Calculation of local heat transfer coefficient on axisymmetric geometries using different methods of fringe analysis

Calculation of the temperature distribution around axisymmetric geometries such as cylinders and cones and the local heat transfer coefficient on such geometries is often encountered. This problem occurs for example in studies of flow performance in cylindrical channel, temperature distribution around a burner flame and heat transfer from cylindrical tanks. Using a Mach-Zehnder interferometer, interferograms around an isothermal vertical cylinder at three different surface temperatures have been obtained. In this paper, in order to calculate the temperature distributions and the local heat transfer coefficients from interferograms, four methods of interferogram analysis including three classical methods and one transform method have been presented. In order to investigate the accuracy of the methods, results have been compared with the results of the analytical solution and relative accuracy of each method has been obtained. Results show that the transform method, while being less time consuming, is the most accurate method.