film in aqueous NaCl solutions of different concentrations were measured by means of suspending a single gas bubble in liquid. The results show that the film growth rates depended on not only the driving force, but also the NaCl concentration, and the film growth rates decreased with the increasing NaCl concentration. The simple relationship vf ∝ΔT5/2.could be used to correlate the hydrate film growth rate of a CO2.+ NaCl + water system by introducing a NaCl concentration-dependent coefficient. The film thickness was investigated experimentally and evaluated theoretically; the results show that it became thicker at a higher NaCl concentration when the temperature and pressure were specified. In addition, a series of interesting phenomena, such as the occurrence of double hydrate films, were displayed and discussed.

关键词： hydrate interfaces hydrate film growth carbon dioxide sodium chloride

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Experimental investigation on the effective thermal conductivities of different hydrate-bearing sediments

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petroleum Science 2023年第4期20卷 2479-2487页

作者： Xingxun Li Rucheng wei Qingping Li {2. pang Qi Fan guangjin chen changyu sun state key {2. of heavy Oil processing China University of Petroleum-BeijingBeijing102249China state key {2. of Natural Gas Hydrate CNOOC Research Institute Co.Ltd.Beijing100027China

The natural gas hydrate has been regarded as an important future green *** progress on the hydrate exploitation has been made,but some challenges are still *** order to enhance the hydrate exploitation efficiency,a significant understanding of the effective thermal conductivity(ETC)of the hydrate-bearing sediment has become essential,since it directly controls the heat and mass transfer behaviors,and thereby determines the stability of hydrate reservoir and production *** this study,the effective thermal conductivities of various hydrate-bearing sediments were in-situ measured and *** impacts of temperature,particle size and type of sediment were *** effective thermal conductivities of the quartz sand sediments before and after hydrate formation were in-situ *** results show the weak negative correlation of effective thermal conductivity of the quartz sand sediment on the temperature before and after the hydrate *** effective thermal conductivity of the hydrate-bearing sediment decreases with the increase of particle size of the *** dominant effect of the type of porous medium on the characteristics of the effective thermal conductivity of hydrate-bearing sediment was *** results indicate that both the effective thermal conductivities of hydrate-bearing quartz sand sediment and hydrate-bearing silicon carbide sediment are weakly negatively correlated with temperature,but the effective thermal conductivity of hydrate-bearing clay sediment is weakly positively dependent on the *** addition,the values of the effective thermal conductivities of various hydrate-bearing sediments are in the order of hydrate-bearing silicon carbide sediment>hydrate-bearing quartz sand sediment>hydrate-bearing clay *** findings could suggest that the intrinsic thermal conductivity of porous medium could control the characteristics of effective thermal conductivity of hydrate-bearin

关键词： Hydrate Thermal conductivity Sediment Heat transfer In-situ measurement

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Physics perspectives of heavy-ion collisions at very high energy

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Science china(Physics,Mechanics & Astronomy) 2016年第2期59卷 1-27页

作者： Ning-bo Chang ShanShan Cao Bao-yi chen Shi-yong chen Zhen-yu chen Heng-Tong Ding Min He Zhi-quan Liu Long-gang pang Guang-you Qin Ralf Rapp Bjorn Schenke Chun Shen HuiChao Song Hao-jie Xu Qun Wang Xin-Nian Wang Ben-wei Zhang Han-zhong Zhang XiangRong Zhu peng-fei Zhuang key laboratory of Quark and Lepton Physics (MOE) and Institute of Particle Physics Central China Normal University Wuhan 430079 China Nuclear Science Division MS70R0319 Lawrence Berkeley National Laboratory Berkeley 94720 USA Physics Department Tsinghua University Beijing 100084 China Department of Applied Physics Nanjing University of Science and Technology Nanjing 210094 China Cyclotron Institute and Department of Physics and Astronomy Texas A&M University College Station TX 77843 USA Physics Department Brookhaven National Laboratory Upton New York 11973 USA Department of Physics McGill University Montreal Quebec H3A 2T8 Canada Department of Physics and state key {2. of Nuclear Physics and Technology Peking University Beijing 100871 China Department of Modern Physics University of Science and Technology of China Hefei 230026 China

heavy-ion collisions at very high colliding energies are expected to produce a quark-gluon plasma(QGP) at the highest temperature obtainable in a laboratory setting. Experimental studies of these reactions can provide an unprecedented range of information on properties of the QGP at high temperatures. We report theoretical investigations of the physics perspectives of heavy-ion collisions at a future high-energy collider. These include initial parton production, collective expansion of the dense medium, jet quenching,heavy-quark transport, dissociation and regeneration of quarkonia, photon and dilepton production. We illustrate the potential of future experimental studies of the initial particle production and formation of QGP at the highest temperature to provide constraints on properties of strongly interaction matter.

关键词： quark-gluon plasma heavy-ion collisions QCD phase transition properties of QGP

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