Mass Transfer from CO2 Drops Traveling in High-Pressure and Low-Temperature Water

Mass transfer from CO 2 drops traveling in high-pressure and low-temperature water, simulating the process of CO 2 ocean disposal, was investigated in a water tunnel. This investigation covered cases for CO 2 drops with and without a hydrate shell. In both cases, the CO 2 drops dissolved in water, indicating that the crystal hydrate shell did not stop mass transfer. Influence of the water flow on mass transfer was studied. The drop-shrinkage rate was noticed to increase with increase in the water velocity; and, the rate of mass transfer from CO 2 drops with a hydrate shell was found to be much smaller than that from CO 2 drops without a hydrate shell under the same flow condition. Coefficients for mass transfer from CO 2 drops with and without a hydrate shell were analyzed. In the former case, the mass-transfer coefficient was evaluated on the basis of a series-mass-transfer model; in the latter case, a conventional-type correlation for the mass-transfer coefficient was developed.