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step function mass flux
Posted Mar 18, 2016, 6:12 a.m. EDT 1 Reply
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Hello,
I am studying the evaporation of a sessile droplet. I need to use a step function to increase the mass transfer coefficient from 0 to a specific value and I am not sure how I can do it. Should I add a ramp for the time as well?
Can anyone help me with this?
Best wishes,
Mercedes
I am studying the evaporation of a sessile droplet. I need to use a step function to increase the mass transfer coefficient from 0 to a specific value and I am not sure how I can do it. Should I add a ramp for the time as well?
Can anyone help me with this?
Best wishes,
Mercedes
1 Reply Last Post Mar 18, 2016, 1:47 p.m. EDT
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Posted:
9 years ago
Hi
You may add a ramp function by going to:
Definitions-->Functions-->Ramp
Then go to the mass flux setting and type:
flux1+(flux2-flux1)*rm1(t)
For instance, if you want your flux to start from 1e-6 and ends to 1e-3:
1e-6+(1e-3-1e-6)*rm1(t)
Or mass flux from zero to 1e-3:
0+(1e-3-0)*rm1(t)
In the ramp function setting, you can change the time where the function starts. For example, if you want the droplet to start evaporating at t=2, you should set the "location" to 2.
Hope this helps.
You may add a ramp function by going to:
Definitions-->Functions-->Ramp
Then go to the mass flux setting and type:
flux1+(flux2-flux1)*rm1(t)
For instance, if you want your flux to start from 1e-6 and ends to 1e-3:
1e-6+(1e-3-1e-6)*rm1(t)
Or mass flux from zero to 1e-3:
0+(1e-3-0)*rm1(t)
In the ramp function setting, you can change the time where the function starts. For example, if you want the droplet to start evaporating at t=2, you should set the "location" to 2.
Hope this helps.