Inscrição na biblioteca: Guest
Portal Digital Begell Biblioteca digital da Begell eBooks Diários Referências e Anais Coleções de pesquisa
Atomization and Sprays
Fator do impacto: 1.262 FI de cinco anos: 1.518 SJR: 0.814 SNIP: 1.18 CiteScore™: 1.6

ISSN Imprimir: 1044-5110
ISSN On-line: 1936-2684

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

Atomization and Sprays

DOI: 10.1615/AtomizSpr.v15.i1.50
pages 81-102

EFFECT OF OXIDATION ON THE BREAKUP AND MONOSIZED DROPLET GENERATION OF THE MOLTEN METAL JET

Wei-Hsiang Lai
Institute of Aeronautics and Astronautics, National Cheng Kung University, Tainan, Taiwan, 70101, Republic of China
Chia-Chin Chen
National Center for High-Performance Computing, ROC

RESUMO

The objective of this study is to determine how breakup and monosized droplet generation of a molten metal (tin-lead, Sn63-Pb37) jet is affected by oxygen concentration. The major experimental equipment is the monosized droplet generator, which breaks up a laminar stream of liquid metal jet to produce monodispersed droplets by forced vibration generated from a piezoelectric disk within the proper frequency range. The results show that high oxygen concentration retards the breakup process of the molten metal jet, and the "critical oxygen concentration" is about 910 ppm at 1 atm and 350°C, which will result in sudden breakup failure. The molten metal jet can be further divided into three regimes, according to the effect of oxygen concentration, i.e., a "breakup regime," an "incomplete breakup regime," and a "breakup failure regime. "As long as a monosized droplet stream is formed, the breakup lengths of jets with different oxygen concentrations are almost the same, even when oxide islands appear. The behavior of the excited liquid metal jet still conforms to Rayleigh's theory, i.e., λmin = πD, and the working frequencies are limited within the range πD < λ < 2λopt, both when surface tension is up to 500 × 10-3 N/m, and when oxide islands appear, i.e., in both the breakup and incomplete breakup regimes. However, in the breakup failure regime, Rayleigh's theory is not applicable, andeven Wallace's surface tension reduction theory [12] cannot explain this reaction. It must be explained by integrating the combined research models of Haj-Hariri and Poulikakos [13] and Artem'ev and Kochetov [14], i.e., the oxide film islands grow and join until reaching high surface flexural rigidity at the critical oxygen concentration, which will suppress the capillary instability andresult in a sudden failure of the breakup process.


Articles with similar content:

FORMATION OF MICROSTRUCTURES AND OXIDES ON STRUCTURAL STEEL BY NANOSECOND LASER IRRADIATION
High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes, Vol.18, 2014, issue 3
C. Lupulescu, A. N. Chumakov, M. Mitric, B. Gakovic, Irina S. Nikonchuk, Suzana Petrovic
Correlation Between Solar Wind Energy and Non-Tidal Variations of Earth Rotation Velocity
Telecommunications and Radio Engineering, Vol.53, 1999, issue 9-10
I. G. Zakharov
THERMODYNAMICS OF SURFACE GENERATION IN THE BREAKAGE PROCESS OF FLUIDS
Atomization and Sprays, Vol.19, 2009, issue 7
Yoram Zimmels, Leonid Fel
EVAPORATION RATES OF AGRICULTURAL SPRAY MATERIAL AT LOW RELATIVE WIND SPEEDS
Atomization and Sprays, Vol.8, 1998, issue 4
Milton E. Teske, Christopher M. Riley, Clarence G. Hermansky
BREAKUP MECHANISMS AND DRAG COEFFICIENTS OF HIGH-SPEED VAPORIZING LIQUID DROPS
Atomization and Sprays, Vol.6, 1996, issue 3
Rolf D. Reitz, Z. Liu, S. S. Hwang