General
Home / Examples / Fluid Analysis [Bernoulli] / Example 11: Humidifier
Concentration of vapor coming from the humidifier is analyzed.
Steady-state mode of the fluid analysis and transient mode of the diffusion analysis are applied.
Unless specified in the list below, the default conditions are applied.
Results will vary depending on Femtet version and the PC environment.
Item |
Settings |
Analysis Space |
3D |
Model Unit |
m |
Item |
Tab |
Settings |
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Solver |
Solver |
Fluid analysis [Bernoulli] |
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Analysis Type |
Fluid Analysis |
Steady-state Analysis |
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Timestep |
Transient Analysis |
Timestep: Specify
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Diffusion Analysis |
Fluid Analysis Diffusion Analysis Setting |
Select Execute diffusion analysis
Analysis type: Transient analysis
Type and unit of diffusion quantity: Mole fraction [%] Ambient Value: 30[%] Initial Value: 30 [%] |
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Meshing Setup |
Mesh |
General Mesh Size: 0.05 [m] |
The air domain is shown as below. The air and the saturated vapor(Mole fraction: 100%) flow in from the tip of the humidifier (Inlet).
Body Number/Type |
Body Attribute Name |
Material Name |
6/Solid |
Air |
000_Air * |
* Available from the material DB
Boundary Condition Name/Topology |
Tab |
Boundary Condition Type |
Settings |
Inlet/Face |
Fluid |
Inlet |
Specify flow velocity 2 [m/s]
Diffusion Analysis Setting
Value of diffusion quantity: Direct entry 100 [%]
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Outlet/Face |
Fluid |
Inlet/Outlet |
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The flow velocity and the streamlines at the last step (10 [s]) are shown in the figure below.
Isosurface contours of the mole fraction at times 2, 5, and 10 [s] are shown below.
You can observe the isosurface of humidity of 35% is spreading upward over time.
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Isosurface Contour |
Time: 2 [s] |
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Time: 5 [s] |
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Time: 10 [s] |
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