Laser texturing of silicon surface to enhance nucleate pool boiling heat transfer
Laser texturing of silicon surface to enhance nucleate pool boiling heat transfer
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DOI：
10.1016/j.applthermaleng.2021.117102
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发表时间：
2021-05-23
影响因子：
6.4
通讯作者：
Surtaev, Anton
中科院分区：
文献类型：
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作者：
Serdyukov, Vladimir;Starinskiy, Sergey;Surtaev, Anton
表面改性是最有前途和讨论的提高沸腾性能的方法之一。迄今为止，改进受热面的技术有很多，但寻找最佳、简单且可靠的技术仍然是一个实际问题。最近，利用激光烧蚀进行表面纹理化已在许多研究中得到应用，这表明其在金属表面池沸腾过程中增强传热和增加临界热通量方面具有巨大潜力。在本文中，我们通过激光纹理化修饰了硅表面，并利用高速热成像和视频记录分析了其对水池沸腾过程中传热和气泡动力学的影响。实验表明，与参考粗糙硅样品相比，使用激光纹理化表面的传热增强高达49.5%，与抛光样品相比高达234%。此外，改性表面具有较低的泡核沸腾起始点和较低的气泡成核温度的特点。使用高速视频记录获得了未经处理和激光纹理表面沸腾期间气泡动力学主要特征的数据集。分析表明，激光处理导致成核位点密度和成核频率显着增加，而气泡离开直径值与参考表面相比显着减小。根据实验数据，对于未处理的表面和激光纹理化的表面，发现并分析了成核频率和离开直径之间的关系。
The surface modification is one of the most promising and discussed methods to improve the boiling performance. To date there are a lot of techniques to modify a heating surface, but the search for the optimal, simple and reliable one is still an actual problem. Recently, the surface texturing using laser ablation was applied in a number of studies, which showed its great potential for heat transfer enhancement and critical heat fluxes increase during pool boiling on the metal surfaces. In this paper, we modified a silicon surface by laser texturing and analyzed its effect on the heat transfer and bubble dynamics during water pool boiling using high-speed thermography and video recording.The experiments showed that the usage of laser-textured surface results in the heat transfer enhancement up to 49.5% compared to the reference rough silicon sample and up to 234% compared to the polished sample. Moreover, the modified surface is characterized with lower onset of nucleate boiling and lower bubble nucleation temperature. Dataset on the major characteristics of bubbles dynamics during boiling on the untreated and laser-textured surfaces was obtained using the high-speed video recording. Its analysis showed that the laser treatment leads to the significant increase in the nucleation site density and nucleation frequency, while the bubble departure diameter value dramatically decreases compared to the reference surface. On the basis of experimental data the relationship between nucleation frequency and departure diameter was found and analyzed both for untreated surface and for laser-textured one.