variavel0=Cleyton Senior Stampa - cleytonstampa@aol.com Pontifícia Universidade Católica do Rio de Janeiro Angela Ourivio Nieckele - nieckele@mec.puc-rio.br Pontifícia Universidade Católica do Rio de Janeiro Sérgio Braga - Leal Pontifícia Universidade Católica do Rio de Janeiro Abstract. A numerical study about the growth of ice layer outside a vertical tube is presented. The physical model adopted considers a vertical annulus, in which the outer vertical wall determines the maximum border for the ice layer growth under the conditions established in the present study. One has assumed the whole annular region as being thermally insulated, except for the outer surface of the tube, where one has prescribed a uniform temperature. The aim of the present study is to provide helpful information to control the growth of ice layers in area-constrained, ice-on-pipe storage tanks. The problem has been solved, twodimensionality, utilizing a model based on the finite volume method. The results are showed as buoyancy-driven flow structure at specific times through streamlines and isotherms, heat transfer on the outer surface of the vertical tube and removal of the heat stored inside the annular region. Keywords. Ice formation, cylindrical geometry, vertical tube.