单个相变微胶囊在湍流中的运动与融化特性  

Movement and melting characteristics of a MCPCM particle in turbulent flow

作　　者：鲁进利[1] 郝英立[1] 

机构地区：[1]东南大学能源与环境学院洁净煤发电及燃烧技术教育部重点实验室,江苏南京210096

出　　处：《热科学与技术》2007年第4期373-376,共4页Journal of Thermal Science and Technology

基　　金：国家自然科学基金资助项目(50676020);教育部留学回国人员科研启动基金资助项目(6803001005);东南大学科学基金资助项目(9203007013;9203001337)

摘　　要：使用欧拉-拉格朗日方法研究了功能热流体中单个相变微胶囊颗粒在湍流场中的运动和融化特性,获得了相变颗粒在湍流场中运动轨迹以及温度沿轴线分布情况。结果表明,相变颗粒的粒径、密度以及入口位置对其运动和融化特性有较大影响。颗粒较小时跟随性好,但吸收能量能力较小,相变段较短;颗粒较大时跟随性差,但吸收能量能力较大,相变段增长;靠近圆管中心处颗粒温度较低,相变段较长且靠后,靠近壁面处颗粒温度高,相变段较短且靠前。The movement and melting characteristic of a microencapsulated phased-change material （MCPCM） particle in latent functionally thermal fluid were researched using the method of Euler-Lagrange. The movement track and distribution of temperature were obtained. It is shown that the diameter, density and entrance position of phased-change particle has a great effect on the movement and melting characteristics. Small particle has better follow behaviors, but can absorb little energy and the phase-change section is short. Big particle has worse follow behaviors, but can absorb more energy and the phase-change section is long. The temperature of particle close with center of tube is lower and the phase-change section is longer and close to the end. The temperature of particle close with wall is higher and the phase-change section is shorter and close to the entrance.

关 键 词：潜热型功能热流体 相变微胶囊 跟随性 湍流 

分 类 号：TK124[动力工程及工程热物理—工程热物理]