Annular condensation heat transfer in a microgravity environment

The Nusselt analysis for laminar film condensation is extended to cocurrent vapor flow inside an annulus in a microgravity environment. Numerical results are presented for both symmetric (equal inner and outer wall temperatures) and asymmetric (different inner and outer wall temperatures) cooling cases. In both cases the vapor shear is the only mechanism for condensate removal. It is shown that vapor condenses much faster in an annulus than in a conventional circular pipe.