Relative Steady State Of Turbulent Gas-Liquid System In A Stirred Vessel

In classical mass transfer theories, the limitation of gas-liquid mass transfer is phase equilibrium, and this limitation can not be affected by fluid turbulence. But there are many phenomena in life such as "spray champagne" show that fluid turbulence may cause deviation of mass transfer limitation from phase equilibrium. This deviation is related to the Reynolds number (Re) of fluid flow. In this article, the limitation of dynamic mass transfer is called relative steady state of turbulent gas-liquid system. This work hopes to study on the relative steady state of turbulent gas-liquid system in a stirred vessel. Then the two flow patterns in a stirred vessel and pipeline is contacted by Re to find a new calculation method of Re in a stirred vessel.Two sets of stirred vessels are designed in this work:a magnetic stirred vessel and a stirred vessel. Experiments in two stirred vessels show that when gas-liquid system of static mass transfer equilibrium begins to flow, the pressure of the system will rise with time until a steady value. This shows that the relative steady state of turbulent gas-liquid system exists in stirred vessels. Strengthening turbulence of the fluid can increase the deviation. At the same rotational speed, the effect of fluid turbulence on the deviation increases with the increase of temperature. Experiments of CO2-H2O system and CO2-10%MDEA system in the magnetic stirred vessel show that the relative steady state exists in different gas-liquid system. This provides a basis for the universality of the theory. Using CO2-H2O system to do experiments under different temperatures (288.15～307.15K) and speeds (190-520rpm) in the stirred vessel. Processing data and then Re can be calculated by the relationship of Re and the deviation ratio. The experimental values are compared with the theoretical values. The experimental values are less than the theoretical values at low temperatures and high rotational speeds. On the contrary, the experimental values are more than the theoretical values at high temperatures and low rotational speeds. The relative size of the two Re values calculated by two methods is not absolute. It will change with temperature and turbulence.