农业机械学报2017，Vol.48Issue(10)：272-279,8.DOI:10.6041/j.issn.1000-1298.2017.10.034
柱形生物质和石英砂传热实验与模拟研究
Experiment and Improved Simulation on Heat Transfer for Cylindrical Biomass and Quartz Sand
摘要
Abstract
From the two aspects of experiment and simulation,virtual spherical method was used to improve the numerical simulation of the traditional computational fluid dynamics coupling discrete element method (CFD-DEM).The cylindrical particle was regarded as aggregation of small virtual ball,and particle volume factor concept was also introduced to amend the gas-solid force.The gas force acting on the cylindrical particle was calculated through the calculation between gas phase and virtual sphere.The experimental system of flow and heat transfer was established,and the simulation and comparative analysis were also carried out.The mixing index (MI) of the special binary particles was followed by three stages:rapid increase,slow increase and stable phase.With the increase of superficial gas velocity,the mixing index of particles was increased,and the higher gas velocity was favorable for the mixing of the cylindrical biomass and quartz sand.In the experiment of heat transfer,the temperature of cylindrical biomass particles was generally higher than that of quartz sand.When the superficial gas velocity was small,the fluidization of particles was restricted,and the average temperature difference at different heights of fluidized bed was larger.At large gas velocity,the average temperature difference was not obvious.The fictitious element method was employed to solve the incompatibility of the traditional DEM-CFD model.Compared with the infrared thermal images and the simulation results,they were very close and the improved DEM-CFD method can simulate the flow and heat transfer of cylindrical biomass and quartz sand.关键词
柱形生物质/石英砂/传热/实验/模拟Key words
cylindrical biomass/quartz sand/heat transfer/experiment/simulation分类
能源科技引用本文复制引用
郭飞宏,王泽宇,仲兆平..柱形生物质和石英砂传热实验与模拟研究[J].农业机械学报,2017,48(10):272-279,8.基金项目
国家自然科学基金项目(U13161115、51276040)和东南大学优秀博士学位论文培育基金项目(YBJJ1644) （U13161115、51276040）
