Stability-driven Structure Evolution

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

Abstract：As the core of the Energy-Minimization Multi-Scale （EMMS） approach, the so-called stability condition has been proposed to reflect the compromise between different dominant mechanisms and believed to be indispensable for understanding the complex nature of gas-solid fluidization systems. This approach was recently extended to the study of gas-liquid bubble columns. In this article, we try to analyze the intrinsic similarity between gas-solid and gas-liquid systems by using the EMMS approach. First, 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 systems. This may help to understand the roles of cluster diameter correlation and stability condition. Second, 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 mechanisms. They 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 operating condition changes. As a result, structure parameters such as voidage or gas hold-up exhibit a jump change dueto this shift, leading to dramatic structure variation and hence regime transition of these systems. This 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. 作者： 陈建华[1]杨宁[2]葛蔚[2]李静海[2] Author： 作者单位： State Key Laboratory of Multi-Phase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China／Graduate University of Chinese Academy of Sciences, Beijing 100049, ChinaState Key Laboratory of Multi-Phase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China 期 刊： 中国化学工程学报：英文版   ISTICEISCI Journal： Chinese Journal of Chemical Engineering 年，卷(期)： 2012, 20(1) 分类号： U463.341 TS733.4 关键词： 气液系统    结构演变    稳定状态    气固系统    相似性    EMMS模型    稳定性条件    驱动    Keywords： naulti-scale    fluidize-d bed    bubble column    regime transition    stability condition    机标分类号： TH1 O3 机标关键词： Structure    stability condition    structure parameters    gas    numerical solution    approach    structural parameters    operating conditions    energy dissipation    different    critical condition    system evolution    EMMS model    global minimum    understanding    two    local minima    correlation    solutions    nature of 基金项目： the National Basic Research Program of China，the Strategic Priority Research Program of the Chinese Academy of Sciences，the International Science.and Technology Cooperation Program

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