Characteristics of successive droplets impacting hot aluminum surface around nucleate boiling regime

• Main Authors: Widyatama, Arif, Majid, Akmal Irfan, Wibowo, Teguh, Deendarlianto, Kamal, Samsul
• Format: Conference Proceeding
• Language: English
• Subjects: Algorithms; Aluminum; Cooling effects; Diameters; Droplets; Hot surfaces; Image processing; Industrial development; Metal industry; Nucleate boiling; Object recognition; Spray cooling
• ISSN: 0094-243X; 1551-7616
• DOI: 10.1063/5.0000603

The purpose of this experimental research is to comprehensively investigate the phenomena of successive droplets impacting the aluminum hot surface. It is understood that each region produces different behavior. Therefore, in-depth investigation is necessarily needed. This research will be useful to support the development of metal industry, especially in the spray cooling area. In the present work, Aluminum is used as the material. The surface temperature ranged from 110°C - 240°C, where the regime of onset boiling occurs. The droplet diameter was 2.8 mm. In addition to spreading ratio and apex height, the spreading velocity is also measured by using a specific image processing technique. This sequence algorithm works based on the binary recognition process where the object is marked as the white color, and the black color represents the background. It is supported with high-speed video camera data captured on 4000 fps. As a result, the obtained quantitative data successfully reveals the behavior of the successive droplets and can support the further heat transfer analysis study to achieve the most effective spray cooling condition in the aluminum hot surface.