Abstract:
Since the T-mixer is essential for the jet aerator, considerable research and development to increase T-mixer performance were undertaken along with jet aerator development mixing. This thesis aimed to study the mixing behaviors of T-mixer subjected to various effects design on T-mixer performance using Computational Fluid Dynamics (CFD). The cross section area of T-mixer is circle and has 54 millimeter diameter, 1000 millimeter long in main tube and 19 millimeter diameter in branch tube. The mixing efficiency of the flow is considered in terms of mixing parameter (Standard Deviation of air volume) and Dissolved Oxygen (DO). The results show that the mixing parameter and DO increase when the volumetric flow rate ratio of air to that of water is increased. That is because of more volumetric flow rate of air in the T-mixer. Moreover, the depth of the branch tube that is inserted to the main tube is increased, the mixing parameter and DO are also increased but at the branch tube depth of 0.50D and 0.75D this effect is not significant. In the case of the end inlet angle of the branch tube. The results show that mixing parameter and DO increase when the bubble size is small because more momentum transfers between phase. The results reveal that the various angles (0-60 degree) have a small effect on the mixing parameter and DO. The comparison between the simulation data and the experimental data is found that the error is in a range of 2-25 percent. The jet aerator maker can use the results from this investigation as basic information to improve T-mixer for better mixing performance.