纳米流体液滴蒸发过程的温度场研究

Analysis of Temperature Field of Nano Fluid Sessile Droplet Evaporation Process

纳米颗粒的加入使得纳米流体具有与基液不同的热物性,被视为潜力巨大的新型工质。而纳米流体的蒸发在电子芯片冷却,农药喷洒,喷墨打印甚至医学诊断上都有着重要的应用意义。本文测量了以载玻片为底板的,三种不同浓度,三种不同粒径的Al_2O_3-H_2O纳米流体液滴在五种不同加热温度下蒸发过程中,液滴体积参数变化;记录气液界面温度。实验结果表明:纳米流体液滴蒸发会使气液界面上产生温度差,中心处温度最低,越靠近边缘温度越高,引发由外向内的马兰格尼流动。

Due to the addition of nanoparticle,nanofluid with different thermal properties from base fluid is viewed as a new high potential working medium And that nanofluid evaporation has a magnitude significance in the cooling of microelectronic chip,pesticide spraying,ink-jet printing,even in the field of medical diagnosis The paper measured volume of Al2O3-H2O nanofluid sessile droplet with three different concentrations,three different sizes in nanoparticle on a glass under five heating temperatures Also,deposit pattern and temperature deposition on the free interface are observed The results showed that:The nanofluid evaporation results in a non-uniform temperature profile along the free interface,being colder on the apex and hotter near the contact line,which leads to marangoni fluxion from outside towards inside