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Investigation of mass transfer model of CO_(2) absorption with Rayleigh convection using multi-relaxation time lattice Boltzmann method

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Chinese Journal of Chemical Engineering 2022年第10期50卷 130-142页

作者： Longyun Zheng Kai Guo Hongwei Cai Bo Zhang Hui liu chunjiang liu School of Chemical Engineering and Technology Tianjin UniversityTianjin 300072China State Key Laboratory of Chemical Engineering Tianjin UniversityTianjin 300072Chin

CO_(2) absorption into absorbents is a widely used method to reduce carbon emissions,in which the concentration gradient near the gas-liquid interface may induce Rayleigh convection(RC).Once RC occurs,the mass transfer rate will be significantly ***,it is necessary to explore the mass transfer enhancement mechanism further and develop a penetration/surface divergence hybrid mass transfer *** this study,we conduct research on the process of CO_(2) absorption into ethanol with ***,we use a multi-relaxation time lattice Boltzmann method to simulate the absorption process and obtain the flow and concentration *** we also verify the reliability of the numerical simulation results by comparing with the experimental ***,we analyze the characteristics of non-uniform flow and concentration fields in ***,we divide the near-interface region into diffusion-dominated and convection-dominated mass transfer zones by checking whether the horizontal average velocity is greater than 1.0×10^(-4) m·s^(-1).Furthermore,based on the differences in mass transfer mechanisms of the aforementioned two zones,we propose a penetration/surface divergence hybrid model to predict the instantaneous mass transfer *** prediction results demonstrate that the hybrid model can precisely predict the instantaneous mass transfer coefficient of the entire CO_(2) absorption *** proposed hybrid model provides a promising way to deal with the complex mass transfer problems with non-uniform flow and concentration fields.

关键词： Carbon dioxide Absorption Rayleigh convection Numerical simulation multiple-relaxation-time orgeneralized lattice Boltzmannmodel(MRT-LBM) Mass transfer

Energy budget of cold and hot gas-solid fluidized beds through CFD-DEM simulations

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Particuology 2024年第6期89卷 153-171页

作者： Lei Bi Yunpeng Jiao chunjiang liu Jianhua Chen Wei Ge School of Chemical Engineering and Technology Tianjin UniversityTianjin 300072China State Key Laboratory of Multiphase Complex Systems Institute of Process EngineeringChinese Academy of SciencesBeijing100190China School of Chemical Engineering University of Chinese Academy of SciencesBeijing 100049China

Direct energy budget is carried out for both cold and hot flow in gas–solid fluidization ***,the energy paths are proposed from thermodynamic *** consumption means total power input to the specific system,and it can be decomposed into energy retention and energy *** retention is the variation of accumulated mechanical energy in the system,and energy dissipation is the energy converted to heat by irreversible *** based on the Computational Fluid Dynamics-Discrete Element Method(CFD-DEM)framework,different energy terms are quantified from the specific flow elements of fluid cells and particles as well as their interactions with the *** order to clarify the energy budget,it is important to identify which system is studied:the particle-fluid system or the particle *** the cold flow,the total energy consumption of the particle sub-system can well indicate the onset of bubbling and turbulent,while the variation of local energy consumption terms can reflect the evolution of heterogeneous *** the hot flow,different heat transfer mechanisms are analyzed and the solver is modified to reproduce the experimental *** impact of the heat transfer mechanisms and heat production on energy consumption is also *** proposed budget method has proven to be energy-conservative and easy to conduct,and it is hopeful to be applied to other multiphase flow systems.

关键词： Energy budget Gas-solid fluidization CFD-DEM Regime transition Heat transfer mechanism

Nutrient resorption strategies of three oak tree species in response to interannual climate variability

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Forest Ecosystems 2021年第4期8卷 937-947页

作者： Baoming Du Huawei Ji Shirong liu Hongzhang Kang Shan Yin chunjiang liu School of Agriculture and Biology Shanghai Jiao Tong University200240 ShanghaiChina Key Laboratory of Forest Ecology and Environment China’s State Forestry AdministrationResearch Institute of Forest EcologyEnvironment and ProtectionChinese Academy of Forestry100091 BeijingChina Shanghai Urban Forest Ecosystem Research Station State Forestry Administration200240 ShanghaiChina Shanghai Yangtze River Delta Eco-environmental Change and Management Observation and Research Station Ministry of Science and Technology200240 ShanghaiChina

