The Effect of Diameter Downcomer in Air Entrainment Process from Vertical Plunging Water Jet with Downcomer

International Conference on Sustainable Energy and Green Technology 2018

能源学;生态环境科学

Warjito^1 ; Budiarso^1 ; Jaya, Raka Loh^1

Departemen Teknik Mesin, Fakultas Teknik, Universitas Indonesia, Jalan margonda Raya, Depok

16425, Indonesia^1

关键词: Air bubbles;    Air entrainment rate;    Down-comer;    Entrainment process;    Environmentally-friendly technology;    Jet velocities;    Qualitative data;    Water jets;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/268/1/012141/pdf
DOI  :  10.1088/1755-1315/268/1/012141

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

The development of technology for flotation in water-waste treatment is happening rapidly this environmentally friendly technology uses air bubbles to separate the material into hydrophilic or hydrophobic factions as a result of a bubble's characteristics and additional chemicals. Air entrainment events occur when bubble formation takes place. At the time of bubble formation, air entrainment events occur. This study aims to determine the parameters that affect air entrainment; those are the relationship of the downcomer diameter and jet velocity to air entrainment from a fluid mechanics aspect. The apparatuses used in this study were a pump, nozzle, downcomer, flow meter, reducer, and glass water tank; these items were all connected with pipes. Data was collected via a camera to obtain photos and videos. Quantitative and qualitative data was derived from these images using an image processing program; ImageJ. The esults of this research indicate that the diameter of the downcomer affects the volume of the air entrainment, and jet velocity affects air entrainment rate.