Numerical Simulation of Gasoline Blending with Two Different Mixing Systems

2011 ◽  
Vol 317-319 ◽  
pp. 2107-2112
Author(s):  
Song Ying Chen ◽  
Fu Chao Xie ◽  
Jun Jie Mao
Keyword(s):  
Numerical Simulation ◽  
Reynolds Equation ◽  
Mixing Time ◽  
Three Dimensional ◽  
Momentum Equation ◽  
Moving Mesh ◽  
Mixing Models ◽  
Turbulent Model ◽  
Jet Mixing ◽  
Mixing Effects

Based on two different mixing systems: Rotary Jet Mixing (RJM) system and side-entering agitator, two kinds of three-dimensional gasoline components mixing models are established. The incompressible Reynolds equation is selected as the momentum equation and the algorithm of SIMPLE is used to simulate the jet facility. To get the mixing time, moving mesh and the standard k-ε turbulent model has been employed in the multiphase unsteady flow. The results show that the dead areas of RJM are less than side-entering agitator, and the mixing effects are much better. Furthermore, the mixing time of RJM is only 58.2s, which is 69.7% of Side-entering Agitator.

Numerical Simulation of Gasoline Blending in a Cylindrical Tank Agitated by Side-Entering Agitators

2011 ◽  
Vol 354-355 ◽  
pp. 589-593 ◽  
Author(s):  
Song Ying Chen ◽  
Fu Chao Xie ◽  
Jun Jie Mao
Keyword(s):  
Numerical Simulation ◽  
Reynolds Equation ◽  
Mixing Time ◽  
Three Dimensional ◽  
Momentum Equation ◽  
Moving Mesh ◽  
Turbulent Model ◽  
Cylindrical Tank ◽  
Low Velocity ◽  
Central Regions

Side-entering agitators are the main mixing system in the process of petroleum blending. Based on the three-dimensional gasoline components mixing model, the incompressible Reynolds equation is selected as the momentum equation and the algorithm of SIMPLE is employed to simulate the flow field of three side-entering agitators. In the unsteady multiphase flow, moving mesh and the standard k-ε turbulent model has been employed to get the mixing time. The results show that the model of side-entering agitators exists low-velocity zones, which are like structures of vortex in the central regions of blending tank, and the mixing time is 33.7s.

scholarly journals Numerical Simulation of Temperature Decrease in Greenhouses with Summer Water-Sprinkling Roof

Energies ◽  
2019 ◽  
Vol 12 (12) ◽  
pp. 2435 ◽  
Author(s):  
Jiaming Guo ◽  
Yanhua Liu ◽  
Enli Lü
Keyword(s):  
Numerical Simulation ◽  
Three Dimensional ◽  
Simple Algorithm ◽  
Discrete Ordinates ◽  
Multiphase Model ◽  
Temperature Decrease ◽  
Turbulent Model ◽  
Flow Rates ◽  
Symmetrical Model ◽  
Simulation Results

Decreasing the temperature of a greenhouse in summer is very important for the growth of plants. To investigate the effects of a roof sprinkler on the heat environment of a greenhouse, a three-dimensional symmetrical model was built, in which a k-ε (k-epsilon) turbulent model, a DO (Discrete Ordinates) irrational model, a Semi-Implicit Method for Pressure-Linked Equations (SIMPLE) algorithm, and a multiphase model were used to simulate the effects of the roof sprinkler, at different flow rates. Based on the simulation results, it was found that the temperature could be further reduced under a proper sprinkle rate, and the temperature distribution in the film on the roof was more uniform. A test was conducted to verify the accuracy of the model, which proved the validity of the numerical results. The simulation results of this study will be helpful for controlling and optimizing the heat environment of a greenhouse.

Numerical Simulation and Experimental Study on Hydraulic Performance of Centrifugal Pump's Impeller Based on FINE

2013 ◽  
Vol 444-445 ◽  
pp. 390-394
Author(s):  
Yong Shang ◽  
Xiao Bing Liu ◽  
Xue Jun Yu
Keyword(s):  
Numerical Simulation ◽  
Centrifugal Pump ◽  
Flow Rate ◽  
Flow Analysis ◽  
Three Dimensional ◽  
Hydraulic Performance ◽  
Test Results ◽  
Turbulent Model ◽  
Three Dimensional Flow ◽  
Dimensional Flow

By using the FINE software developed by NUMECA Company, the hydraulic performance of the impeller of a centrifugal pump with spatial guide vanes was numerically simulated. The S-A turbulent model was used to numerically calculate the three-dimensional flow field in the centrifugal pump under three different conditions. The flow analysis shows that the pressure gradient on the vane surface gradually reduces with the increasing of the flow rate; the position of axial vortex between vanes has nothing to do with the flow rate; the tangential flow gradient in the flow passage decreases with the increasing of the flow rate. Compared with the test results, it is obvious that this numerical simulation can accurately predicate the complicated three-dimensional flow and the hydraulic performance of the pump.

scholarly journals Blowing and drifting snow in Alpine terrain: numerical simulation and related field measurements

1998 ◽  
Vol 26 ◽  
pp. 174-178 ◽  
Author(s):  
Peter Gauer
Keyword(s):  
Numerical Simulation ◽  
Numerical Model ◽  
Three Dimensional ◽  
Field Measurements ◽  
Blowing Snow ◽  
Related Field ◽  
Drifting Snow ◽  
Physically Based ◽  
Snow Transport

A physically based numerical model of drifting and blowing snow in three-dimensional terrain is developed. The model includes snow transport by saltation and suspension. As an example, a numerical simulation for an Alpine ridge is presented and compared with field measurements.

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