Experiments are conducted to measure the oxygen dissolution rate through water surface. Several kinds of a gitation are given into the water basin by paddle rotation or shaking. The velocity field and strength of turbulence are observed using the hot-film anemometer as well as the recovery of the dissolved oxygen concentration by DO meters.
　The Oxygen transfer coefficient KL is found closely realted to the surface mean velocity (U), the strength of turbulence at surface (u',v') and the energy dissipation rate due to turbulence (ε). Plotting the observed data on Log-Log charts, we obtained following relations.
　KL ～ (μ')1.0
　KL ～ (ν')0.4 for rotation.
　KL ～ (ε')0.4 for rotation.
Dut to the interaction between the two kinds of turbulence, shaking superposed on the flow field is found to make KL much larger, especially under the bigger velocity.