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Experimental analysis of micro-sized particles time-wise adhesion: the influence of impact velocity and surface roughness
International Journal of Heat and Mass Transfer ( IF 5.0 ) Pub Date : 2021-02-01 , DOI: 10.1016/j.ijheatmasstransfer.2020.120632
Alessio Suman , Alessandro Vulpio , Annalisa Fortini , Elettra Fabbri , Nicola Casari , Mattia Merlin , Michele Pinelli

Abstract Micro-sized solid particle adhesion affects several industrial processes and machines. Particle adhesion is responsible for reducing reliability and efficiency. A great example is represented by gas turbines and heat exchangers. These machines collect a huge amount of contaminants during their common operation. These deposits determine operability issues and efficiency losses. In this work, the particle deposition phenomenon and its development over time are studied in-depth through an experimental campaign. A high-speed airflow laden with micro-sized sand particles has impinged onto a flat surface. The particle mass flow, after being carefully dosed by an aerosol generator (contaminant concertation equal to 50 mg/m3), is injected into the main airflow using an aerodynamic eductor. The tests were conducted with different impact velocities ranging from 22 m/s to 48 m/s, and considering different exposure periods. For each test, different roughness levels were tested to define the influence of the surface quality on the particle sticking capability. The deposits amount was evaluated in quantitative and qualitative ways. Weighing measurement was used for extracting quantitative information about particle sticking, while the video and stereomicroscope image analyses were used to gain insight into the morphology of the surface and its modification over the exposure time. The results show a strong dependence of particle sticking on both flow/particle velocity and the roughness of the substrate, characterized by non-linear correlations due to the action of the detachment process.

中文翻译:

微颗粒时间附着力的实验分析:冲击速度和表面粗糙度的影响

摘要 微小尺寸的固体颗粒粘附影响多种工业过程和机器。颗粒粘附是降低可靠性和效率的原因。燃气轮机和热交换器就是一个很好的例子。这些机器在正常运行过程中会收集大量污染物。这些沉积物决定了可操作性问题和效率损失。在这项工作中,通过实验活动深入研究了粒子沉积现象及其随时间的发展。载有微型沙粒的高速气流撞击在平坦的表面上。颗粒质量流在通过气溶胶发生器(污染物浓度等于 50 mg/m3)仔细计量后,使用空气动力喷射器注入主气流中。测试是在 22 m/s 到 48 m/s 的不同冲击速度下进行的,并考虑了不同的暴露时间。对于每个测试,测试不同的粗糙度水平以定义表面质量对颗粒粘附能力的影响。存款金额以定量和定性方式进行评估。称重测量用于提取有关颗粒粘附的定量信息,而视频和立体显微镜图像分析用于深入了解表面的形态及其随暴露时间的变化。结果表明,颗粒粘附对流动/颗粒速度和基材粗糙度有很强的依赖性,由于分离过程的作用,其特征在于非线性相关性。并考虑不同的暴露期。对于每个测试,测试不同的粗糙度水平以定义表面质量对颗粒粘附能力的影响。存款金额以定量和定性方式进行评估。称重测量用于提取有关颗粒粘附的定量信息,而视频和立体显微镜图像分析用于深入了解表面的形态及其随暴露时间的变化。结果表明,颗粒粘附对流动/颗粒速度和基材粗糙度有很强的依赖性,由于分离过程的作用,其特征在于非线性相关性。并考虑不同的暴露期。对于每个测试,测试不同的粗糙度水平以定义表面质量对颗粒粘附能力的影响。存款金额以定量和定性方式进行评估。称重测量用于提取有关颗粒粘附的定量信息,而视频和立体显微镜图像分析用于深入了解表面的形态及其随暴露时间的变化。结果表明,颗粒粘附对流动/颗粒速度和基材粗糙度有很强的依赖性,由于分离过程的作用,其特征在于非线性相关性。测试了不同的粗糙度水平,以确定表面质量对颗粒粘附能力的影响。存款金额以定量和定性方式进行评估。称重测量用于提取有关颗粒粘附的定量信息,而视频和立体显微镜图像分析用于深入了解表面的形态及其随暴露时间的变化。结果表明,颗粒粘附对流动/颗粒速度和基材粗糙度有很强的依赖性,由于分离过程的作用,其特征在于非线性相关性。测试了不同的粗糙度水平,以确定表面质量对颗粒粘附能力的影响。存款金额以定量和定性方式进行评估。称重测量用于提取有关颗粒粘附的定量信息,而视频和立体显微镜图像分析用于深入了解表面的形态及其随暴露时间的变化。结果表明,颗粒粘附对流动/颗粒速度和基材粗糙度有很强的依赖性,由于分离过程的作用,其特征在于非线性相关性。而视频和立体显微镜图像分析用于深入了解表面的形态及其在曝光时间内的变化。结果表明,颗粒粘附对流动/颗粒速度和基材粗糙度有很强的依赖性,由于分离过程的作用,其特征在于非线性相关性。而视频和立体显微镜图像分析用于深入了解表面的形态及其在曝光时间内的变化。结果表明,颗粒粘附对流动/颗粒速度和基材粗糙度有很强的依赖性,由于分离过程的作用,其特征在于非线性相关性。
更新日期:2021-02-01
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