Al2O3纳米流体液滴蒸发特性的数值模拟研究  

Simulation of sessile nanofluid droplet evaporation character

作　　者：金铭 胡定华[1] 李强[1] 范德松[1] JIN Ming;HU Dinghua;LI Qiang;FAN Desong(MIIT Key Laboratory of Thermal Control of Electronic Equipment,Nanjing University of Science and Technology,Nanjing 210094,Jiangsu,China)

机构地区：[1]南京理工大学电子设备热控制工信部重点实验室

出　　处：《化工学报》2019年第11期4199-4206,共8页CIESC Journal

基　　金：国家自然科学基金青年基金项目(51706102);中央高校基本科研业务费专项资金(30917011325)

摘　　要：纳米流体液滴蒸发现象在电子设备冷却、喷墨打印以及医学检测等领域都有广泛应用。为了研究水基Al2O3纳米流体液滴的蒸发特性,建立了纳米流体液滴蒸发的二维瞬态模型,考虑了纳米颗粒输运行为以及液滴内部流动的影响,并采用任意拉格朗日-欧拉法(ALE)捕捉气液运动界面。基于所建立的模型,分析了水基Al2O3纳米流体液滴内部Marangoni流、纳米颗粒初始浓度以及基板温度对纳米流体液滴蒸发特性的影响规律。结果表明,液滴内部Marangoni流会影响气液界面温度分布和蒸发速率。由于液滴内部纳米颗粒浓度分布和气液界面温度发生变化,纳米流体液滴的蒸发速率随着纳米颗粒初始浓度和基板温度升高而增加。Nanofluid droplet evaporation has been widely used in many applications, such as cooling of electronic equipment, inkjet printing and medical testing. To study the evaporation characteristics of water-based Al2O3 nanofluid droplets, a two-dimensional transient model of nanofluid droplet evaporation was established, taking into account the effects of nanoparticle transport and internal droplet flow, and using arbitrary Lagrangian-Euler method(ALE) captures the gas-liquid motion interface. Based on the proposed model, the effects of Marangoni flow,substrate temperature and initial particle concentration on the evaporation of alumina nanofluid droplet were studied. The results showed that the gas-liquid interface temperature distribution and evaporationrate can be affected by Marangoni flow. The evaporation rate increases with the increase of the initial concentration of nanoparticle and the substrate temperature owing to the variation of nanoparticle concentration distribution and interface temperature during droplet evaporation.

关 键 词：纳米流体 氧化铝 蒸发 数值模拟 颗粒浓度 

分 类 号：TQ026.4[化学工程]