Boiling Mass Transfer Rate Model Reference

The Boiling Mass Transfer Rate model is used to model the rate of bulk boiling or condensation between phases for a Continuous-Dispersed phase interaction.

The bulk boiling model assumes that the phase temperatures are not in equilibrium, except at the interface where they are both equal to the saturation temperature. Simcenter STAR-CCM+ can solve for bulk boiling or condensation at a rate comparable to flow time-scales.

Table 1. Boiling Mass Transfer Rate Model Reference
Theory See Bulk Boiling.
Provided By [phase interaction] > Models > Interphase Mass Transfer Rate
Example Node Path [phase interaction] > Models > Boiling Mass Transfer Rate
Requires
Physics continuum selections:
  • Material: Multiphase
  • Multiphase Model: Eulerian Multiphase (EMP) (Automatically activates: Multiphase Interaction, Gradients)
  • Optional Models: Phase Coupled Fluid Energy

A liquid continuous phase and a gas dispersed phase that is the vapor of the liquid. For each phase:

  • Material: Gas, Liquid, Multi-Component Gas, or Multi-Component Liquid
  • Energy: Segregated Fluid Temperature or Segregated Fluid Enthalpy

A Continuous-Dispersed Topology phase interaction is required.

Phase interaction selections:
  • Optional Models: Interphase Mass Transfer
  • Interphase Mass Transfer Rate: Boiling Mass Transfer Rate
Properties Key property: Relaxation Factor

See Boiling Mass Transfer Rate Properties.

Activates Model Controls

Continuous Phase Nusselt Number

Dispersed Phase Nusselt Number

See Nusselt Number Properties.

Interface Temperature

See Interface Temperature Properties.

Field Functions See Field Functions.

Boiling Mass Transfer Rate Properties

Relaxation Factor
Adjusts the model sensitivity. Reduce it to improve convergence.

Interface Temperature Properties

The interface temperature is often defined as a constant saturation temperature for a particular system pressure. In Simcenter STAR-CCM+, a field function can optionally be used for the interface temperature, so that depth through the interface layer can be accounted for, or overpressure due to surface tension in micron-sized bubbles.

Method
The method to use in specifying the interface temperature Tij in Eqn. (2064) and Eqn. (2065).
  • Constant
  • Field Function

Field Functions

Bubble Induced Quenching Heat Transfer Coefficient of [phase interaction]
Bubble Induced Quenching Temperature Factor of [phase interaction]
Sauter Mean Diameter of [dispersed phase]
Wall Dryout Area Fraction of [phase interaction]
Wall Interphase Mass Flux of [phase interaction]