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首页> 外文期刊>International Journal of Heat and Mass Transfer >Volumetric laser heating of nanosuspension microdroplets: Slow evaporation to mid-air explosion
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Volumetric laser heating of nanosuspension microdroplets: Slow evaporation to mid-air explosion

机译：纳米柱的体积激光加热微型电流：缓慢蒸发到中空爆炸

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摘要

Opto-thermal interaction between a laser beam and a nanosuspension droplet is studied in this paper to analyze the thermal response of the droplet at different laser intensities depending on the optical properties of the nanosuspensions. A pulsed Nd:YAC laser beam is used to irradiate four types of droplet, 20 wt% silver nanoparticle suspension, 10wt% and 5wt% germanium nanoparticle suspension and 8mM SDS solution, in an electrospray laser deposition experiment to observe the geometrical changes in their shape. A high-speed camera captured the images of the droplets, showing the decrease in their diameter and inception time for droplet slow evaporation as well as the pre-explosion time and an explosion regime map of four different explosion patterns: shallow, deep, directional and isotropic explosions depending on the laser peak intensity for 20wt% silver nanoparticle suspension microdroplet. The other three types of suspension, however, do not undergo slow evaporation or experience mid-air explosion. A theoretical conduction model has been developed to predict the explosion of the droplet by finding its bubble formation region inside the droplet. These results are corroborated by experiments that the explosion characteristics depend on the optical properties of the suspension such as reflectance, absorption coefficient and refractive index. The temperature distribution and the predicted bubble formation region for the four types of suspension are investigated, and only the silver nanoparticle suspension of 20wt% with low reflectance and high absorption coefficient is predicted to have bubble formation patterns within the droplet, similar to the four explosion patterns in the experiment. The conduction model agrees well with the experimental results and shows that it can predict the threshold laser peak intensity and explosion patterns of a droplet a priori at which explosion occurs.
机译：在本文中研究了激光束和纳米悬液滴之间的光热相互作用，以根据纳米杆子的光学性质分析不同激光强度下液滴的热响应。脉冲Nd：Yac激光束用于在电喷雾激光沉积实验中照射四种类型的液滴，20wt％锗纳米粒子悬浮液，10wt％和5wt％锗纳米粒子悬浮液和8mm SDS溶液，以观察其形状的几何变化。高速摄像机捕获了液滴的图像，显​​示了它们直径和液滴的直径和成立时间的降低，以及四种不同爆炸模式的爆炸时间和爆炸制度图：浅，深，定向和方向各向同性爆炸，取决于20wt％银纳米粒子悬浮液Microdroplet的激光峰强度。然而，其他三种类型的悬浮液不会发生缓慢蒸发或体验中空爆炸。已经开发了理论传导模型以通过在液滴内找到其气泡形成区域来预测液滴的爆炸。通过实验证实了这些结果，即爆炸特性取决于悬浮液的光学性质，例如反射率，吸收系数和折射率。研究了四种悬浮液的温度分布和预测气泡形成区域，并且预计仅具有低反射率和高吸收系数的银纳米粒子悬浮液20wt％，以在液滴内具有气泡形成图案，类似于四个爆炸实验中的模式。传导模型与实验结果一致，并表明它可以预测液滴的阈值激光峰强度和爆炸模式，该液滴发生爆炸的先验。

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