Sequestration of Carbon Dioxide in Deep Portions of Ocean through a Gas-lift Effect

The buoyancy of the bubbles and the decrease in superficial density in the risers generate a gas-lift pumping effect. CO₂ dissolution into seawater is completed in the risers, i.e., seawater including CO₂ is perfectly isolated from the shallow water. Deep ocean sequestration of CO₂ through a gas-lift pump system called Gas Lift Advanced Dissolution system of CO2 (GLAD), are described and discussed on the basis of experimental and computational results done in Research Institute of Green Science and Technology. A gas-liquid two-phase flow takes patterns of bubbly flow, slug flow, froth flow and annular dispersed flow in response to the gas and liquid flow rate. A bubbly flow is the best for the GLAD system. Scaling-up in engineering design needs large-scale structure of the flows. Takayuki Saito et al. carried out a series of researches to reveal the large-scale structure of turbulent bubbly flows.