# surface injection

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 June 11, 2015, 05:42 surface injection #1 New Member   Join Date: Jan 2015 Posts: 5 Rep Power: 4 Hello everyone. I am trying to inject n-heptane to cylinder filled with air. I am using surface injection. Diameter of the surface is 0.3 mm. The time of injection is 2 ms. And the total mass of n-heptane that should be injected is 0.0306 g. Density of n-heptan is 684 kg/m3. First I calculated total flow rate as 0.0306g/2ms = 0,015kg/s Then velocity magnitude using: total flow rate = n-heptan density * surface area * velocity magnitude. Is this correct because v=300 m/s? My surface has 57 cells so in one time step 57 particles will be injected. Diameter of particle is 1e-5 m. Let's say that Start and stop time of injection is 0 and 0.002 s (injection duration 2 ms) and time step size = 0.0001. So what will be mass injected in one step size (0.0001s) ? - 57* particle volume * n-heptane density? or it depends on total flow or step size ? Do I have to select "Scale flow rate by face area" ? Thank you all for help. Maciej Last edited by maczaj; June 11, 2015 at 07:04.

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