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Centrifuge tube Numerical simulation of solid-liquid two-phase flow - tube centrifuge, two-phase fl by zyzy wang
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Centrifuge tube Numerical simulation of solid-liquid two-phase flow - tube centrifuge, two-phase fl by ZYZY WANG
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| Article Posted: 06/30/2010 |
| Article Views: 129 |
| Articles Written: 2301 - MORE ARTICLES FROM THIS AUTHOR |
| Word Count: 970 |
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Centrifuge tube Numerical simulation of solid-liquid two-phase flow - tube centrifuge, two-phase fl |
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Business,Business News,Business Opportunities
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Abstract: A brief introduction tube Centrifuge The main Technology Conditions, inadequate and FLUENT Software ; In a simplified basis. Starting from a single-phase continuity equation was established within the centrifuge tube solid, liquid two-phase flow model, by calculating the mesh and boundary conditions, two-dimensional numerical simulation using FLUENT a two-phase flow within the machine and the separation over time. Intuitive machine obtained on different sections and the separation velocity cloud particle size distribution. Simulation results match the machine to run rule. To lay a foundation for further study.
1 Introduction Tubular centrifuge is a high speed, high separation factor of the separator. Usually applied to less than 1% of solid content, solid particles less than 5p, m and the density difference between solid and liquid suspension small clarification; also applies to the light liquid and heavy liquid density difference is small and highly dispersed emulsion separation. Its speed up to 1000o 1 30 000 dmin, the separation factor of up to 10 00o 1 30 000, in various industries is widely used. For example: oil purification, oral liquid purification, blood products, biological products, beverage industry, pharmaceutical industry, oil industry, the purification of coal tar, etc..
Tube separator main drawback is the intermittent operation. Drum volume small. To remove sediment down frequently. Therefore, through strengthening the separation of theory and research to strengthen the process of centrifugal separation tube centrifuge separation. To develop large-scale centrifuge. But the theory can not people see the visual status of fluid flow within the drum. So this paper, computational fluid dynamics (referred to as CFD) numerical simulation, so that results visualization, visualization. Thus guiding the user to optimize the design of centrifuge tube.
2 Physical and mathematical model 2.1 The proposed physical model
When the centrifuge tube in the tubular drum driven by the spindle rotation speed solid-liquid slurry into the liquid from the bearing into the bottom of the spray nozzle inside the drum. Suspension into the drum. Generated in the drum rotation speed under the action of the centrifugal force field. Suspension layered production. Solid precipitation in the lumen of the outer drum. As the import of Speed. Upward flow of liquid to the centrifuge at the top. Out through mouth fluid, small amounts of solid precipitation in the inner wall of the drum. To facilitate the calculation and discussion, to simplify the flow field analysis for the two-dimensional axisymmetric model.
2.2 centrifuge mathematical model of two-phase flow field
For multiphase flow analysis. Each phase can be handled as a target. Not consider the role of white. Allow multi-phase movement at different speeds and cross-cutting. Suppose there are n-phase mixture, in which the dispersed phase particles, and its physical with the subscript P said continuous phase is liquid, the physical quantity with subscript c said. Based on the continuous phase and dispersed phase of the mixture can be drawn multiphase flow continuity equation and momentum equation. Based k-phase volume fraction:
can be seen from Figure 3:
(1) the mixture into the drum diameter just large changes to the speed that centrifugal force has played a role here, which will help solid-liquid separation. After the radial velocity over a period of volatility is negative and not. Show that the drum in the liquid gently to the axis of migration and population outflow from the overflow; in near wall region is positive. Show that the solid particles in the fluid under the action of centrifugal force migration to the drum wall.
(2) two-phase exists in the radial direction of the velocity difference. Therefore carried out with the separation process. Concentrated in the center of liquid, solid-phase distribution in the dark wall, which also shows the existence of the radial velocity difference is the premise of two-phase separation.
4.3 axial velocity Solid phase at different times the cross section x =- 0.51 solid bent along the y-axis of the axial velocity distribution shown in Figure 4 and Figure 5.
From Figure 4 and Figure 5 shows comparison: solid-phase axial velocity distribution and the trends are consistent with tubular centrifuge flow field within the basic law. When the axial velocity is zero at the bottom, with the axial distance increases, the axial speed increases, around y = 0.69 reaches its maximum value, the speed decreases, the axial velocity at the top zero.
4.3 volume of cloud Cloud volume calculated as shown in Figure 6. Figure 6 shows the distribution of phase are: the distribution density of the solid phase at the periphery, the distribution density of the liquid in the center. This is because the fluid rotating with the drum wall, the density of the solid phase suffered a large centrifugal force. Density of the liquid received by the centrifugal force is small, over time, stratified two-phase nature. This result directly reflects the tubular centrifuge separation.
5 Conclusion Figure 6 volume cloud
Using multiphase flow and Reynolds stress model centrifuge tube two-phase flow field in a turbulent two-dimensional numerical simulation. Available the following conclusions:
(1) can be seen clearly through the simulation, two-phase flow into the centrifuge and the centrifugal force. After a certain time after stratification. Liquid gathered in the center. Population outflow from the drainage, solid state devices distributed in the wall.
(2) to simulate the different sections on the radial velocity distribution and solid phase at different times of the axial velocity distribution consistent with the basic law theory. Help with FUIENT software to simulate the flow field within the centrifuge tube flow situation is possible. Can further study.
Key: I am Chinese Manufacturers writer, reports some information about led flashlight wholesale , dynamo led flashlights.
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