Experimental Study on the Separation Performance of Combined Gas-Liquid Separator

In order to evaluate the separation efficiency of each module in this type of novel combined separator, by PDPA(Phase Doppler Particle Analyzer) we find that under different conditions in 6 combinations, combination 6 (including cyclone + stabilizer + blade+ baffler) has the highest separation efficiency, and there are relatively efficiency valley region in all the 6 combinations. Under the same conditions, the average separation efficiency of the baffler is higher than the blade, and then the blade and baffler have their own advantages in different flowrate. To use stabilizer can effectively improve the flow field inside the separator, restrain and reduce vortex and backmixing, more conductive to the gas-liquid separation.

Flow Field and its Flowability in a Stirred Tank with a Plate Propeller

The flow field produced by a plate propeller in a fully baffled flat bottomed cylindrical stirred tank with the diameter of 300 mm was measured using phase doppler particle analyzer. The radial distributions of the time-averaged, fluctuation velocity and turbulent kinetic energy were analyzed. The effects of off-bottom clearance and baffle on the flow field were investigated. The results showed that the fluctuation velocity and turbulent kinetic energy increased with increasing off-bottom clearance in the impeller region; meanwhile, the maximum values of the time-averaged and fluctuation velocity moved to the center of the stirred tank. The maximum axial velocity decreased with increasing off-bottom clearance in the bulk flow. The turbulent kinetic energy was higher in the impeller region. The maximum value of the turbulent kinetic energy increased with increasing off-bottom clearance and occurred near the end of the impeller. The baffle hindered the tangential velocity and exerted strong influence on the turbulent kinetic energy. The flow field in front of the baffle reflected the distribution of the turbulent kinetic energy in the impeller region.

Drop Size and Velocity Measurements in Bio-Oil Sprays Produced by the Flow-Blurring Injector

This study seeks to assess the performance of cold sprays of refined soybean oil produced by the Flow-Blurring (FB) atomization process. A cold diesel spray is also investigated for comparison. Drop size and velocity measurements for different fuels and operating conditions are acquired by a Phase Doppler Particle Analyzer (PDPA). Results show that the pressure drop in the fuel and atomizing airline of the FB injector is independent of the fuel. Radial profiles of Sauter Mean Diameter (SMD) were however affected by the fuel properties. For an Air to Liquid mass Ratio (ALR) of 2.0, the average SMD at an axial plane was about 38 μm for the VO sprays and 34 μm for the diesel spray. Increasing the ALR to 4.0 decreased the SMD in the VO spray to about 32 μm.