Suscripción a Biblioteca: Guest
Portal Digitalde Biblioteca Digital eLibros Revistas Referencias y Libros de Ponencias Colecciones
Atomization and Sprays
Factor de Impacto: 1.262 Factor de Impacto de 5 años: 1.518 SJR: 0.814 SNIP: 1.18 CiteScore™: 1.6

ISSN Imprimir: 1044-5110
ISSN En Línea: 1936-2684

Volumes:
Volumen 29, 2019 Volumen 28, 2018 Volumen 27, 2017 Volumen 26, 2016 Volumen 25, 2015 Volumen 24, 2014 Volumen 23, 2013 Volumen 22, 2012 Volumen 21, 2011 Volumen 20, 2010 Volumen 19, 2009 Volumen 18, 2008 Volumen 17, 2007 Volumen 16, 2006 Volumen 15, 2005 Volumen 14, 2004 Volumen 13, 2003 Volumen 12, 2002 Volumen 11, 2001 Volumen 10, 2000 Volumen 9, 1999 Volumen 8, 1998 Volumen 7, 1997 Volumen 6, 1996 Volumen 5, 1995 Volumen 4, 1994 Volumen 3, 1993 Volumen 2, 1992 Volumen 1, 1991

Atomization and Sprays

DOI: 10.1615/AtomizSpr.v15.i2.40
pages 169-180

ATOMIZATION OF VISCOUS MELTS

H. Lohner
Department of Chemical Engineering, University of Bremen, Bremen, Germany
C. Czisch
University Bremen, Chemical Engineering Departmen, Badgasteiner Str. 3 D-28359 Bremen, Germany
P. Schreckenberg
Department of Chemical Engineering, University of Bremen, Bremen, Germany
Udo Fritsching
Department of Particles and Process Engineering, University of Bremen; Foundation Institute of Materials Science, Badgasteiner Str. 3, D-28359 Bremen, Germany
Klaus Bauckhage
Chemical Engineering Department, University of Bremen, Bremen, Germany

SINOPSIS

Specific melt types have high viscosity and comparably low surface tension. Therefore, conventional twin-fluid atomization of these viscous melts for powder production often results not in spherical particles but in a great amount of fiber material. In this investigation, viscous mineral melts are atomized in a pilot plant by means of hot gases for spherical particle granulation. Experimental results show that an almost fiber-free product (97% spherical powder) can be obtained. Usually, the atomization process is controlled by the gas pressure only (here before the expansion in the atomizer nozzle). For constant atomization pressure the mass median diameter of the powder yield decreases with increasing atomization gas temperature.
Numerical simulations of the gas flow field in the atomizer vicinity support the analysis of the melt fragmentation process by obtaining the gas temperature distribution and the gas flow conditions within the atomization process. Simulations for different atomizer nozzle designs and several operating conditions have been realized. From the discussion of the experimental results together with the results of the simulations, the relevant shear process between the melt jet and the atomization gas, characterized by the Reynolds number, can be determined as the main driving mechanism of the atomization and spheroidization process.