EXPERIMENTAL STUDY ON THE PHENOMENA ON THE SINGLE SUCCESSIVE DROPLET IMPACTING HOT COPPER SURFACE

Abstract

The aim of this study is to investigate the detailed phenomena on the droplet impacting the hot surface. The diameter and frequency of droplet is 3.12 mm and 8.5 droplet per second, respectively. The distance between the droplet nozzle and the hot surface is 50 mm. In the present investigation, the temperature copper varies from 110 – 240 ° C. To record the droplet phenomenon, high speed video camera, set at 2000 fps, is utilized. It is combined with the developed image processing technique to obtain the quantitative data such as the spreading diameter of droplet. As a result, a comprehensive characteristic of the droplet impacting hot copper surface is revealed. At the low temperature, the droplet tends to maintain its position in the surfaces to keep the cooling process between the liquid and metal surfaces. As the temperature increases, the bouncing phenomena occurs several times. Next, it is also apparent that the bouncing phenomena first appears at 140 ° C. Finally, this study can provide a new insight of droplet behavior to support further investigation such as heat transfer and internal turbulence analysis.