[jins9158]

Hello

I have a question while analyzing the kitchen hood airflow.

The details to inquire are as follows.

* The inlet boundary condition velocity value is changed after analysis.
[boundary name is inlet_poor3]


For example, I set 0.1m/s as the inlet condition, but after analyzing the results, it is changed to 0.14m/s.

The fine dust removal efficiency formula is as follows, and the efficiency value changes when the inlet boundary condition is changed. This results in incorrect efficiency values being calculated.


[Efficiency = PM25 mass_out(hood's mass flow) / PM25 mass_in]


I applied a value of 0.1m/s as a boundary condition, why does it change?

Isn't the input value entered into the boundary condition a fixed value?

If anyone knows, please advise.

thank you


* Analysis condition
1. Analysis condition: steady state condition

2. Working fluid: Mixture Gas

3. Buoyancy model: Full buoyancy applied

4. Heat transfer model: Thermal Energy

5. Turbulence model: SST k-w

6. Particle Tracking Method (PTM) applied

7. inlet_poor3 condition
1) Mass and Momentum: normal speed 0.1m/s
2) static temperature: 1500C
3) component: mixure gas (including PM25)

8. outlet condition > 450[cmh]