Determining local values of the heat transfer coefficient on a fin surface

The paper discusses methods of establishing the course of a boiling curve that base on measurements of temperature distribution on a fin surface. Two cases of a local correlation between the heat transfer coefficient and the wall superheat are considered. The first is the case of a smooth copper fin for which the boiling curve is defined using the power-law formula. It is essential to determine, however, how sensitive this method is to measurement errors. In the other case, the local values of the heat transfer coefficient are approximated by means of a power-law polynomial. The method efficiency is studied using the example of a fin surface modified with a laser beam.