Inscrição na biblioteca: Guest
Portal Digital Begell Biblioteca digital da Begell eBooks Diários Referências e Anais Coleções de pesquisa
Heat Transfer Research
Fator do impacto: 0.404 FI de cinco anos: 0.8 SJR: 0.264 SNIP: 0.504 CiteScore™: 0.88

ISSN Imprimir: 1064-2285
ISSN On-line: 2162-6561

Volume 51, 2020 Volume 50, 2019 Volume 49, 2018 Volume 48, 2017 Volume 47, 2016 Volume 46, 2015 Volume 45, 2014 Volume 44, 2013 Volume 43, 2012 Volume 42, 2011 Volume 41, 2010 Volume 40, 2009 Volume 39, 2008 Volume 38, 2007 Volume 37, 2006 Volume 36, 2005 Volume 35, 2004 Volume 34, 2003 Volume 33, 2002 Volume 32, 2001 Volume 31, 2000 Volume 30, 1999 Volume 29, 1998 Volume 28, 1997

Heat Transfer Research

DOI: 10.1615/HeatTransRes.v41.i4.20
pages 369-387

Heat Transfer in Boiling of a Moving Liquid in a Microchannel

Vladimir V. Kuznetsov
The Kutateladze Institute of Thermophysics SB RAS, 1 Lavrentieva Ave., Novosibirsk, 630090, Russia; Novosibirsk State University, 2 Pirogova Str., Novosibirsk 630090, Russia
Alisher S. Shamirzaev
The Kutateladze Institute of Thermophysics SB RAS, 1 Lavrentieva Ave., Novosibirsk, 630090, Russia


Boiling of a moving liquid in channels whose transverse dimension is smaller than the capillary constant is characterized by the determining influence of capillary forces and of the constraint effects on the flow regime and heat transfer. In the present work, we have studied experimentally heat transfer in boiling of R318C and R21 coolants in an annular and rectangular channels with a clearance of 0.9 and 1.6 × 6.3 mm, respectively, in the range of mass velocities from 10 to 800 kg/m2· sec, at heat fluxes of up to 90 kW/m2 , as well as heat transfer in boiling of water in a microchannel measuring 0.6 × 2 mm. The experiments were carried out at initial subcooling and at a fixed initial vapor content at the channel inlet. For R318C coolant and water under the conditions considered, the bubble boiling makes a determining contribution to the general heat transfer, whereas for the R21 coolant the boiling and forced convection make a commensurable contribution. The data on the structure of flow and local heat transfer coefficients, also in the regime of burnout heat transfer, the distribution of heat transfer coefficient over the perimeter of the rectangular channel, the space and time dispersions of the local heat transfer coefficient were obtained.

Palavras-chave: boiling, capillary force, coolant