Study on Oblique Grid Shadow Graph

概要

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There are several kinds of optical methods for the measurements of temperature distribution in transparent fluids, such as the Mach-Zehnder interferometer, the Schlieren photo method, the shadow graph method etc.But the Mach-Zender interferometer needs doubled optical paths for reference, and the Schlieren method and the shadow graph have difficulty in getting exact temperature distributions although they can somehow give the maximum value of temperature gradients on the walls.The new method reported herein, which is called the "oblique shadow graph", is a very simple optical technique. It is only to take pictures of an object with a grid of parallel oblique-lines in its behind.The detail of thermal structure of boundary layers, the temperature distributions, and the maximum heat flux at the walls, can be known from the deviations of grid line in the picture taken by this method.In further application, this method can measure mass transfer, measure a temperature distribution of a boundary layer even when pressure changes, and measure boiling heat transfer.
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