Study on Transient Film Boiling around Vertical Cylinder with Various Bottom Shapes Investigation of Behavior of Image Feature Points in Vapor Film Aspects and Boiling Aspects Classified by CNN

Abstract

We performed transient film boiling experiments of water under the atmospheric pressure on vertical cylinders with various bottom shapes. We photographed the aspect of the vapor film near the film boiling lower limit point using a high speed video camera, and detected the image feature points. We analysed the observed images with the time, place, number of the feature points, and the vapor film collapsing rate. And in order to examine the start time of the vapor film collapse in line with the boiling characteristics, we newly classified the images into several boiling phases according to the boiling curve.