首页|Energy budget of cold and hot gas-solid fluidized beds through CFD-DEM simulations
Energy budget of cold and hot gas-solid fluidized beds through CFD-DEM simulations
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Direct energy budget is carried out for both cold and hot flow in gas-solid fluidization systems.First,the energy paths are proposed from thermodynamic viewpoints.Energy consumption means total power input to the specific system,and it can be decomposed into energy retention and energy dissipation.Energy retention is the variation of accumulated mechanical energy in the system,and energy dissi-pation is the energy converted to heat by irreversible processes.Then 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 wall.In order to clarify the energy budget,it is important to identify which system is studied:the particle-fluid system or the particle sub-system.For 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 structures.For the hot flow,different heat transfer mecha-nisms are analyzed and the solver is modified to reproduce the experimental results.The impact of the heat transfer mechanisms and heat production on energy consumption is also investigated.The pro-posed budget method has proven to be energy-conservative and easy to conduct,and it is hopeful to be applied to other multiphase flow systems.
Energy budgetGas-solid fluidizationCFD-DEMRegime transitionHeat transfer mechanism
Lei Bi、Yunpeng Jiao、Chunjiang Liu、Jianhua Chen、Wei Ge
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School of Chemical Engineering and Technology,Tianjin University,Tianjin 300072,China
State Key Laboratory of Multiphase Complex Systems,Institute of Process Engineering,Chinese Academy of Sciences,Beijing,100190,China
School of Chemical Engineering,University of Chinese Academy of Sciences,Beijing 100049,China
国家自然科学基金Innovation Academy for Green Manufacture,Chinese Academy of SciencesState Key Laboratory of Multiphase Complex Systems
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