Background:Nutrient resorption is critical for plants toward balancing their nutritional requirements and adapting to environmental variabilities,which further impacts litter quality and nutrient ***,the interannual variability of nutrient resorption under climate change remains ***:We investigated the five-year nutrient resorption efficiencies(NuRE,%)of 14 elements in three deciduous oak tree species(Quercus aliena ***,***,and ***)in a warm-temperate forest of Central China and assessed their relationships with interannual climate and soil ***:Nutrient resorption did not differ between species but varied significantly between different *** each year,N,P,S,K,C,Mg,and Zn were preferentially resorbed in all of the oak species in contrast to Ca,Na,Mn,Ba,Al,Fe,Cu,which were to some extent *** the 14 elements,the NuRE of C,N,P,S,Ca,and Mg was more sensitive to interannual climate variations in the three oak *** carbon resorption efficiency was significantly increased during the driest year of the study(2014);N resorption efficiency was reduced with temperature;whereas N and P resorption efficiency initially decreased and then increased with ***,the elements with higher NuREs typically had lower coefficient of variation(CV)in all three oak ***:Different oak species exhibited analogous nutrient conservation strategies in response to annual climate variabilities,and interannual climate variations strongly impacted plant nutrient *** plants may establish a tradeoff mechanism to rebalance somatic nutrients for regrowth at the end of the growing season.

关键词： Nutrient resorption Tradeoff mechanism Climate change Quercus spp. Temperate forests

Hydrodynamics and bubble behaviour in a three-phase two-stage internal loop airlift reactor

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Chinese Journal of Chemical Engineering 2018年第6期26卷 1359-1369页

作者： Dan Li Kai Guo Jingnan Li Yiping Huang Junchao Zhou Hui liu chunjiang liu School of Chemical Engineering and Technology Tianjin University Tianjin 300072 China State Key Laboratory of Chemical Engineering Tianjin University Tianjin 300072 China China Construction Industrial & Energy Engineering Co. Ltd. Nanjing210000 China

Local hydrodynamics of a gas–liquid–solid system,such as bubble circulation regime,gas holdup,liquid velocity and axial profile of solid concentration,are studied in a two-stage internal loop airlift *** correlations for gas holdup and liquid velocity are proposed to ease the reactor design and *** bubble circulation regimes were displayed in the first(lower) and second(upper) *** superficial gas velocity and solid loading can promote regime transition of the second stage,and the gas holdup of the second stage is higher than that of the lower *** addition,the effects of solid loading on bubble behaviour are experimentally investigated for each *** is found that bubble size in the downcomer decreases with the presence of solid particles,and bubble size distribution widens under higher superficial gas velocity and lower solid loading.

关键词： Two-stage internal loop airlift reactor Hydrodynamics Bubble Multiphase flow

Geochemical significance of the relative enrichment of pristane and the negative excursion of δ^(13)C_(Pr) across the Permian-Triassic Boundary atMeishan, China

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Chinese Science Bulletin 2005年第19期50卷 2213-2225页

作者： WANG chunjiang liu Yimei liu Hongxiu ZHU Lei SHI Quan Laboratory of Geochemistry and Environmental Sciences Faculty ofGeosciences China University of Petroleum Beijing 102249 China

Changes in the distribution of isoprenoid hy-drocarbons and in δ 13Ckero or δ 13CPr across the section from the Changxing Formation to the lower Yinkeng Formation at Meishan (the GSSP of PTB) are studied, in which a relative enrichment of pristane and a sharp shift in both δ 13Ckero and δ 13Cmole near the boundary are revealed. A possible mecha-nism for the abnormal accumulation of pristane near PTB is suggested: Lipids in some marine animals and their metabo-lites, rich in pristane, can be preserved and accumulate in some suitable depositing facies under certain special condi-tions, such as the catastrophic death of animals and/or de-veloping of an anoxic water column, and thus the pristane enrichment occurs in the sediment. The occurrences of iso-prenoid enrichment and high Pr/Ph ratios have been found in other typical marine anoxic sediments accompanied by mass extinction in various extent during the most important geological periods, such as Late Ordovician, end of Devonian,Early Jurassic and Late Cretaceous. These occurrences sup-port to a certain extent the above mechanism that interprets the genesis of a high Pr/Ph ratio in some typical marine an-oxic sediments. The synchronous sharp negative shifts in δ 13Cmole, δ 13Ckero and δ 13Ccarb from Beds 24 to 26 of the Me-ishan profile indicate that a sudden and strong variation of carbon source in the atmosphere-ocean system occurred during the quick but equable evolution from the end-Permian to Early Triassic, and the coupling between the pristane enrichment and negative shift in δ 13Ckero and δ 13CPr may well indicate the importance of the release of methane hydrates and marine anoxia in the end-Permian mass extinc-tion.

