Particle Properties
Use the Particle Properties node to specify the particle size, density, charge number, and particle velocity based on whether a Newtonian formulation or massless formulation is selected.
Particle Properties
This section is shown when Newtonian or Newtonian, first order is selected as the Formulation for the physics interface. If Uniform size is selected from the Particle size distribution list in the in the physics interface Additional Variables section, select the Particle property specification: Specify particle density and diameter (the default), Specify particle mass and density, or Specify particle mass and diameter. Then enter the applicable values or expressions for the following:
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Particle density ρp (SI unit: kg/m3). The default is 2,200 kg/m3.
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Particle diameter dp (SI unit: m). The default is 1 μm.
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Particle mass mp (SI unit kg). The default is 1 mg.
If Specify particle diameter or Specify particle mass is selected from the Particle size distribution list, just enter a value or expression for the Particle density. Then the initial particle mass or diameter is controlled by the release features.
Select an option from the Particle type list: Solid particles (the default) or Liquid droplets/bubbles. If Liquid droplets/bubbles is selected, enter values or expressions for the following:
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Particle dynamic viscosity μp (SI unit: Pa·s) the default is 1 mPa·s.
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Particle surface tension σp (SI unit: N/m). The default is 0.0729 N/m.
Liquid droplets/bubbles must be selected for at least one species in the model in order to use the Droplet Breakup and Nozzle features.
Charge Number
Enter a value or expression for the Charge number Z (dimensionless). The default is 0. The particle charge is the product of the charge number with the elementary charge e.
Particle Velocity
This section is shown when Massless is selected as the Formulation for the physics interface. Enter a vector for the Particle velocity v (SI unit: m/s) based on space dimension. The Massless formulation means that the particles follow streamlines of the particle velocity expression.
Thermal Properties
This section is shown when the Compute particle temperature check box is selected in the physics interface Additional Variables section. Enter a value or expression for the Particle specific heat capacity Cp (SI unit: J/(kg·K)). The default is 2,200 J/(kg·K). Then enter a value or expression for the Particle latent heat hp (SI unit: J/kg). The default value is 42,000 J/kg.
Accretion Rate
This section is shown when Specify particle diameter or Specify particle mass is selected from the Particle size distribution list in the physics interface Additional Variables section. Enter a value for the Accretion rate R (SI unit: kg/s). The default is 0. The Accretion rate is the time derivative of the particle mass. If this value is positive, particles will grow continuously over time after they are released.