Spatiotemporal resolutions in the measurement of heat transfer fluctuations on a thin film formed on a window material via an optical method

Spatiotemporal resolutions in the measurement of heat transfer fluctuations on a thin film formed on a window material via an optical method
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通过光学方法测量窗口材料上形成的薄膜的传热波动的时空分辨率

DOI:
10.1016/j.ijheatmasstransfer.2022.122723
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发表时间:
2022
影响因子:
5.2
通讯作者:
H. Nakamura
H. Nakamura
中科院分区:
工程技术2区
文献类型:
--
作者:
M. Yoshida;H. Nakamura

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通过测量表面温度分布在高时空分辨率的传热现象的调查表明,测量的表面温度的时空衰减恶化的分辨率。因此,重要的是要了解归因于传热表面的热惯性和扩散的温度波动的衰减。在这项研究中,我们解析推导出一般公式,用于预测的时间和空间的温度波动的幅度的传热表面,包括一个薄膜上形成的窗口材料。这些公式是通过制定窗口材料的有效厚度而得出的;它的温度波动幅度与薄膜相同。此外,这些公式允许呈现作为热通量波动幅度、薄膜和窗口材料的热物理性质、薄膜厚度和测量温度分辨率的函数的可测量的时间和空间分辨率的限制。我们总结了预测薄膜温度波动幅度的过程以及时间和空间尺度的可测量限度,以便于推导公式的应用。
The investigation of the heat transfer phenomena at a high spatiotemporal resolution via the measurement of surface temperature distributions indicates that the spatiotemporal attenuation of the measured surface temperature deteriorates the resolution. Therefore, it is important to understand the attenuation of temperature fluctuations attributed to the thermal inertia and diffusion of a heat transfer surface. In this study, we analytically derive general formulae for predicting the amplitude of temporal and spatial temperature fluctuations of a heat transfer surface comprising a thin film formed on a window material. These formulae are derived by formulating the effective thickness of the window material; its temperature fluctuates with the same amplitude as the thin film. Further, these formulae allow presenting the limits of measurable temporal and spatial resolutions as a function of the heat flux fluctuation amplitude, thermophysical properties of the thin film and window material, thin film thickness, and measurement temperature resolution. We summarized the procedure to predict the temperature fluctuation amplitude of the thin film and the measurable limits of the temporal and spatial scales to facilitate the application of the derived formula.
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期刊: Proceeding of Fifth International Symposium on Turbulence and Shear Flow Phenomena
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