Moisture Boiling Model Reference

The Moisture Boiling model simulates the effect of the latent heat of vaporization of a liquid phase that is contained in a porous solid, when that solid is heated up to temperatures that exceed the boiling temperature of the liquid. The latent heat of vaporization can become a significant heat sink.

This model computes the boiling of a liquid (moisture) within a solid material. The model considers only energy transport – it does not simulate the evaporated gas phase and distribution. However, this model does calculate distribution and volume fraction of moisture within the solid.

The moisture in the solid does not influence the material properties of the solid such as conductivity or density. The boiling process influences the temperature distribution within the solid. (Boiling is an isothermal process, so the temperature remains constant.)

Table 1. Moisture Boiling Model Reference
Theory See Moisture Boiling.
Provided By [physics continuum] > Models > Optional Models
Example Node Path Continua > Physics 1 > Models > Moisture Boiling
Requires
  • Material: Solid or Multi-Component Solid
  • Optional Models: Segregated Solid Energy or Coupled Solid Energy
  • Optional Models: Moisture Boiling
Properties Key properties are: Density, Latent Heat, Boiling Temperature.

See Moisture Boiling Model Properties.

Activates Initial Conditions

Moisture Volume Fraction

See Initial Conditions.

Field Functions

Moisture Volume Fraction

See Field Functions.

Moisture Boiling Model Properties

Density
The density of the moisture.
Latent Heat
The latent heat of vaporization of the moisture.
Boiling Temperature
The boiling temperature of the moisture.

The temperature value has the following effects:

  • When the initial temperature is greater than the boiling temperature, the phase change (boiling) of moisture results in a temperature decrease down to boiling temperature. This process requires the volume fraction of moisture to exceed zero.
  • When the initial temperature is less than boiling temperature, and if the cell temperature increases due to a net heat flux into the cell, the temperature first increases up to the boiling temperature. Heat is consumed to vaporize moisture isothermally at the boiling temperature. When the moisture volume fraction reaches zero, the temperature increases further.

Initial Conditions

Moisture Volume Fraction
The initial fraction of volume that the moisture represents.

Field Functions

Moisture Volume Fraction
The fraction of volume that the moisture represents.