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Heat Transfer Research
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ISSN Druckformat: 1064-2285
ISSN Online: 2162-6561

Volumes:
Volumen 50, 2019 Volumen 49, 2018 Volumen 48, 2017 Volumen 47, 2016 Volumen 46, 2015 Volumen 45, 2014 Volumen 44, 2013 Volumen 43, 2012 Volumen 42, 2011 Volumen 41, 2010 Volumen 40, 2009 Volumen 39, 2008 Volumen 38, 2007 Volumen 37, 2006 Volumen 36, 2005 Volumen 35, 2004 Volumen 34, 2003 Volumen 33, 2002 Volumen 32, 2001 Volumen 31, 2000 Volumen 30, 1999 Volumen 29, 1998 Volumen 28, 1997

Heat Transfer Research

DOI: 10.1615/HeatTransRes.v38.i5.60
pages 449-460

Study of Special Features of Development and Collapse of Vapor Film on Hemispherical Surfaces

V. S. Grigoriev
Institute of High Temperatures, Russian Academy of Sciences, Moscow, Russia
Vyacheslav G. Zhilin
Incorporated Institute of High Temperatures (IIHI) of the Russian Academy of Science, 13/19 Igorskaya str., Moscow, Russia
Yuri Albertovich Zeigarnik
Joint Institute for High Temperatures, Russian Academy of Sciences, str. Izhorskaya 13, bld. 2, Moscow, 125412, Russia
Yurii P. Ivochkin
Moscow Power Engineering Institute; and Joint Institute for High Temperatures of the Russian Academy of Sciences, Moscow, Russia
K. G. Kubrikov
Institute of High Temperatures, Russian Academy of Sciences, Moscow, Russia

ABSTRAKT

Local processes, taking place during a change of the boiling regime on a hot hemispherical surface, have been studied. The experiments have been performed at atmospheric pressure and the initial temperatures of the heated surface and the cooling water equal to 600−1000 K and 288−368 K, respectively. Hemispheres made of stainless steel and copper were used in the experiments. It has been established that the process of film collapse is extremely diversified and greatly depends on the state and thermophysical properties of the surface. It includes both a smooth change of film boiling and an explosive collapse of the vapor film with discharge of jets. The latter regime was observed only on oxide-coated surfaces. Oxidic film thicknesses have been experimentally evaluated. It has been demonstrated that, at an explosive collapse of the vapor film, the rate of cooling of the hemisphere amounted to ∼300 deg/sec; at that, the heat flux density exceeded 10 W/m2 . The fluctuation behavior of the volume of hemispherical vapor cavity has been found. The boundaries of its existence and variation ranges of characteristic parameters have been determined.


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