Thank you very much for your fast and detailled answer! This will be very helpful!

I wish you a nice day.

Best regards,

Sébastien ]]>

lambda = 1/(N*sigma)

where N is the number density and sigma is the collision cross section. Using N=1.6E17[1/m^3], which I got by inserting a point in the geometry at (0,0,200[mm]), and a rough cross section of sigma=9E-20[m^2], the mean free path comes out to be around 70[m]. For a characteristic length of around 280[mm] (distance between the source and target) I get a Knudsen number of 250, which is well in the molecular flow regime. ]]>

I hope you’re doing well. Could you please tell what temperature you would consider for the Knudsen number calculation in the gold evaporator model? I would choose the gold bath free surface temperature. Is this correct? Many Thanks.

Best regards,

Sébastien