Holographic Interferometric Study of Heat Transfer in Rectangular Cavities

N. G. Patil, C. Prasad, V. Arakeri
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Abstract

Optical techniques like interferometry, shadowgraphy and schlieren photography find common use in investigations1 of fluid flow and heat transfer. The change in refractive index of the fluid caused by temperature and density changes is the basis of these methods. These non-intrusive probes have several advantages over mechanical probes such as, very high spatial and temporal resolution, absence of probe induced perturbations, etc. Mach-Zehnder interferometers are frequently employed for analysing heat transfer in fluids. But the need to maintain nearly identical path length in the two limbs (hence requires two identical cells with optically flat windows, one cell being used for compensation) has limited its application considerably. Holographic interferometry, on the other hand is especially well suited to studies with transparent fluids since there is no need for special windows or cells.
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矩形腔内传热的全息干涉研究
光学技术如干涉测量法、阴影照相法和纹影照相法在流体流动和热传递的研究中得到了普遍的应用。温度和密度变化引起的流体折射率变化是这些方法的基础。与机械探针相比,这些非侵入式探针具有几个优点,如非常高的空间和时间分辨率,没有探针引起的微扰等。Mach-Zehnder干涉仪经常用于分析流体中的传热。但是需要在两个分支中保持几乎相同的路径长度(因此需要两个具有光学平面窗口的相同单元,其中一个用于补偿),这大大限制了其应用。另一方面,全息干涉测量法特别适合透明流体的研究,因为不需要特殊的窗口或细胞。
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