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首页> 外文会议>Proceedings of the Fourteenth InterSociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems >Enhanced pool-boiling heat transfer and critical heat flux using femtosecond laser surface processing
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Enhanced pool-boiling heat transfer and critical heat flux using femtosecond laser surface processing

机译：飞秒激光表面处理增强了池沸腾传热和临界热通量

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摘要

In this paper, we present the experimental investigation of pool boiling heat transfer on multiscale (microano) functionalized metallic surfaces. The multiscale structures were fabricated via a femtosecond laser surface process (FLSP) technique which forms mound-like microstructures covered by layers of nanoparticles. Using a pool boiling experimental setup with deionized water as the working fluid, both the heat transfer coefficient and critical heat flux were investigated. The polished reference sample was found to have a critical heat flux of 91 W/cm2 at 40 °C of superheat and a maximum heat transfer coefficient of 23,000 W/m2-K. The processed sample was found to have a critical heat flux of 122 W/cm2 at 18 °C superheat and a maximum heat transfer coefficient of 67,400 W/m2-K. Flow visualization revealed nucleate boiling to be the main two-phase heat transfer mechanism. The overall heat transfer performance of the metallic multiscale structured surface has been attributed to both augmented heat transfer surface area and enhanced nucleate boiling regime. On the other hand, increase in the critical heat flux can be attributed to the superhydrophilic nature of the laser processed surface and the presence of nanoparticle layers.
机译：在本文中，我们介绍了多尺度（微/纳米）功能化金属表面上池沸腾传热的实验研究。通过飞秒激光表面工艺（FLSP）技术制造了多尺度结构，该技术形成了被纳米颗粒层覆盖的丘状微结构。使用去离子水作为工作液的池沸腾实验装置，研究了传热系数和临界热通量。发现抛光的参考样品在40°C的过热下的临界热通量为91 W / cm2，最大传热系数为23,000 W / m2-K。发现加工后的样品在18°C的过热下的临界热通量为122 W / cm2，最大传热系数为67,400 W / m2-K。流动可视化显示成核沸腾是主要的两相传热机理。金属多尺度结构化表面的整体传热性能已经归因于增加的传热表面积和增强的核沸腾状态。另一方面，临界热通量的增加可归因于激光加工表面的超亲水性质和纳米颗粒层的存在。

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