铅锡合金熔融颗粒风冷相变换热特性实验研究  

Experiment Study on Air-Cooled Phase Change Heat Transfer Characteristics of Sn-Pb Alloy Droplets

作　　者：何先琰 王宏[2,1] 朱恂[2,1] 廖强[2,1] 曹磊[1] 林斌[1] 林林[3] 

机构地区：[1]重庆大学工程热物理研究所,重庆400030 [2]重庆大学低品位能源利用及系统教育部重点实验室,重庆400030 [3]北京科技大学机械工程学院,北京100083

出　　处：《工程热物理学报》2015年第8期1748-1751,共4页Journal of Engineering Thermophysics

基　　金：国家重点基础研究发展计划(973计划)(No.2012CB720403)

摘　　要：熔融颗粒相变冷却过程广泛存在于合金材料制造、高温熔渣余热回收和相变材料的储放热等领域。本文研究了铅锡合金熔融颗粒在沉降过程中的风冷相变换热特性和物相演变之间的关联。结果表明:风速越大、下落高度越高、颗粒直径越小,换热系数越大;风速越大、颗粒直径越小,合金过冷度越大;换热系数和合金过冷度越大时,形成的非稳态组织富锡相含量越高,且组织越细小致密。Phase change cooling process of droplets widely exists in the alloy material,high temperature slag waste heat recovery and heat storage phase change materials,etc.In present study,the air-cooled phase change heat transfer characteristics and the correlation between phase evolution of Sn-Pb Alloy droplets was investigated by falling experiment.The experimental results showed that the heat transfer coefficient increases with increasing the air speed and the falling height,or decreasing the droplet diameter;the degree of undercooling increases with increasing the air speed,or decreasing the droplet diameter;The greater the heat transfer coefficient and the degree of undercoiling of the alloy,the more content of the Sn-phase which is a metastable structure and the more fine and compact microstmcture.

关 键 词：铅锡合金 熔融颗粒 相变冷却 微观结构 

分 类 号：TK121[动力工程及工程热物理—工程热物理]