Abstract
The main purpose of this study is to improve the performance of surface fusing or globular forming, system of thermoplastic fine particle. First, the flow and thermal characteristics and their relation of high temperature air jet from a pipe nozzle were made clear by measuring the mean and fluctuating velocity and temperature profiles. In order to control the jet diffusion in the radius direction the ring nozzle which has ring-shaped contraction near the nozzle exit was used and its flow and thermal characteristics were made clear. Next, the heat transfer rate of necessary for the globular forming of fine particle was examined and clarified.
