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http://dx.doi.org/10.17137/korrae.2017.25.2.27

Effect of Hydraulic Pressure on Bubble Dissolution Rate of Ejector Type Microbubble Generator  

Kim, Hyun-Sik (Department of Civil & Environmental Engineering, Incheon National University)
Lim, Ji-Young (Department of Civil & Environmental Engineering, Incheon National University)
Park, Soo-Young (Department of Civil & Environmental Engineering, Incheon National University)
Kim, Jin-Han (Department of Civil & Environmental Engineering, Incheon National University)
Publication Information
Journal of the Korea Organic Resources Recycling Association / v.25, no.2, 2017 , pp. 27-31 More about this Journal
Abstract
This study was performed to estimate bubble dissolution rate by change of hydraulic pressure according to increase of water depth. Experimental results showed that airflow rate was decreased by increase of hydraulic pressure. Because the force which acts on outlet of nozzle was increased by increase of hydraulic pressure. Mass-transfer coefficient decreased with decreasing airflow rate and increasing effective volume due to increase of hydraulic pressure as water depth increased. On the contrary, as the water depth increased, the bubble dissolution rate was increased because longer residence time of microbubble which was generated by ejector type microbubble generator. However it was thought that if water depth for capacity of ejector type microbubble generator is excessively increasing, bubble dissolution rate would be reduced due to low airflow rate and mass-transfer coefficient. Therefore, it is importance to consider the water depth when operating ejector type microbubble generator.
Keywords
Microbubble; Ejector type microbubble generator; Hydraulic pressure; Venturi nozzle; Breaker disk;
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