scholarly journals Application of Magnetic Nano-Immobilized Enzyme in Soybean Oil Degumming: Numerical Simulation in a Liquid-Solid MFB

2021 ◽  
Vol 2021 ◽  
pp. 1-14
Author(s):  
Kuiren Chen ◽  
Tong Wang ◽  
Hong Wang ◽  
Haoyuan Geng ◽  
Jing Du ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Soybean Oil ◽  
Enzymatic Reaction ◽  
Relative Activity ◽  
Iteration Step ◽  
Step Size ◽  
Two Phase ◽  
Crude Soybean Oil ◽  
Simulation Based ◽  
The Stability

Using crude soybean oil (CSO) as fluid and nanomagnetic immobilized phospholipase C (PLC) as fluidizing particles, the Eulerian–Lagrangian fluid-particle two-phase flow model was used to numerically simulate the law of motion of fluidizing particles in the magnetic fluidized bed (MFB). The main parameters were obtained by numerical simulation based on the discrete element method (DEM). The nanomagnetic PLC in the MFB was optimal to the enzymatic reaction by limiting the iteration step size to 3 × 10−5, the boundary condition to 20 × 300 mm, the opening rate to 37.5%, the condition of CSO flow rate to 0.01 m/s, and the magnetic field strength to 0.02T. After 2.0 h of reaction, the amount of residual phosphorus in the oil was 55.73 mg/kg, the content of 1, 2-DAG was 1.42%, and the nanomagnetic enzyme still had 97% relative activity. Hence, these optimal conditions can improve the efficiency and the stability of the nanomagnetic enzymatic reaction.

Study on flow field of gas–solid two-phase pulsed jet

2019 ◽  
Vol 33 (24) ◽  
pp. 1950279
Author(s):  
Xinhua Song ◽  
Xiaojie Li ◽  
Yang Wang ◽  
Honghao Yan
Keyword(s):  
Numerical Simulation ◽  
Flow Field ◽  
Particle Distribution ◽  
Starch Granule ◽  
Injection Pressure ◽  
Two Phase ◽  
Particle Injection ◽  
Pulsed Jet ◽  
Simulation Based ◽  
Simulation Results

In this paper, a computational fluid dynamics–discrete element method (CFD–DEM) coupling method is established to simulate the starch granule injection by coupling CFD and DEM. Then a gas–solid two-phase pulsed jet system is designed to capture the flow field trajectory of particle injection (colored starch with a mean diameter of 10.67 [Formula: see text]m), and the image is processed by color moment and histogram. Finally, the simulation results are compared with the experimental results, and the following conclusions are drawn. The numerical simulation results show that with the increase of injection pressure, the injection height increases gradually. When the injection pressure reaches above 0.4 MPa, the increase of injection height decreases. The experimental images show that the larger the pressure (i.e., the greater the initial velocity), the faster the velocity of particle distribution in the space, and the injection heights with the injection pressures of 0.4 MPa and 0.5 MPa are close, which is consistent with the result from the FLUENT numerical simulation based on CFD–DEM.

Numerical Simulation of the Two-Phase Turbulent Combustion Flow in the Multicomponent Propellant Rocket Engine

2012 ◽  
Vol 452-453 ◽  
pp. 1334-1338
Author(s):  
De Song Liu ◽  
Hong Fu Qiang ◽  
Xue Li Xia ◽  
Guang Wang
Keyword(s):  
Numerical Simulation ◽  
Turbulent Combustion ◽  
Gas Flow ◽  
Rocket Engine ◽  
Two Phase ◽  
Fuel Droplets ◽  
Simulation Based ◽  
Combustion Flow ◽  
Simulation Programme ◽  
Propellant Rocket

The numerical simulation, based on computational fluid dynamics methodology, has been performed to study the two-phase turbulent combustion flow in rocket engine using non-metallized multicomponent propellant. A reduced reaction mechanism is developed for modelling combustion of fuel droplets in the absence of metal. Gas governing equations are two dimensional axisymmetric N-S equations in Eulerian coordinates. The trajectory model is adopted to analyse the droplet-phase including the droplet collision, breakup and evaporation. The gas flow is influenced by the droplets by adding source term to N-S equations. The reliability of the simulation programme is validated by comparing numerical simulation result with engine test data.

scholarly journals Numerical simulation of hydrodynamic loads on starting rocket and submarine

2016 ◽  
pp. 30-35 ◽  
Author(s):  
V. I. Pegov ◽  
I. Yu. Moshkin ◽  
E. S. Merkulov ◽  
A. D. Cheshko
Keyword(s):  
Numerical Simulation ◽  
Phase State ◽  
Control Volume ◽  
Three Dimensional ◽  
Stationary Problem ◽  
Problem Statement ◽  
Two Phase ◽  
Hydrodynamic Loads ◽  
Simulation Based ◽  
Volume Method

The paper proposes a solution to the problem of determining hydrodynamic loads on the rocket and submarine using numerical simulation based on the control volume method in a three-dimensional non-stationary problem statement. We took into consideration contours, rocket and submarine velocity, medium two-phase state (gas liquid), viscosity and gravity. We calculated the start effects on the rocket and submarine for two cases: when the submarine is moving and stationary. The reliability and accuracy of the calculations were confirmed by comparing them with the results of the tests on a model in the hydro tank at JSC Academician V. P. Makeyev State Rocket Centre.

Flow Phenomena in the Riser of a Circulating Fluidized Bed

2012 ◽  
Vol 516-517 ◽  
pp. 906-909
Author(s):  
Sheng Dian Wang ◽  
Xue Yao Wang ◽  
Xiang Xu ◽  
Yun Han Xiao
Keyword(s):  
Numerical Simulation ◽  
Fluidized Bed ◽  
Circulating Fluidized Bed ◽  
Rectangular Cross Section ◽  
Low Cost ◽  
Two Phase ◽  
High Efficient ◽  
Simulation Based ◽  
Flow Phenomena ◽  
Physical And Mathematical Models

Numerical simulation of gas-solid two-phase flows in circulating fluidized bed is proved to be a low-cost and high-efficient method to research the instability essence of flow character. In this work, numerical simulation based on the discrete element (DEM) method is applied to analyze behaviors in a rectangular cross-section fluidized bed. The models of physical and mathematical models are introduced in detail, and the schematic of DEM method also described clearly. It indicates that the DEM method may be used as a powerful tool for the simulation of the gas-solid flow.

The influence of the Stokes and Archimedes forces on the stability of a two-phase flow

2003 ◽  
Vol 3 ◽  
pp. 266-270
Author(s):  
B.H. Khudjuyerov ◽  
I.A. Chuliev
Keyword(s):  
Spectral Method ◽  
Stability Region ◽  
Gas Flow ◽  
Two Phase Flow ◽  
Solid Phase ◽  
Stability Characteristic ◽  
Phase Flow ◽  
Two Phase ◽  
The Stability

The problem of the stability of a two-phase flow is considered. The solution of the stability equations is performed by the spectral method using polynomials of Chebyshev. A decrease in the stability region gas flow with the addition of particles of the solid phase. The analysis influence on the stability characteristic of Stokes and Archimedes forces.

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