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Journal of Enhanced Heat Transfer
Импакт фактор: 0.562 5-летний Импакт фактор: 0.605 SJR: 0.175 SNIP: 0.361 CiteScore™: 0.33

ISSN Печать: 1065-5131
ISSN Онлайн: 1026-5511

Выпуски:
Том 27, 2020 Том 26, 2019 Том 25, 2018 Том 24, 2017 Том 23, 2016 Том 22, 2015 Том 21, 2014 Том 20, 2013 Том 19, 2012 Том 18, 2011 Том 17, 2010 Том 16, 2009 Том 15, 2008 Том 14, 2007 Том 13, 2006 Том 12, 2005 Том 11, 2004 Том 10, 2003 Том 9, 2002 Том 8, 2001 Том 7, 2000 Том 6, 1999 Том 5, 1998 Том 4, 1997 Том 3, 1996 Том 2, 1995 Том 1, 1994

Journal of Enhanced Heat Transfer

DOI: 10.1615/JEnhHeatTransf.2019030310
pages 101-122

EXPERIMENTAL INVESTIGATION OF THE EFFECT OF DIMENSIONS ON NUCLEATE BOILING HEAT TRANSFER IN STRAIGHT TUNNEL-STRUCTURED BOILING SURFACES

Ali Can Ispir
Istanbul Technical University, Inonu Caddesi Gumussuyu Mah. No: 65 ITU Makina Fakultesi, Istanbul, 34357, Turkey
Seyhan Uygur Onbasioglu
Istanbul Technical University, Inonu Caddesi Gumussuyu Mah. No: 65 ITU Makina Fakultesi, Istanbul, 34357, Turkey

Краткое описание

Pool boiling experiments were carried out to investigate tunnel width, pore, and height size effects on boiling heat transfer and to determine the performance of surfaces in different ranges of heat fluxes by using distilled water under atmospheric conditions. Also, the behavior of nucleation of vapor bubbles was observed. The nine structured surfaces, which have the same fin thickness (2.0 mm) but different tunnel width and height, and pore diameter, were developed for enhancement of boiling heat transfer. Also, a structured surface having 3.0 mm tunnel width without pores was investigated to observe pore effect. In order to investigate tunnel height, four surfaces with the same pore diameter and tunnel width, but various tunnel height values, were also used. In addition, it was considered that pore structures would help for fluid transition along the channels to increase the bubble frequency (nucleation, growing and leaving periods). Although a surface whose tunnel width is 1.0 mm can be considered best due to higher heat transfer area and providing more active nucleation sites, it was observed that vapor bubbles could hardly release throughout the tunnel, especially at high heat fluxes. Even though pore size is very significant for fluid transition during boiling and pores are needed for suction-evaporation operational mode for surface structure, it was observed that pores decrease the active nucleation sites because pore internal surfaces are not suitable places for nucleation.

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