## Description

Heat can be generated by the interface friction, when a fluid moves through a porous solid. This friction term can be assigned to the fluid phase, the solid phase or neglected completely for testing purposes. The keyword #INTERPHASE_FRICTION enables the switches mentioned above. This parameter is used in the heat transfer process such as local thermal non-equilibrium and gas-solid reactions.

## Parameters

With the parameter ‘SOLID’ and ‘FLUID’, the friction term will be assigned to the solid phase (which is the case of the example given below) or the fluid phase, respectively. With the parameter ‘NONE’, the interphase friction will be neglected completely.

## Examples

### friction

#MEDIUM_PROPERTIES
. . .
\$INTERPHASE_FRICTION
SOLID
. . . .
#STOP