Abstract
Thermo-graphical method, Mach-Zehnder interferometer method, temperature-sensitive liquid crystal and so on could be given as representative examples for the visualization method of flowing gas temperature field. In these methods, however, high setup costs and/or hard-to-use operational skills are usually required. Therefore, when it comes to obtaining an approximate gas temperature field simply and quickly, those kinds of methods are not necessarily suitable. To overcome this problem, the authors have proposed a simple visualization method by combining a mesh screen and infrared thermograph, and have examined relation between aperture ratio and apparent emissivity of the mesh screen. In this study, the proposed simple method has been applied to the natural convection around heated vertical plate, and from experimental results, its availability has been shown. To use this method as a simple practical visualization tool, however, the effects of thermal conductivity of the mesh screen, heat transfer between the heated plate surface and the mesh screen on the temperature field, and the installation effect of the mesh screen on the flow field and so on have to be clarified in a quantitative way.
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