Thermal infrared mapping of the freezing phase change activity of micro liquid droplet
Thermal infrared mapping of the freezing phase change activity of micro liquid droplet
复制标题
DOI：
10.1007/s10973-010-0995-2
复制
发表时间：
2010-10-01
影响因子：
4.4
通讯作者：
Liu, J.
中科院分区：
文献类型：
--
作者：
Li, F. F.;Liu, J.
本文致力于发展一种直接观察微液滴整体冻结相变行为的实验方法。提出了一种利用红外热像仪对熔滴凝固过程中的基本现象进行成像并获取其瞬态温度变化的方法。特别是，体积膨胀事件，被认为是冻结的开始，是第一次通过红外图像揭示。初步结果表明，所涉及的温度转变，由于释放的潜热可以准确地表征明显的颜色突变的红外图像。此外，还对纯水、二甲基亚砜（DMSO）和纳米液体制成的三种液滴同时进行实验，以掌握更精确的时间和空间温度分布。讨论了发生凝固的类型和初冻体积。红外监测方法为在微观尺度上检测冷冻相变活动及其温度演化提供了一种简单的方法。
This article is dedicated to develop an experimental approach for directly visualizing the global freezing phase change behavior of micro liquid droplets. The infrared (IR) thermograph was proposed to image the basic solidification phenomena of droplet and to acquire its temperature variations during the transient process. In particular, the volumetric recalescence event, regarded as initiation of freezing, was revealed by IR images for the first time. Preliminary results demonstrated that the involved temperature transition due to release of the latent heat can be accurately characterized by evident color break in IR images. Further, experiments were also performed simultaneously on three kinds of droplets made of pure water, dimethylsulfoxide (DMSO) and nano liquid to grasp more precise temporal and spatial temperature distribution. Types of the occurring solidification and the initial frozen volume produced from the recalescence were generally discussed. The IR monitoring method suggests a straightforward way for detecting the freezing phase change activity and its temperature evolution at micro scale.