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首页> 外文会议>2002 ASME International Mechanical Engineering Congress and Exposition , Nov 17-22, 2002, New Orleans, Louisiana >ISO-GRADIENT LINES IN A DIFFERENTIALLY HEATED CYLINDRICAL FLUID LAYER USING COHERENT GRADIENT SENSING INTERFEROMETER
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ISO-GRADIENT LINES IN A DIFFERENTIALLY HEATED CYLINDRICAL FLUID LAYER USING COHERENT GRADIENT SENSING INTERFEROMETER

机译：使用相干梯度传感干涉仪在不同加热圆柱流体层中的ISO梯度线

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摘要

Non-invasive flow visualization and measurement of temperature fields in convective fluid systems continues to be a challenging problem for researchers. Radiation based measurements such as laser interferometry are one of the few available tool for this purpose. Laser interferometry allows for an accurate and convenient full field visualization and measurement of fluid properties. In the present study a single-beam Coherent Gradient Sensing (CGS) interferometer is used to obtain line-of-sight projections of a three-dimensional temperature field in a convective fluid medium. Due to its inherent insensitivity to vibrations, simple and cost effective optical layout and, most importantly, the absence of a separate reference beam, this interferometer is an ideal choice for measurements in convective fluids. In the present study, line-of-sight interferometric projections of a differentially heated water medium in a cylindrical cavity are presented. The cavity employed has an aspect ratio (diameter/height) of 3.9. The interferograms represent contours of gradient in the temperature field. Each of the interferograms is evaluated to obtain the two-dimensional projection of the temperature field. The temperature field obtained shows the absence of a radial-symmetric pattern at a Rayleigh number of 1.6x10~5.
机译：对流流体系统的非侵入性流动可视化和温度场的测量仍然是研究人员面临的挑战性问题。基于辐射的测量（例如激光干涉测量法）是用于此目的的少数可用工具之一。激光干涉仪可实现准确方便的全场可视化和流体特性测量。在本研究中，单束相干梯度感测（CGS）干涉仪用于获得对流流体介质中三维温度场的视线投影。由于其固有的对振动的敏感性，简单且具有成本效益的光学布局，最重要的是，由于没有单独的参考光束，因此该干涉仪是对流流体测量的理想选择。在本研究中，提出了圆柱形腔体中差异加热的水介质的视线干涉投影。所使用的腔的纵横比（直径/高度）为3.9。干涉图表示温度场中的梯度轮廓。评估每个干涉图以获得温度场的二维投影。所获得的温度场显示在瑞利数为1.6x10〜5时不存在径向对称图案。

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