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Game-theoretical explorations of the mesoscale flow structure and regime transitions in bubble columns

Particuology 2020年第1期18卷 100-108页

作者： Shuo Yuan Yifen Mu Xiaoping Guan Zhixin Liu Jianhua Chen Ning Yang Lin Zhang Key Lab of Systems and Control Institute of Systems SciencesAcademy of Mathematics and Systems ScienceChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China State Key Laboratory of Multiphase Complex Systems Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China

Understanding the mesoscale structure and regime transition in bubble columns is of great significance for reactor design and *** on the energy-minimization multiscale(EMMS)model,a noncooperative game model with constraints is proposed to investigate the structural properties of gas-liquid systems in which small and large bubbles are chosen as players and the energy consumption form the objective *** conservation equations of the system can be regarded as the constraints of the *** the formulated noncooperative game model,the concept of the generalized Nash equilibrium(GNE)is used to characterize the *** algorithm is developed to numerically compute the GNE and some important structural parameters in the *** numerical results show the existence of the GNE for all values of the superficial gas velocity *** Ug varies,the trends in the state variables can be observed and the critical point of Ug *** overall trend of the flow regime transition agrees with the original EMMS model and experimental results,although the GNE calculation also reveals different single-bubble dominant mechanisms with increasing Ug.

关键词： Bubble column Mesoscale regime transition Game theory Generalized Nash equilibrium EMMS model

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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

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A Novel Model for the Prediction of Liquid Film Thickness Distribution in Pipe Gas-Liquid Flows

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Fluid Dynamics & Materials Processing 2024年第9期20卷 1993-2006页

作者： Yubo Wang Yanan Yu Qiming Wang Anxun Liu School of Thermal Engineering Shandong Jianzhu UniversityJinan250101China Shandong Technology Innovation Center of Carbon Neutrality Shandong Jianzhu UniversityJinan250101China Weihai Haihe Technology Co. Ltd.Weihai264200China

A model is proposed for liquid film profile prediction in gas-liquid two-phase flow,which is able to provide the film thickness along the circumferential direction and the pressure gradient in the flow direction.A two-fluid model is used to calculate both gas and liquid phases’flow *** secondary flow occurring in the gas phase is taken into account and a sailing boat mechanism is ***,energy conservation is applied for obtaining the liquid film thickness distribution along the *** film thickness distribution is calculated accordingly for different cases;its values are compared with other models and available experimental *** a result,the newly proposed model is tested and good performances are *** liquid film thickness distribution in small pipes and inclined pipes is also studied,and regime transition is revealed by liquid film profile *** observed inflection point demonstrates that the liquid film thickness decreases steeply along the circumference,when the circle angle ranges between 30°and 50°for gas-liquid stratified flow with small superficial velocities.

关键词： Film thickness secondary flow void fraction pressure gradient regime transition

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Stability-driven Structure Evolution:Exploring the Intrinsic Similarity Between Gas-Solid and Gas-Liquid Systems

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Chinese Journal of Chemical Engineering 2012年第1期20卷 167-177页

作者：陈建华杨宁葛蔚李静海 State Key Laboratory of Multi-Phase Complex Systems Institute of Process EngineeringChinese Academy of Sciences Graduate University of Chinese Academy of Sciences

As the core of the Energy-Minimization Multi-Scale(EMMS) approach,the so-called stability condi-tion has been proposed to reflect the compromise between different dominant mechanisms and believed to be in-dispensable for understanding the complex nature of gas-solid fluidization *** approach was recently ex-tended to the study of gas-liquid bubble *** this article,we try to analyze the intrinsic similarity between gas-solid and gas-liquid systems by using the EMMS ***,the model solution spaces for the two systems are depicted through a unified numerical solution strategy,so that we are able to find three structural hierarchies in the EMMS model for gas-solid *** may help to understand the roles of cluster diameter correlation and stability ***,a common characteristic of gas-solid and gas-liquid systems can be found by comparing the model solutions for the two systems,albeit structural parameters and stability criteria are specific in each system:two local minima of the micro-scale energy dissipation emerges simultaneously in the solution space of structure parameters,reflecting the compromise of two different dominant *** may share an equal value at a critical condition of operating conditions,and the global minimum may shift from one to the other when the oper-ating condition *** a result,structure parameters such as voidage or gas hold-up exhibit a jump change due to this shift,leading to dramatic structure variation and hence regime transition of these *** demonstrates that it is the stability condition that drives the structure variation and system evolution,which may be the intrinsic similarity of gas-solid and gas-liquid systems.

关键词： naulti-scale fluidize-d bed bubble column regime transition stability condition

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改革的转型与突破口选择

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社会主义经济理论与实践 2005年第8期 21-26页

作者：张馨

我国改革已进入攻坚阶段。加快改革转型，进行政治体制改革是关键。要以政府预算制度改革为突破口，推动改革转型取得突破性进展。

关键词：改革体制转型政府预算制度突破口 reform regime transition government budget system breach

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