@article{Fukano_1999 author = {T. Fukano and Ryu Egashira and K. Naitoh}, title = {Upward Two-Phase Flow in a Vertical Annular Channel (Effect of Spacer Geometry)}, journal = {Heat Transfer Research}, issn = {1064-2285}, year = {1999}, volume = {30}, number = {4-6}, pages = {411--421} }