含颗粒液滴蒸发的沉积和内部流动特性  

The Depositions and Internal Flow Characteristics of Drying Droplets Containing Particles

作　　者：孙卓[1] 肖丛杰 周乐平[1] 杜小泽[1] 杨勇平[1] 

机构地区：[1]华北电力大学能源动力与机械工程学院暨电站设备状态监测与控制教育部重点实验室,北京102206

出　　处：《工程热物理学报》2016年第12期2602-2606,共5页Journal of Engineering Thermophysics

基　　金：中央高校基本科研业务费专项资金资助项目(No.2014ZD10;No.JB2015RCJ03);新世纪优秀人才支持计划资助项目(No.NCET-12-0845)

摘　　要：含颗粒液滴蒸发是自然界和工业生产中常见和重要的热质传递现象,其蒸发流动和沉积特性机理尚有待深入揭示。本文直接采用荧光示踪纳米颗粒,研究含颗粒的去离子水液滴在不同颗粒浓度和乙醇浓度条件下的蒸发特性和沉积特性。同时,借助纳米PIV技术获得液滴近壁区尤其是三相接触线附近的速度场。实验结果表明,随颗粒浓度和乙醇浓度的改变,液滴的内部流场发生很大的变化,最终沉积图案也有明显差异。最后,通过初步的理论分析解释了其内部流场和最终沉积变化的原因。The evaporation of droplets containing particles is a common and important heat and mass transfer phenomenon in nature and industrial production.The mechanism of evaporative flow and deposition characteristics remain to be further disclosed.In this paper,the fluorescent tracer nanoparticles are directly used to study the evaporative and deposition characteristics of deionized water droplets containing nanoparticles and ethanol at different concentrations.Meanwhile,the nPIV technique is applied to obtained the velocity field in the near wall region,especially near the three-phase contact line of droplet.It shows that,with the change in particle and ethanol concentrations,the internal flow field of droplets change obviously,and there are significant differences in the final deposition pattern.Finally,an explanation is given for the change of its internal flow field and final deposition.

关 键 词：荧光纳米颗粒 乙醇溶液 液滴 蒸发特性 沉积特性 

分 类 号：O647[理学—物理化学]