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PROVIDA University of Surrey Prof. Sai Gu, Zihang Zhu 7/JUN/2016 Volcanic ash impingement.

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Presentation on theme: "PROVIDA University of Surrey Prof. Sai Gu, Zihang Zhu 7/JUN/2016 Volcanic ash impingement."— Presentation transcript:

1 PROVIDA University of Surrey Prof. Sai Gu, Zihang Zhu 7/JUN/2016 Volcanic ash impingement

2 Content Recap of Previous work Improvement of VA injection model Modeling high viscosity droplet impact Conclusion and Next step

3 Recap of previous work Modeling 2D in-flight VA particle and phase transition outlet PS gas inlet Wall of tube Chamber environment

4 Recap of previous work Modeling 2D in-flight VA particle and phase transition

5 Recap of previous work Modeling 2D in-flight VA particle and phase transition

6 Recap of previous work Single particle impact (VOF) Viscosity 1 Pas (2 days)

7 Recap of previous work Single particle impact (CEL) Viscosity 1 Pas (~ 1 day)

8 Recap of previous work Temperature and composition dependent viscosity* log η (Pa s) Temperature (°C) *Giordano D, Russell JK, & Dingwell DB. Silicate Melt Viscosity Calculator. 2008.

9 Recap of previous work Liquid spray/Nozzle test Atomizer Water pump Air cylinder Mean: 22.814 μm Mean: 22.623 μm

10 Recap of previous work Liquid spray/Nozzle test

11 Recap of previous work Problems 1.The 3D swirl effect of the VPS is not taken into consideration. This makes the temperature field only at the centre of the plasma jet matches the experiment data. 2.The CEL, VOF particle impact model is not suitable for the high-viscosity flow due to high demand of computational resources.

12 Improvement of VA injection model 3D model

13 Improvement of VA injection model CFD vs Experiment data (Temperature)

14 Improvement of VA injection model CFD vs Experiment data (Velocity)

15 Improvement of VA injection model CFD vs Experiment data (Velocity with substrate)

16 Improvement of VA injection model DPM model

17 Improvement of VA injection model Striking rate and contact angle Large particles -Normal impact -Oblique impact ( small contact angle) Small particles -Bypass the substrate -Oblique impact (large contact angle)

18 Improvement of VA injection model Phase transition and in-flight particle heat transfer

19 Improvement of VA injection model Phase transition and in-flight particle heat transfer

20 Modeling high viscosity droplet impact Temperature and composition dependent viscosity* log η (Pa s) Temperature (°C) *Giordano D, Russell JK, & Dingwell DB. Silicate Melt Viscosity Calculator. 2008.

21 Modeling high viscosity droplet impact Particle based SPH method (smoothed particle hydrodynamics) Eulerian Mesh (VOF) High computational resource consumption Lagrangian Particles (SPH) By using different discretization/ interpolation method, SPH is faster then traditional VOF method Have stability issue

22 Modeling high viscosity droplet impact SPH method (algorithm - density) Any function A(r) could be represented by If it’s interpolated by particles of mass m and density ρ Where W is called the kernel function, h is the smoothed radius. For example, the density ρ at each particle could be represented by

23 Modeling high viscosity droplet impact SPH method (algorithm -EOM) There fore the N-S governing equation is then: The surface of the substrate is set with damping and elasticity.

24 Modeling high viscosity droplet impact SPH method (algorithm –heat transfer) The heat transfer equation could be represented: Where Ghost particles was generated to simulate only the heat transfer between the substrate and droplet. They will not have any influence on the equation of motion.

25 Modeling high viscosity droplet impact Density stability

26 Modeling high viscosity droplet impact Viscosity 1 Pas and no solidification

27 Modeling high viscosity droplet impact Heat transfer

28 Modeling high viscosity droplet impact Viscosity 1 Pas velocity 10 m/s normal impact Spreading Factor 1.5

29 Modeling high viscosity droplet impact Viscosity 10 Pas velocity 10 m/s normal impact Spreading Factor 1.1

30 Modeling high viscosity droplet impact Viscosity 50 Pas velocity 10 m/s normal impact Spreading Factor 1.05

31 Modeling high viscosity droplet impact Viscosity 50 Pas velocity 20 m/s oblique impact (30°) Spreading Factor 1.1

32 Modeling high viscosity droplet impact Viscosity 50 Pas velocity 20 m/s oblique impact (45°) Spreading Factor 1.5

33 Modeling high viscosity droplet impact Viscosity 50 Pas velocity 20 m/s oblique impact (60°) Spreading Factor 1.7

34 Modeling high viscosity droplet impact

35 Conclusion and Next step Viscoelastic (VE) model could be more proper in case of simulating the particles. The SPH EOM could be switched to SPH VE constitutive equations.

36 Thank you !

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