Dynamic behaviour of Air Bubbles Generated by a Submerged Micro Hole Diffuser in a Water Purification System
| Main Authors: | Winarto, Felixtianus Eko Wismo, Gilani, Syed Ithtsham Ul-Haq |
|---|---|
| Format: | Proceeding PeerReviewed application/pdf |
| Bahasa: | eng |
| Terbitan: |
, 2008
|
| Subjects: | |
| Online Access: |
https://repository.ugm.ac.id/135880/1/icper2008.pdf https://repository.ugm.ac.id/135880/ |
Daftar Isi:
- Abstract-The upward movement of millimeter size spherical air bubble in a water purification system water column adds undesired turbulence effect and acts as a suspended particle solution stirrer. Size reduction of air bubbles is one of the solutions for minimizing the turbulence effect. At the same time, lifting the suspended particle requires laminar rise-up of the air bubble. An experimental setup is established to study the development of small size air bubbles in a vertical water column of 100 mm W x 100 mm L x 240 mm H. Aluminium discs (3 mm thick) with a pattern of holes with several diameters from 0.1 to 0.4 mm, are used to create millimeter size air bubbles. Porous sintered glass with porosities of 16 to 40 m and 10 to 16 m, are used to produce micro size bubbles. Compressed air at a pressure of 27 kPa is forced through the diffuser (Aluminium disc / sintered glass) at the bottom of the water column. The relationship between diffuser hole diameter and the bubble size is studied and found to be in the ratio of 1:13 respectively. Bubble shape changing along its trajectory shows that oscillation takes place and turbulent flow occurs. Bubble formation starts from compressed air coming out of the diffuser hole and changing its shape from bell to ellipsoid. The paper studied the correlation coefficient between the bubble size and the rise velocity. Strategies for bubble size control and turbulence effects are discussed in detail. Keywords: Micro air bubbles, water purification, micro hole diffuser, dynamic behavior of bubble