On the measurement of local vapor concentration around sessile water droplet with high spatiotemporal resolution

doi:10.1016/j.ijmultiphaseflow.2023.104397

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	On the measurement of local vapor concentration around sessile water droplet with high spatiotemporal resolution
	J. J. Wu, H. Zhang, M. P. Hu, Q. Wang, Z. Wang, H. Wang, R. Chen, W. Ren, X. Zhu and Q. Liao
	2023
发表期刊	International Journal of Multiphase Flow
ISSN	0301-9322
卷号	161 页码:8
摘要	Droplet evaporation is a seemingly simple heat and mass transfer process, while of which high-fidelity charac-terization of the vapor field remains a long-standing challenge. In this brief communication, we report the first experimental observation of the local vapor concentration of the sessile water droplet with unprecedently high spatiotemporal resolution. The experimental measurement was enabled by a tailored quartz-enhanced photo-acoustic spectroscopy (QPEAS) system. In this system, a near-infrared, continuous-wave, distributed feedback laser at 1392 nm was utilized to excite the photoacoustic signal of water vapor above the sessile droplet. The photoacoustic signal between the prongs of a tiny quartz tuning fork (QTF) was detected and further interpreted as the vapor concentration information. The feasibility of QEPAS for droplet evaporation characterization was carefully verified. As a demonstration, we measured the time histories of water vapor concentration above the evaporating droplet in both open and closed chambers at the spatial resolution of similar to 30 micrometers and temporal resolution of 0.1 ms. Interestingly, we found the vapor concentration above the evaporating droplet in open ambient featured distinct fluctuations indiscernible to the conventional photography method. Such fluctuation has never been reported before and further corroborated the insufficiency of quasi-steady approximation for droplet evaporation. This work not only extends the application of QEPAS to more complicated physical pro-cesses, but also advances the state of the art in the experimental characterization of sessile water droplet evaporation, which opens up a new possibility to unravel the intricate mechanism of the vapor-mediated droplet motions.
DOI	10.1016/j.ijmultiphaseflow.2023.104397
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收录类别	sci
语种	英语
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文献类型	期刊论文
条目标识符	http://ir.ciomp.ac.cn/handle/181722/68024
专题	中国科学院长春光学精密机械与物理研究所
推荐引用方式 GB/T 7714	J. J. Wu, H. Zhang, M. P. Hu, Q. Wang, Z. Wang, H. Wang, R. Chen, W. Ren, X. Zhu and Q. Liao. On the measurement of local vapor concentration around sessile water droplet with high spatiotemporal resolution[J]. International Journal of Multiphase Flow,2023,161:8.
APA	J. J. Wu, H. Zhang, M. P. Hu, Q. Wang, Z. Wang, H. Wang, R. Chen, W. Ren, X. Zhu and Q. Liao.(2023).On the measurement of local vapor concentration around sessile water droplet with high spatiotemporal resolution.International Journal of Multiphase Flow,161,8.
MLA	J. J. Wu, H. Zhang, M. P. Hu, Q. Wang, Z. Wang, H. Wang, R. Chen, W. Ren, X. Zhu and Q. Liao."On the measurement of local vapor concentration around sessile water droplet with high spatiotemporal resolution".International Journal of Multiphase Flow 161(2023):8.

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