L_in 1[mm] "Inlet tube length"
a_in 0.5[mm] "Inlet tube radius"
S_in pi*a_in^2 "Inlet tube cross section area"
L_rt 1.19[mm] "Receiver tube length"
a_rt 0.725[mm] "Receiver tube diameter"
S_rt pi*a_rt^2 "Receiver tube cross section area"