Can a transient state be set for the pumping speed of the pump?

General discussion
1

Hello!Marton teacher
I would like to know that in addition to setting the transient air output rate, can I also set the pumping speed to drop to 0 within a certain period of time?

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Why does the pumping speed become like this after entering the defined transient?

2

Hello Qi,

Yes, it’s possible.

  • Write a parameter name, for example “pump_t” as sticking factor on the facet representing the pump
  • Define the time-dependent parameter “pump_t” in parameter editor
  • Note that you can only assign a time-dependent sticking, not time-dependent outgassing, but they are convertible:
    Pumping_speed [l/s] = sticking * A[cm2] * 11.77[l/s/cm2]
    for room-temperature nitrogen, or
    Pumping_speed[m3/s] = sticking * 0.25 * molecule_speed[m/s] * A[m2]
    for other gases. A is facet area, molecule_speed is average molecule speed.

We have used this method before to simulate turning on a pump, it looks kind of cool:

Good luck and let me know if you have questions!