气固两相撞击流强化传热传质机理研究  

Study of the Mechanism Governing the Intensified Heat and Mass Transfer in a Gas-solid Two-phase Impingement Flow

作　　者：杜敏[1] 周宾[2] 

机构地区：[1]江苏大学能源与动力工程学院,江苏镇江212013 [2]东南大学空间科学与技术研究院,江苏南京210096

出　　处：《热能动力工程》2013年第5期482-486,551-552,共5页Journal of Engineering for Thermal Energy and Power

基　　金：国家自然科学基金资助项目(50976024);江苏大学高级人才专项资助项目(11JDG152)

摘　　要：气固两相撞击流是强化气固相间传递过程的有效手段之一。在自行设计的撞击流实验装置上,以固体颗粒的干燥实验为手段,基于撞击流内的温度变化规律研究了撞击流对传热传质过程的强化机理,并分析了加料方式和喷嘴间距对传热传质过程的影响规律。结果显示,高度湍动的撞击区对热质传递过程有明显的强化作用;撞击流中颗粒向反向气流中的渗透和振荡运动进一步强化了撞击流中的传热传质过程;在相同加料速率条件下,单喷嘴加料与双喷嘴加料对传热传质总体效果(干燥性能)的影响并不明显,喷嘴间距的增大有利于撞击流内热质传递过程的进行。A gas-solid two-phase impingement flow is regarded as one of effective means to intensify the heat and mass transfer process between the gas and solid phase. On a self-designed impingement flow test rig,with the solid particle drying test serving as the test means,the mechanism governing the intensified heat and mass transfer process by an impingement flow was studied on the basis of the temperature variation law inside the impingement flow and the law governing the influence of the material adding mode and spacing between the nozzles on the heat and mass transfer process was also analyzed. The results show that the highly turbulent impingement zone has an obvious intensification role on the heat and mass transfer process and the penetration and oscillation movement of the particles in the impingement flow into the reverse gas flow plays a role to further intensify the heat and mass transfer process in theimpingement flow. Under the condition of a same material adding speed,a single nozzle material addition and dual nozzle material addition have no obvious influence on the overall heat and mass transfer effectiveness( drying performance) and to increase the spacing between nozzles can be favorable to the heat and mass transfer process inside the impingement flow.

关 键 词：气固两相撞击流 传热传质 强化机理 温差 加料方式 喷嘴间距 

分 类 号：TQ021.3[化学工程] TQ021.4