Surprising effects of combined vapour and liquid mass transfer resistances when condensing a mixture outside tube banks
Artikel i vetenskaplig tidskrift, 2005

Detailed calculations are carried out for condensation of a binary zeotropic mixture outside a tube bank to investigate combined effects of mass transfer resistances in the liquid and vapour phases. The question is how a change in mass transfer resistance in the vapour phase can influence the heat flux. The surprising result is that a decrease in resistance in the vapour phase by reducing the tube pitch, and thus increasing the vapour velocity, reduces the heat flux between 20% and 50% for the conditions studied. This is due to a combination of mass transfer resistance, depletion of the heavy volatile component, and a reduction of the phase interface temperature.


Mass transfer resistance


Tube bundle


Tord Karlsson

Industriella energisystem och -tekniker

Lennart Vamling

Industriella energisystem och -tekniker

International Journal of Heat and Mass Transfer

0017-9310 (ISSN)

Vol. 48 403-412


Annan naturresursteknik