关键词：地球化学碳氢化合物同位素油脂 PTB

Characteristics of carbon storage in Shanghai's urban forest

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Chinese Science Bulletin 2013年第10期58卷 1130-1138页

作者： WANG Zhe CUI Xuan YIN Shan SHEN GuangRong HAN YuJie liu chunjiang School of Agriculture and Biology and Research Center for Low Carbon Agriculture Shanghai Jiao Tong University Department of Art Design Shanghai Jian Qiao College Key Laboratory of Urban Agriculture(South) Ministry of Agriculture Shanghai Forestry Station

Urban forest has undergone rapid development in China over the last three decades because of the acceleration of *** forest thus plays an increasingly important role in carbon sequestration at a regional and national *** one of the most urbanized cities in China,Shanghai showed an increase of forest coverage from 3% in the 1990s to 13% in *** on CITY-green model and the second soil survey of Shanghai,the forest biomass carbon(FBC) was estimated to be 0.48 Tg in the urban area and,forest soil organic carbon(SOC)(0-100 cm soil depth) is 2.48 Tg in the urban and suburban areas,*** values are relatively within the median and lower level compared with other Chinese megacities,with the FBC of 0.02 Tg in Harbin to 47.29 Tg in Chongqing and the forest SOC of 1.74 Tg in Nanjing to 418.67 Tg in *** the different land-use types in Shanghai,the SOC density ranges from 13.8(tidal field) to 38.6 t ha-1(agricultural land).On average,the forest SOC density(31.5 t ha-1) in Shanghai is lower than that in agricultural lands(38.6 t ha-1) and higher than that in lawns(26.5 t ha-1) and gardens(21.3 t ha-1).In Shanghai,the SOC density in newly established urban parks is generally lower than that in older *** the northern and southeastern suburban areas(e.g.,Baoshan,Yangpu,and Nanhui districts),greenspace SOC density is higher than that in the central commercial areas(Hongkou,Putuo,Changning,and Zhabei districts) and in newly developed district(Pudong District).Uncertainties still exist in the estimation of urban forest carbon in Shanghai,as well as in other Chinese ***,future research directions are also discussed in this paper.

关键词：城市森林碳储量上海土壤有机碳密度城市化进程特征土地利用类型城市公园

Carbon sequestration and emissions mitigation in paddy fields based on the DNDC model: A review

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Artificial Intelligence in Agriculture 2020年第1期4卷 140-149页

作者： Shan Yin Xianxian Zhang Junyao Lyu Yuee Zhi Feng Chen Longqin Wang chunjiang liu Sheng Zhou School of Agriculture and Biology Shanghai Jiao Tong University800 Dongchuan Rd.Shanghai 200240China Eco-Environmental Protection Research Institute Shanghai Academy of Agricultural Sciences1000 Jinqi RdShanghai 201403China Shanghai Yangtze River Delta Eco-environmental Change and Management Observation and Research Station Ministry of Education800 Dongchuan RdShanghai 200240China Shanghai Urban Forest Ecosystem Research Station National Forestry and Grassland Administration800 Dongchuan Rd.Shanghai 200240China Key Laboratory for Urban Agriculture Ministry of Agriculture and Rural Affairs800 Dongchuan Rd.Shanghai 200240China Shanghai Engineering Research Centre of Low-carbon Agriculture(SERCLA) 1000 Jinqi RdShanghai 201403China Shanghai Chongming Modern Agricultural Park Management Committee 2 Chongming Beishougeng RdShanghai 202163China Shanghai Songlin Food(Group)CO.LTD 2268 East Rongle RdShanghai 201613China

The DeNitrification–DeComposition(DNDC)model is a process model with a series of carbon and nitrogen biogeochemistry in *** incorporates the driving factors of the ecological environment and aims to simulate the carbon and nitrogen cycle in the terrestrial ***,the model can be applied effectively in a paddy *** on an investigation and literature review,this study summarized and analyzed the impact of agricultural practices such aswatermanagement,fertilizer application,and strawincorporation on greenhouse gas emissions and soil carbon *** years of improvement,the DNDC model can presently be used effectively to evaluate the carbon sequestration and emissions mitigation potential of various agricultural ***,the related details of scientific processes of agricultural management,such as biochar incorporation and plastic mulching in paddy fields,should be added or modified and combined with experimental cases of actual agricultural practices to complete the calibration of the model,provide theoretical support for its promotion,and establish a reliable method of evaluating carbon sequestration and emissions mitigation in paddy fields.

