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首页> 外文期刊>International Journal of Heat and Mass Transfer >Heat transfer measurements in water using a schlieren technique
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Heat transfer measurements in water using a schlieren technique

机译：使用schlieren技术测量水中的热传递

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摘要

A quantitative schlieren technique has been applied to the study of two-dimensional free convection heat transfer in asymmetrically heated vertical channels, using water as working fluid. As it is well known, the schlieren technique utilizes the refraction of light rays to display a pattern related to the temperature field. The schlieren system employed here makes use of a focal filament filter to identify regions of fluid that deflect light rays by the same amount. The schlieren images recorded enable local heat transfer coefficients to be reconstructed. This optical technique has been extensively used for the measurement of heat transfer coefficients in air, whereas its use in water was limited in the past, and restricted to qualitative observation like flow visualizations. The present paper is seemingly the first to present measurements of the local heat transfer coefficient along the heated wall of a vertical channel using water as working fluid. Experimental results are presented for two values of the channel aspect ratio (0.1 and 0.2) and Rayleigh number values, based on the channel height, of the order of 10~7 (laminar flow regime). Comparisons with numerical and theoretical data (for the isolated isothermal plate limit) are provided.
机译：定量射影技术已被用于研究非对称加热垂直通道中的二维自由对流传热，使用水作为工作流体。众所周知，schlieren技术利用光线的折射来显示与温度场有关的图案。此处使用的schlieren系统利用聚焦细丝滤镜来识别使光线偏转相同量的流体区域。记录的纹影图像使局部传热系数得以重构。该光学技术已广泛用于测量空气中的传热系数，而在过去，它在水中的使用受到限制，并且仅限于定性观察（如流动可视化）。本文件似乎是第一个使用水作为工作流体沿垂直通道的加热壁测量局部传热系数的方法。给出了基于通道高度的两个通道纵横比值（0.1和0.2）和瑞利数值的实验结果，约为10〜7（层流状态）。提供了与数值和理论数据（用于隔离等温板极限）的比较。

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