Multiscale Evaporation Rate Measurement Using Microlaser-Induced Fluorescence
Multiscale Evaporation Rate Measurement Using Microlaser-Induced Fluorescence
复制标题
使用微激光诱导荧光进行多尺度蒸发率测量
DOI：
10.1115/1.4046767
复制
发表时间：
2020
影响因子：
1.6
通讯作者：
Won, Yoonjin
中科院分区：
文献类型：
--
作者：
Suh, Youngjoon;Lin, Cheng-Hui;Gowda, Hamsa;Won, Yoonjin
随着现代高科技电子产品中设备占地面积不断增加，迫切需要开发新的冷却设备来平衡不断增长的电力需求。为了满足这一需求，尖端冷却设备通常采用促进两相热传递的微型结构。然而，由于空间分辨率较低，通过传统的实验方法很难理解微结构如何增强蒸发性能。以前的方法只能对渗透性、导热性和有效表面积等物理特性如何在微观尺度上相互作用以有效散热提供粗略的解释。这促使研究人员开发新方法来观察和分析微观尺度的局部蒸发现象。在此，我们提出了通过使用微激光诱导荧光（μLIF）来表征微观结构的亚微米到宏观蒸发现象的技术。我们通过系统研究温度、浓度和液体厚度对荧光强度的影响，证实了未密封的温度敏感染料的使用。考虑到这些因素，我们使用两种方法分析微观结构的蒸发性能。第一种方法通过测量溶液干燥时间来表征总体和局部蒸发速率。第二种方法采用强度-温度校准曲线将温度敏感荧光信号转换为表面温度，从而计算亚微米级蒸发率。使用这些方法，我们揭示了微结构之间的局部蒸发率很高，但与大的毛细管供给相平衡。这项研究将使工程师能够分解影响微尺度结构蒸发性能的关键热流体参数。
As the heat generation at device footprint continuously increases in modern high-tech electronics, there is an urgent need to develop new cooling devices that balance the increasing power demands. To meet this need, cutting-edge cooling devices often utilize microscale structures that facilitate two-phase heat transfer. However, it has been difficult to understand how microstructures enhance evaporation performances through traditional experimental methods due to low spatial resolution. The previous methods can only provide coarse interpretations on how physical properties such as permeability, thermal conduction, and effective surface areas interact at the microscale to effectively dissipate heat. This motivates researchers to develop new methods to observe and analyze local evaporation phenomena at the microscale. Herein, we present techniques to characterize submicron to macroscale evaporative phenomena of microscale structures by using microlaser-induced fluorescence (μLIF). We corroborate the use of unsealed temperature-sensitive dyes by systematically investigating the effects of temperature, concentration, and liquid thickness on the fluorescence intensity. Considering these factors, we analyze the evaporative performances of microstructures using two approaches. The first approach characterizes the overall and local evaporation rates by measuring the solution drying time. The second approach employs an intensity-to-temperature calibration curve to convert temperature-sensitive fluorescence signals to surface temperatures, which calculates the submicron-level evaporation rates. Using these methods, we reveal that the local evaporation rate between microstructures is high but is balanced with a large capillary-feeding. This study will enable engineers to decompose the key thermofluidic parameters contributing to the evaporative performance of microscale structures.
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影响因子：
2.1
作者：
Greszik, D.;Yang, H.;Schulz, C.
通讯作者：
Schulz, C.
DOI：
--
发表时间：
2008
期刊：
影响因子：
--
作者：
H. Bock;K. Varanasi;P. Chamarthy;T. Deng;A. Kulkarni;B. M. Rush;B. Russ;S. Weaver;F. Gerner
通讯作者：
F. Gerner
高重力环境下微纳结构热接地面的设计与实验验证
DOI：
--
发表时间：
2013
期刊：
影响因子：
--
作者：
D. Bock;Hendrik Jacobus
通讯作者：
Hendrik Jacobus
纳米氧化铁热管热管热性能实验研究
DOI：
--
发表时间：
2011
期刊：
影响因子：
--
作者：
G. Huminic;A. Huminic;I. Morjan;F. Dumitrache
通讯作者：
F. Dumitrache
影响因子：
--
作者：
Bodla, Karthik K.;Weibel, Justin A.;Garimella, Suresh V.
通讯作者：
Garimella, Suresh V.