关键词： Soil organic carbon Greenhouse gas emissions Exogenous carbon addition Tillage practices Water and fertilizer management

Visualization of Structured Packing with Laser Induced Fluorescence Technique: Two-Dimensional Measurement of Liquid Concentration Distribution

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Transactions of Tianjin University 2016年第5期22卷 466-472页

作者： liu Botan Shen Yantong Zhang Huishu liu chunjiang Tang Zhongli Yuan Xigang State Key Laboratory of Chemical Engineering School of Chemical Engineering and TechnologyTianjin University Tianjin 300072 China College of Chemical Engineering and Materials Science Tianjin University of Science and TechnologyTianjin 300222 China Tianjin Key Laboratory of Marine Research and Chemistry Tianjin 300222 China

A method of using laser induced fluorescence(LIF)technique was applied to two-dimensional measurement of the liquid concentration distribution in the 250 Y structured packing sheet. The experimental structured packing sheet was made of perspex so that the laser could pass through it. The visualization of the distribution of the liquid concentration in the structured packing sheet was realized. The calibration of the thickness and liquid concentration was carried out firstly and the regression formula I=kcd was acquired, in which concentration c and the liquid film thickness d were both considered. Then the liquid feed of uniform tracer(rhodamine)concentration entered the perspex structured packing from the top under different spraying densities. The corresponding thickness of liquid film on the packing was calculated. Finally, tracer(rhodamine)with a high concentration was injected only at one fixed point of the structured packing under different spraying densities of the liquid. With the known liquid film thickness, the concentration distribution of the tracer can be calculated inside the structured packing sheet.

关键词： LIF visualization structured packing liquid distribution rhodamine

Quorum sensing-based interactions among drugs,microbes,and diseases

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Science China(Life Sciences) 2023年第1期66卷 137-151页

作者： Shengbo Wu Shujuan Yang Manman Wang Nan Song Jie Feng Hao Wu Aidong Yang chunjiang liu Yanni Li Fei Guo Jianjun Qiao School of Chemical Engineering and Technology Tianjin UniversityTianjin 300072China School of Computer Science and Engineering Central South UniversityChangsha 410083China State Key Laboratory of Chemical Engineering Tianjin UniversityTianjin 300072China Collaborative Innovation Center of Chemical Science and Engineering(Tianjin) Tianjin 300072China Key Laboratory of Systems Bioengineering Ministry of Education(Tianjin University)Tianjin 300072China School of Computer Science and Technology College of Intelligence and ComputingTianjin UniversityTianjin 300350China Department of Engineering Science University of OxfordOxford OX13PJUK Institute of Shaoxing Tianjin UniversityShaoxing 312300China

Many diseases and health conditions are closely related to various microbes,which participate in complex interactions with diverse drugs;nonetheless,the detailed targets of such drugs remain to be *** existing studies have reported causal associations among drugs,gut microbes,or diseases,calling for a workflow to reveal their intricate *** this study,we developed a systematic workflow comprising three modules to construct a Quorum Sensing-based Drug-Microbe-Disease(QSDMD)database(http://***/),which includes diverse interactions for more than 8,000 drugs,163 microbes,and 42 common *** interactions between microbes and more than 8,000 drugs have been systematically studied by targeting microbial QS receptors combined with a docking-based virtual screening technique and in vitro experimental ***,we have constructed a QS-based drug-receptor interaction network,proposed a systematic framework including various drug-receptor-microbe-disease connections,and mapped a paradigmatic circular interaction network based on the QS-DMD,which can provide the underlying QS-based mechanisms for the reported causal *** QS-DMD will promote an understanding of personalized medicine and the development of potential therapies for diverse *** work contributes to a paradigm for the construction of a molecule-receptor-microbe-disease interaction network for human health that may form one of the key knowledge maps of precision medicine in the future.

关键词： quorum sensing drugs microbe-disease association microbe-host interaction gut microbiota personalized medicine