The Effect of Twisted Baffle on the Microbubble Generator Swirl Ventury Type

Due to their unique physical properties, microbubbles have received a lot of attention in waste treatment, aquaculture, and food processing. The demand for high-efficient and low-power consumption microbubble generators has become a challenge today. Swirling flow has been widely proven that it can improve bubble formation. Numerous researchers have developed designs to produce swirl flow and strengthen the turbulence fluid flow. In this study, we present a swirl venturi microbubble generator with a 60° twisted baffle fin on the inlet section. The performance of the swirl venturi microbubble generator was investigated experimentally by bubble diameter, hydraulic power (L_w), and bubble-generating efficiency (η_b) parameters. A microbubble generator was placed in the aquarium with 672 L of water. A high-speed video camera was employed to visualize the flow behavior. The water and gas flow rates varied between 40 – 60 lpm and 0.1 – 0.5 lpm, respectively. The data were analyzed by MATLAB R2022b with the technique image processing method. The results show that most bubbles with 100-300 µm were generated. An increased water flow rate (Q_L) will increase the hydraulic power by 5 Watt, while an increase in gas flow rate (Q_G) will only increase 1 Watt. Bubble-generating efficiency decreases as the water flow rate increases. The lowest bubble-generating efficiency of 0.05% occurs at a Q_L 60 lpm and Q_G of 0.1 lpm. Finally is possible to concluded that the swirl-venturi microbubble generator is an efficient method to produce the microbubbles